/*************************************************************************/
/*  animation.cpp                                                        */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "animation.h"
#include "geometry.h"


bool Animation::_set(const StringName& p_name, const Variant& p_value) {

	String name=p_name;

	if (name=="length")
		set_length(p_value);
	else if (name=="loop")
		set_loop(p_value);
	else if (name=="step")
		set_step(p_value);
	else if (name.begins_with("tracks/")) {

		int track=name.get_slicec('/',1).to_int();
		String what=name.get_slicec('/',2);

		if (tracks.size()==track && what=="type") {

			String type=p_value;

			if (type=="transform") {

				add_track(TYPE_TRANSFORM);
			} else if (type=="value") {

				add_track(TYPE_VALUE);
			} else if (type=="method") {

				add_track(TYPE_METHOD);
			} else {

				return false;
			}

			return true;
		}

		ERR_FAIL_INDEX_V( track, tracks.size(),false );

		if (what=="path")
			track_set_path(track,p_value);
		else if (what=="interp")
			track_set_interpolation_type(track,InterpolationType(p_value.operator int()));
		else if (what == "keys" || what=="key_values") {

			if (track_get_type(track)==TYPE_TRANSFORM) {

				TransformTrack *tt = static_cast<TransformTrack*>(tracks[track]);
				DVector<float> values=p_value;
				int vcount=values.size();

#if 0 // old compatibility hack
				if ((vcount%11) == 0) {


					DVector<float>::Read r = values.read();

					tt->transforms.resize(vcount/11);


					for(int i=0;i<(vcount/11);i++) {


						TKey<TransformKey> &tk=tt->transforms[i];
						const float *ofs=&r[i*11];
						tk.time=ofs[0];

						tk.value.loc.x=ofs[1];
						tk.value.loc.y=ofs[2];
						tk.value.loc.z=ofs[3];

						tk.value.rot.x=ofs[4];
						tk.value.rot.y=ofs[5];
						tk.value.rot.z=ofs[6];
						tk.value.rot.w=ofs[7];

						tk.value.scale.x=ofs[8];
						tk.value.scale.y=ofs[9];
						tk.value.scale.z=ofs[10];


					}
					return true;



				}
#endif
				ERR_FAIL_COND_V(vcount%12,false); // shuld be multiple of 11

				DVector<float>::Read r = values.read();

				tt->transforms.resize(vcount/12);


				for(int i=0;i<(vcount/12);i++) {


					TKey<TransformKey> &tk=tt->transforms[i];
					const float *ofs=&r[i*12];
					tk.time=ofs[0];
					tk.transition=ofs[1];

					tk.value.loc.x=ofs[2];
					tk.value.loc.y=ofs[3];
					tk.value.loc.z=ofs[4];

					tk.value.rot.x=ofs[5];
					tk.value.rot.y=ofs[6];
					tk.value.rot.z=ofs[7];
					tk.value.rot.w=ofs[8];

					tk.value.scale.x=ofs[9];
					tk.value.scale.y=ofs[10];
					tk.value.scale.z=ofs[11];


				}

			} else if (track_get_type(track)==TYPE_VALUE) {

				ValueTrack *vt = static_cast<ValueTrack*>(tracks[track]);
				Dictionary d = p_value;
				ERR_FAIL_COND_V(!d.has("times"),false);
				ERR_FAIL_COND_V(!d.has("values"),false);
				if (d.has("cont"))
					vt->continuous=d["cont"];

				DVector<float> times=d["times"];
				Array values=d["values"];

				ERR_FAIL_COND_V(times.size()!=values.size(),false);

				if (times.size()) {

					int valcount=times.size();

					DVector<float>::Read rt = times.read();

					vt->values.resize(valcount);

					for(int i=0;i<valcount;i++) {

						vt->values[i].time=rt[i];
						vt->values[i].value=values[i];
					}

					if (d.has("transitions")) {

						DVector<float> transitions = d["transitions"];
						ERR_FAIL_COND_V(transitions.size()!=valcount,false);

						DVector<float>::Read rtr = transitions.read();


						for(int i=0;i<valcount;i++) {

							vt->values[i].transition=rtr[i];
						}
					}

				}

				return true;

			} else {

				while(track_get_key_count(track))
					track_remove_key(track,0); //well shouldn't be set anyway

				Dictionary d = p_value;
				ERR_FAIL_COND_V(!d.has("times"),false);
				ERR_FAIL_COND_V(!d.has("values"),false);

				DVector<float> times=d["times"];
				Array values=d["values"];

				ERR_FAIL_COND_V(times.size()!=values.size(),false);

				if (times.size()) {

					int valcount=times.size();

					DVector<float>::Read rt = times.read();

					for(int i=0;i<valcount;i++) {

						track_insert_key(track,rt[i],values[i]);
					}

					if (d.has("transitions")) {

						DVector<float> transitions = d["transitions"];
						ERR_FAIL_COND_V(transitions.size()!=valcount,false);

						DVector<float>::Read rtr = transitions.read();

						for(int i=0;i<valcount;i++) {

							track_set_key_transition(track,i,rtr[i]);
						}
					}

				}


			}
		} else
			return false;
	} else
		return false;

	return true;
}


bool Animation::_get(const StringName& p_name,Variant &r_ret) const {

	String name=p_name;

	if (name=="length")
		r_ret= length;
	else if (name=="loop")
		r_ret= loop;
	else if (name=="step")
		r_ret= step;
	else if (name.begins_with("tracks/")) {

		int track=name.get_slicec('/',1).to_int();
		String what=name.get_slicec('/',2);
		ERR_FAIL_INDEX_V( track, tracks.size(), false );
		if (what=="type") {


			switch (track_get_type(track)) {

				case TYPE_TRANSFORM: r_ret= "transform"; break;
				case TYPE_VALUE: r_ret= "value";break;
				case TYPE_METHOD: r_ret= "method";break;
			}

			return true;

		} else if (what=="path")
			r_ret=track_get_path(track);
		else if (what=="interp")
			r_ret = track_get_interpolation_type(track);
		else if (what=="keys") {

			if (track_get_type(track)==TYPE_TRANSFORM) {

				DVector<real_t> keys;
				int kk=track_get_key_count(track);
				keys.resize(kk*12);

				DVector<real_t>::Write w = keys.write();

				int idx=0;
				for(int i=0;i<track_get_key_count(track);i++) {

					Vector3 loc;
					Quat rot;
					Vector3 scale;
					transform_track_get_key(track,i,&loc,&rot,&scale);

					w[idx++]=track_get_key_time(track,i);
					w[idx++]=track_get_key_transition(track,i);
					w[idx++]=loc.x;
					w[idx++]=loc.y;
					w[idx++]=loc.z;

					w[idx++]=rot.x;
					w[idx++]=rot.y;
					w[idx++]=rot.z;
					w[idx++]=rot.w;

					w[idx++]=scale.x;
					w[idx++]=scale.y;
					w[idx++]=scale.z;
				}

				w = DVector<real_t>::Write();
				r_ret=keys;
				return true;

			} else if (track_get_type(track)==TYPE_VALUE) {


				const ValueTrack *vt = static_cast<const ValueTrack*>(tracks[track]);

				Dictionary d;

				DVector<float> key_times;
				DVector<float> key_transitions;
				Array key_values;

				int kk=vt->values.size();

				key_times.resize(kk);
				key_transitions.resize(kk);
				key_values.resize(kk);

				DVector<float>::Write wti=key_times.write();
				DVector<float>::Write wtr=key_transitions.write();

				int idx=0;

				const TKey<Variant> *vls = vt->values.ptr();

				for(int i=0;i<kk;i++) {

					wti[idx]=vls[i].time;
					wtr[idx]=vls[i].transition;
					key_values[idx]=vls[i].value;
					idx++;
				}

				wti=DVector<float>::Write();
				wtr=DVector<float>::Write();

				d["times"]=key_times;
				d["transitions"]=key_transitions;
				d["values"]=key_values;
				if (track_get_type(track)==TYPE_VALUE) {
					d["cont"]=value_track_is_continuous(track);
				}

				r_ret=d;

				return true;

			} else {


				Dictionary d;

				DVector<float> key_times;
				DVector<float> key_transitions;
				Array key_values;

				int kk=track_get_key_count(track);

				key_times.resize(kk);
				key_transitions.resize(kk);
				key_values.resize(kk);

				DVector<float>::Write wti=key_times.write();
				DVector<float>::Write wtr=key_transitions.write();

				int idx=0;
				for(int i=0;i<track_get_key_count(track);i++) {

					wti[idx]=track_get_key_time(track,i);
					wtr[idx]=track_get_key_transition(track,i);
					key_values[idx]=track_get_key_value(track,i);
					idx++;
				}

				wti=DVector<float>::Write();
				wtr=DVector<float>::Write();

				d["times"]=key_times;
				d["transitions"]=key_transitions;
				d["values"]=key_values;
				if (track_get_type(track)==TYPE_VALUE) {
					d["cont"]=value_track_is_continuous(track);
				}

				r_ret=d;

				return true;

			}
		} else
			return false;
	} else
		return false;

	return true;

}


void Animation::_get_property_list( List<PropertyInfo> *p_list) const {

	p_list->push_back( PropertyInfo( Variant::REAL, "length", PROPERTY_HINT_RANGE, "0.001,99999,0.001"));
	p_list->push_back( PropertyInfo( Variant::BOOL, "loop" ));
	p_list->push_back( PropertyInfo( Variant::REAL, "step", PROPERTY_HINT_RANGE, "0,4096,0.001" ));

	for (int i=0;i<tracks.size();i++) {

		p_list->push_back( PropertyInfo( Variant::STRING, "tracks/"+itos(i)+"/type", PROPERTY_HINT_NONE,"",PROPERTY_USAGE_NOEDITOR) );
		p_list->push_back( PropertyInfo( Variant::NODE_PATH, "tracks/"+itos(i)+"/path", PROPERTY_HINT_NONE,"",PROPERTY_USAGE_NOEDITOR) );
		p_list->push_back( PropertyInfo( Variant::INT, "tracks/"+itos(i)+"/interp", PROPERTY_HINT_NONE,"",PROPERTY_USAGE_NOEDITOR) );
		p_list->push_back( PropertyInfo( Variant::ARRAY, "tracks/"+itos(i)+"/keys", PROPERTY_HINT_NONE,"",PROPERTY_USAGE_NOEDITOR) );
	}
}

int Animation::add_track(TrackType p_type,int p_at_pos) {

	if (p_at_pos<0 || p_at_pos>=tracks.size())
		p_at_pos=tracks.size();

	switch( p_type ) {

		case TYPE_TRANSFORM: {

			TransformTrack *tt = memnew( TransformTrack );
			tracks.insert( p_at_pos,tt );
		} break;
		case TYPE_VALUE: {

			tracks.insert( p_at_pos,memnew( ValueTrack ) );

		} break;
		case TYPE_METHOD: {

			tracks.insert( p_at_pos,memnew( MethodTrack ) );

		} break;
		default: {

			ERR_PRINT("Unknown track type");
		}
	}
	emit_changed();
	return p_at_pos;
}

void Animation::remove_track(int p_track) {

	ERR_FAIL_INDEX(p_track, tracks.size());
	Track *t=tracks[p_track];

	switch(t->type) {

		case TYPE_TRANSFORM: {

			TransformTrack * tt = static_cast<TransformTrack*>(t);
			_clear(tt->transforms);

		} break;
		case TYPE_VALUE: {

			ValueTrack * vt = static_cast<ValueTrack*>(t);
			_clear(vt->values);

		} break;
		case TYPE_METHOD: {

			MethodTrack * mt = static_cast<MethodTrack*>(t);
			_clear(mt->methods);

		} break;
	}

	memdelete( t );
	tracks.remove(p_track);
	emit_changed();
}

int Animation::get_track_count() const {

	return tracks.size();
}

Animation::TrackType Animation::track_get_type(int p_track) const {

	ERR_FAIL_INDEX_V(p_track, tracks.size(), TYPE_TRANSFORM );
	return tracks[p_track]->type;
}

void Animation::track_set_path(int p_track,const NodePath& p_path) {

	ERR_FAIL_INDEX(p_track, tracks.size());
	tracks[p_track]->path=p_path;
	emit_changed();

}

NodePath Animation::track_get_path(int p_track) const {

	ERR_FAIL_INDEX_V(p_track, tracks.size(),NodePath());
	return tracks[p_track]->path;
}

int Animation::find_track(const NodePath& p_path) const {

	for (int i=0; i<tracks.size(); i++) {

		if (tracks[i]->path == p_path)
			return i;
	};
	return -1;
};


void Animation::track_set_interpolation_type(int p_track,InterpolationType p_interp) {

	ERR_FAIL_INDEX(p_track, tracks.size());
	ERR_FAIL_INDEX(p_interp,3);
	tracks[p_track]->interpolation=p_interp;
	emit_changed();

}

Animation::InterpolationType Animation::track_get_interpolation_type(int p_track) const {

	ERR_FAIL_INDEX_V(p_track, tracks.size(),INTERPOLATION_NEAREST);
	return tracks[p_track]->interpolation;
}


// transform
/*
template<class T>
int Animation::_insert_pos(float p_time, T& p_keys) {

	// simple, linear time inset that should be fast enough in reality.

	int idx=p_keys.size();

	while(true) {


		if (idx==0 || p_keys[idx-1].time < p_time) {
			//condition for insertion.
			p_keys.insert(idx,T());
			return idx;
		} else if (p_keys[idx-1].time == p_time) {

			// condition for replacing.
			return idx-1;
		}

		idx--;
	}

}
*/
template<class T, class V>
int Animation::_insert(float p_time, T& p_keys, const V& p_value) {

	int idx=p_keys.size();

	while(true) {


		if (idx==0 || p_keys[idx-1].time < p_time) {
			//condition for insertion.
			p_keys.insert(idx,p_value);
			return idx;
		} else if (p_keys[idx-1].time == p_time) {

			// condition for replacing.
			p_keys[idx-1]=p_value;
			return idx-1;
		}

		idx--;
	}

	return -1;
}

template<class T>
void Animation::_clear(T& p_keys) {


	p_keys.clear();
}

Error Animation::transform_track_get_key(int p_track, int p_key, Vector3* r_loc, Quat* r_rot, Vector3* r_scale) const {

	ERR_FAIL_INDEX_V(p_track, tracks.size(),ERR_INVALID_PARAMETER);
	Track *t=tracks[p_track];

	TransformTrack * tt = static_cast<TransformTrack*>(t);
	ERR_FAIL_COND_V(t->type!=TYPE_TRANSFORM,ERR_INVALID_PARAMETER);
	ERR_FAIL_INDEX_V(p_key,tt->transforms.size(),ERR_INVALID_PARAMETER);

	if (r_loc)
		*r_loc=tt->transforms[p_key].value.loc;
	if (r_rot)
		*r_rot=tt->transforms[p_key].value.rot;
	if (r_scale)
		*r_scale=tt->transforms[p_key].value.scale;

	return OK;
}

int Animation::transform_track_insert_key(int p_track, float p_time, const Vector3 p_loc, const Quat& p_rot, const Vector3& p_scale) {

	ERR_FAIL_INDEX_V(p_track, tracks.size(),-1);
	Track *t=tracks[p_track];
	ERR_FAIL_COND_V(t->type!=TYPE_TRANSFORM,-1);

	TransformTrack * tt = static_cast<TransformTrack*>(t);

	TKey<TransformKey> tkey;
	tkey.time=p_time;
	tkey.value.loc=p_loc;
	tkey.value.rot=p_rot;
	tkey.value.scale=p_scale;

	int ret = _insert( p_time,  tt->transforms, tkey );
	emit_changed();
	return ret;
}

void Animation::track_remove_key_at_pos(int p_track, float p_pos) {

	int idx = track_find_key(p_track,p_pos,true);
	ERR_FAIL_COND(idx < 0);
	track_remove_key(p_track,idx);
}

void Animation::track_remove_key(int p_track, int p_idx) {

	ERR_FAIL_INDEX(p_track,tracks.size());
	Track *t=tracks[p_track];

	switch(t->type)	 {
		case TYPE_TRANSFORM: {

			TransformTrack * tt = static_cast<TransformTrack*>(t);
			ERR_FAIL_INDEX(p_idx,tt->transforms.size());
			tt->transforms.remove(p_idx);

		} break;
		case TYPE_VALUE: {

			ValueTrack * vt = static_cast<ValueTrack*>(t);
			ERR_FAIL_INDEX(p_idx,vt->values.size());
			vt->values.remove(p_idx);

		} break;
		case TYPE_METHOD: {

			MethodTrack * mt = static_cast<MethodTrack*>(t);
			ERR_FAIL_INDEX(p_idx,mt->methods.size());
			mt->methods.remove(p_idx);

		} break;
	}

	emit_changed();
}

int Animation::track_find_key(int p_track, float p_time, bool p_exact) const {

	ERR_FAIL_INDEX_V(p_track,tracks.size(),-1);
	Track *t=tracks[p_track];

	switch(t->type)	 {
		case TYPE_TRANSFORM: {

			TransformTrack * tt = static_cast<TransformTrack*>(t);
			int k = _find(tt->transforms,p_time);
			if (k<0 || k>=tt->transforms.size())
				return -1;
			if (tt->transforms[k].time!=p_time  && p_exact)
				return -1;
			return k;

		} break;
		case TYPE_VALUE: {

			ValueTrack * vt = static_cast<ValueTrack*>(t);
			int k = _find(vt->values,p_time);
			if (k<0 || k>=vt->values.size())
				return -1;
			if (vt->values[k].time!=p_time  && p_exact)
				return -1;
			return k;

		} break;
		case TYPE_METHOD: {

			MethodTrack * mt = static_cast<MethodTrack*>(t);
			int k = _find(mt->methods,p_time);
			if (k<0 || k>=mt->methods.size())
				return -1;
			if (mt->methods[k].time!=p_time && p_exact)
				return -1;
			return k;

		} break;
	}

	return -1;
}


void Animation::track_insert_key(int p_track, float p_time, const Variant& p_value,float p_transition) {

	ERR_FAIL_INDEX(p_track, tracks.size());
	Track *t=tracks[p_track];

	switch(t->type) {

		case TYPE_TRANSFORM: {

			Dictionary d = p_value;
			Vector3 loc;
			if (d.has("loc"))
				loc=d["loc"];

			Quat rot;
			if (d.has("rot"))
				rot=d["rot"];

			Vector3 scale;
			if (d.has("scale"))
				scale=d["scale"];

			int idx = transform_track_insert_key(p_track,p_time,loc,rot,scale);
			track_set_key_transition(p_track,idx,p_transition);

		} break;
		case TYPE_VALUE: {

			ValueTrack * vt = static_cast<ValueTrack*>(t);

			TKey<Variant>  k;
			k.time=p_time;
			k.transition=p_transition;
			k.value=p_value;
			_insert( p_time,  vt->values, k );

		} break;
		case TYPE_METHOD: {

			MethodTrack * mt = static_cast<MethodTrack*>(t);

			ERR_FAIL_COND( p_value.get_type() != Variant::DICTIONARY );

			Dictionary d=p_value;
			ERR_FAIL_COND(!d.has("method") || d["method"].get_type()!=Variant::STRING);
			ERR_FAIL_COND(!d.has("args") || !d["args"].is_array());

			MethodKey k;

			k.time=p_time;
			k.transition=p_transition;
			k.method=d["method"];
			k.params=d["args"];

			_insert( p_time,  mt->methods, k );

		} break;

	}

	emit_changed();
}

int Animation::track_get_key_count(int p_track) const {

	ERR_FAIL_INDEX_V(p_track, tracks.size(),-1);
	Track *t=tracks[p_track];

	switch(t->type) {

		case TYPE_TRANSFORM: {

			TransformTrack * tt = static_cast<TransformTrack*>(t);
			return tt->transforms.size();
		} break;
		case TYPE_VALUE: {

			ValueTrack * vt = static_cast<ValueTrack*>(t);
			return vt->values.size();

		} break;
		case TYPE_METHOD: {

			MethodTrack * mt = static_cast<MethodTrack*>(t);
			return mt->methods.size();
		} break;
	}

	ERR_FAIL_V(-1);
}

Variant Animation::track_get_key_value(int p_track, int p_key_idx) const {

	ERR_FAIL_INDEX_V(p_track, tracks.size(), Variant());
	Track *t=tracks[p_track];

	switch(t->type) {

		case TYPE_TRANSFORM: {

			TransformTrack * tt = static_cast<TransformTrack*>(t);
			ERR_FAIL_INDEX_V( p_key_idx, tt->transforms.size(), Variant() );

			Dictionary d;
			d["loc"]=tt->transforms[p_key_idx].value.loc;
			d["rot"]=tt->transforms[p_key_idx].value.rot;
			d["scale"]=tt->transforms[p_key_idx].value.scale;

			return d;
		} break;
		case TYPE_VALUE: {

			ValueTrack * vt = static_cast<ValueTrack*>(t);
			ERR_FAIL_INDEX_V( p_key_idx, vt->values.size(), Variant() );
			return vt->values[p_key_idx].value;

		} break;
		case TYPE_METHOD: {

			MethodTrack * mt = static_cast<MethodTrack*>(t);
			ERR_FAIL_INDEX_V( p_key_idx, mt->methods.size(), Variant() );
			Dictionary d;
			d["method"]=mt->methods[p_key_idx].method;
			d["args"]=mt->methods[p_key_idx].params;
			return d;

		} break;

	}

	ERR_FAIL_V(Variant());
}

float Animation::track_get_key_time(int p_track, int p_key_idx) const {

	ERR_FAIL_INDEX_V(p_track, tracks.size(), -1);
	Track *t=tracks[p_track];

	switch(t->type) {

		case TYPE_TRANSFORM: {

			TransformTrack * tt = static_cast<TransformTrack*>(t);
			ERR_FAIL_INDEX_V( p_key_idx, tt->transforms.size(), -1 );
			return tt->transforms[p_key_idx].time;
		} break;
		case TYPE_VALUE: {

			ValueTrack * vt = static_cast<ValueTrack*>(t);
			ERR_FAIL_INDEX_V( p_key_idx, vt->values.size(), -1 );
			return vt->values[p_key_idx].time;


		} break;
		case TYPE_METHOD: {

			MethodTrack * mt = static_cast<MethodTrack*>(t);
			ERR_FAIL_INDEX_V( p_key_idx, mt->methods.size(), -1 );
			return mt->methods[p_key_idx].time;


		} break;
	}

	ERR_FAIL_V(-1);

}

float Animation::track_get_key_transition(int p_track, int p_key_idx) const {

	ERR_FAIL_INDEX_V(p_track, tracks.size(), -1);
	Track *t=tracks[p_track];

	switch(t->type) {

		case TYPE_TRANSFORM: {

			TransformTrack * tt = static_cast<TransformTrack*>(t);
			ERR_FAIL_INDEX_V( p_key_idx, tt->transforms.size(), -1 );
			return tt->transforms[p_key_idx].transition;
		} break;
		case TYPE_VALUE: {

			ValueTrack * vt = static_cast<ValueTrack*>(t);
			ERR_FAIL_INDEX_V( p_key_idx, vt->values.size(), -1 );
			return vt->values[p_key_idx].transition;


		} break;
		case TYPE_METHOD: {

			MethodTrack * mt = static_cast<MethodTrack*>(t);
			ERR_FAIL_INDEX_V( p_key_idx, mt->methods.size(), -1 );
			return mt->methods[p_key_idx].transition;


		} break;
	}

	ERR_FAIL_V(0);

}

void Animation::track_set_key_value(int p_track, int p_key_idx,const Variant& p_value) {

	ERR_FAIL_INDEX(p_track, tracks.size());
	Track *t=tracks[p_track];

	switch(t->type) {

		case TYPE_TRANSFORM: {

			TransformTrack * tt = static_cast<TransformTrack*>(t);
			ERR_FAIL_INDEX( p_key_idx, tt->transforms.size());
			Dictionary d = p_value;
			if (d.has("loc"))
				tt->transforms[p_key_idx].value.loc=d["loc"];
			if (d.has("rot"))
				tt->transforms[p_key_idx].value.rot=d["rot"];
			if (d.has("scale"))
				tt->transforms[p_key_idx].value.scale=d["scale"];

		} break;
		case TYPE_VALUE: {

			ValueTrack * vt = static_cast<ValueTrack*>(t);
			ERR_FAIL_INDEX( p_key_idx, vt->values.size());
			vt->values[p_key_idx].value=p_value;

		} break;
		case TYPE_METHOD: {

			MethodTrack * mt = static_cast<MethodTrack*>(t);
			ERR_FAIL_INDEX( p_key_idx, mt->methods.size());
			Dictionary d = p_value;
			if (d.has("method"))
				mt->methods[p_key_idx].method=d["method"];
			if (d.has("args"))
				mt->methods[p_key_idx].params=d["args"];
		} break;
	}

}

void Animation::track_set_key_transition(int p_track, int p_key_idx,float p_transition) {

	ERR_FAIL_INDEX(p_track, tracks.size());
	Track *t=tracks[p_track];

	switch(t->type) {

		case TYPE_TRANSFORM: {

			TransformTrack * tt = static_cast<TransformTrack*>(t);
			ERR_FAIL_INDEX( p_key_idx, tt->transforms.size());
			tt->transforms[p_key_idx].transition=p_transition;
		} break;
		case TYPE_VALUE: {

			ValueTrack * vt = static_cast<ValueTrack*>(t);
			ERR_FAIL_INDEX( p_key_idx, vt->values.size());
			vt->values[p_key_idx].transition=p_transition;


		} break;
		case TYPE_METHOD: {

			MethodTrack * mt = static_cast<MethodTrack*>(t);
			ERR_FAIL_INDEX( p_key_idx, mt->methods.size());
			mt->methods[p_key_idx].transition=p_transition;


		} break;
	}

}



template<class K>
int Animation::_find( const Vector<K>& p_keys, float p_time) const {

	int len=p_keys.size();
	if (len==0)
		return -2;

	int low = 0;
	int high = len -1;
	int middle;

	const K* keys =&p_keys[0];

	while( low <= high ) {

		middle = ( low  + high ) / 2;

		if( p_time == keys[  middle ].time ) { //match
			return middle;
		} else if( p_time < keys[middle].time )
			high = middle - 1; //search low end of array
		else
			low = middle + 1; //search high end of array
	}

	if (keys[middle].time>p_time)
		middle--;

	return middle;
}

Animation::TransformKey Animation::_interpolate( const Animation::TransformKey& p_a, const Animation::TransformKey& p_b, float p_c) const {

	TransformKey ret;
	ret.loc=_interpolate(p_a.loc,p_b.loc,p_c);
	ret.rot=_interpolate(p_a.rot,p_b.rot,p_c);
	ret.scale=_interpolate(p_a.scale,p_b.scale,p_c);

	return ret;
}

Vector3 Animation::_interpolate( const Vector3& p_a, const Vector3& p_b, float p_c) const {

	return p_a.linear_interpolate(p_b,p_c);
}
Quat Animation::_interpolate( const Quat& p_a, const Quat& p_b, float p_c) const {

	return p_a.slerp(p_b,p_c);
}
Variant Animation::_interpolate( const Variant& p_a, const Variant& p_b, float p_c) const {

	Variant dst;
	Variant::interpolate(p_a,p_b,p_c,dst);
	return dst;
}


float Animation::_interpolate( const float& p_a, const float& p_b, float p_c) const {

	return p_a*(1.0-p_c) + p_b*p_c;
}

Animation::TransformKey Animation::_cubic_interpolate( const Animation::TransformKey& p_pre_a, const Animation::TransformKey& p_a, const Animation::TransformKey& p_b, const Animation::TransformKey& p_post_b,float p_c) const {


	Animation::TransformKey tk;

	tk.loc = p_a.loc.cubic_interpolate(p_b.loc,p_pre_a.loc,p_post_b.loc,p_c);
	tk.scale = p_a.scale.cubic_interpolate(p_b.scale,p_pre_a.scale,p_post_b.scale,p_c);
	tk.rot = p_a.rot.cubic_slerp(p_b.rot,p_pre_a.rot,p_post_b.rot,p_c);

	return tk;

}
Vector3 Animation::_cubic_interpolate( const Vector3& p_pre_a,const Vector3& p_a, const Vector3& p_b,const Vector3& p_post_b, float p_c) const {

	return p_a.cubic_interpolate(p_b,p_pre_a,p_post_b,p_c);
}
Quat Animation::_cubic_interpolate( const Quat& p_pre_a,const Quat& p_a, const Quat& p_b,const Quat& p_post_b, float p_c) const {

	return p_a.cubic_slerp(p_b,p_pre_a,p_post_b,p_c);
}
Variant Animation::_cubic_interpolate( const Variant& p_pre_a,const Variant& p_a, const Variant& p_b, const Variant& p_post_b,float p_c) const {

	Variant::Type type_a=p_a.get_type();
	Variant::Type type_b=p_b.get_type();
	Variant::Type type_pa=p_pre_a.get_type();
	Variant::Type type_pb=p_post_b.get_type();

	//make int and real play along

	uint32_t vformat=1<<type_a;
	vformat|=1<<type_b;
	vformat|=1<<type_pa;
	vformat|=1<<type_pb;

	if (vformat==((1<<Variant::INT)|(1<<Variant::REAL)) || vformat==(1<<Variant::REAL)) {
		//mix of real and int

		real_t p0=p_pre_a;
		real_t p1=p_a;
		real_t p2=p_b;
		real_t p3=p_post_b;

		float t = p_c;
		float t2 = t * t;
		float t3 = t2 * t;

		return
		 0.5f * ( ( p1 * 2.0f) +
		( -p0 + p2 ) * t +
		( 2.0f * p0 - 5.0f * p1 + 4 * p2 - p3 ) * t2 +
		( -p0 + 3.0f * p1 - 3.0f * p2 + p3 ) * t3 );


	} else if ((vformat & (vformat - 1))) {

		return p_a; //can't interpolate, mix of types
	}

	switch(type_a) {

		case Variant::VECTOR2: {

			Vector2 a=p_a;
			Vector2 b=p_b;
			Vector2 pa=p_pre_a;
			Vector2 pb=p_post_b;

			return a.cubic_interpolate(b,pa,pb,p_c);

		} break;
		case Variant::RECT2: {

			Rect2 a=p_a;
			Rect2 b=p_b;
			Rect2 pa=p_pre_a;
			Rect2 pb=p_post_b;

			return Rect2(
				a.pos.cubic_interpolate(b.pos,pa.pos,pb.pos,p_c),
				a.size.cubic_interpolate(b.size,pa.size,pb.size,p_c)
			);

		} break;
		case Variant::VECTOR3: {

			Vector3 a=p_a;
			Vector3 b=p_b;
			Vector3 pa=p_pre_a;
			Vector3 pb=p_post_b;

			return a.cubic_interpolate(b,pa,pb,p_c);

		} break;
		case Variant::QUAT: {

			Quat a=p_a;
			Quat b=p_b;
			Quat pa=p_pre_a;
			Quat pb=p_post_b;

			return a.cubic_slerp(b,pa,pb,p_c);

		} break;
		case Variant::_AABB: {

			AABB a=p_a;
			AABB b=p_b;
			AABB pa=p_pre_a;
			AABB pb=p_post_b;

			return AABB(
				a.pos.cubic_interpolate(b.pos,pa.pos,pb.pos,p_c),
				a.size.cubic_interpolate(b.size,pa.size,pb.size,p_c)
			);
		} break;
		default: {

			return _interpolate(p_a,p_b,p_c);
		}
	}

	return Variant();
}
float Animation::_cubic_interpolate( const float& p_pre_a,const float& p_a, const float& p_b, const float& p_post_b, float p_c) const {

	return _interpolate(p_a,p_b,p_c);
}

template<class T>
T Animation::_interpolate( const Vector< TKey<T> >& p_keys, float p_time,  InterpolationType p_interp, bool *p_ok) const {

	int len=_find( p_keys, length )+1; // try to find last key (there may be more past the end)

	if (len<=0) {
		// (-1 or -2 returned originally) (plus one above)
		// meaning no keys, or only key time is larger than length
		if (p_ok)
			*p_ok=false;
		return T();
	} else if (len==1) { // one key found (0+1), return it

		if (p_ok)
			*p_ok=true;
		return p_keys[0].value;
	}

	int idx=_find(p_keys, p_time);

	ERR_FAIL_COND_V( idx==-2, T());

	if (p_ok)
		*p_ok=true;

	int next=0;
	float c=0;
	// prepare for all cases of interpolation

	if (loop) {
	// loop
		if (idx>=0) {

			if ((idx+1) < len) {

				next=idx+1;
				float delta=p_keys[next].time - p_keys[idx].time;
				float from=p_time-p_keys[idx].time;

				if (Math::absf(delta)>CMP_EPSILON)
					c=from/delta;
				else
					c=0;

			} else {

				next=0;
				float delta=(length - p_keys[idx].time) + p_keys[next].time;
				float from=p_time-p_keys[idx].time;

				if (Math::absf(delta)>CMP_EPSILON)
					c=from/delta;
				else
					c=0;

			}

		} else {
			// on loop, behind first key
			idx=len-1;
			next=0;
			float endtime=(length - p_keys[idx].time);
			if (endtime<0) // may be keys past the end
				endtime=0;
			float delta=endtime + p_keys[next].time;
			float from=endtime+p_time;

			if (Math::absf(delta)>CMP_EPSILON)
				c=from/delta;
			else
				c=0;
		}

	} else { // no loop

		if (idx>=0) {

			if ((idx+1) < len) {

				next=idx+1;
				float delta=p_keys[next].time - p_keys[idx].time;
				float from=p_time - p_keys[idx].time;

				if (Math::absf(delta)>CMP_EPSILON)
					c=from/delta;
				else
					c=0;

			} else {

				next=idx;
			}

		} else if (idx<0) {

			idx=next=0;
		}

	}

	float tr = p_keys[idx].transition;

	if (tr==0 || idx==next) {
		// don't interpolate if not needed
		return p_keys[idx].value;
	}

	if (tr!=1.0) {

		c = Math::ease(c,tr);
	}

	switch(p_interp) {

		case INTERPOLATION_NEAREST: {

			return p_keys[idx].value;
		} break;
		case INTERPOLATION_LINEAR: {

			return _interpolate(p_keys[idx].value, p_keys[next].value, c);
		} break;
		case INTERPOLATION_CUBIC: {
			int pre = idx-1;
			if (pre<0)
				pre=0;
			int post = next+1;
			if (post>=len)
				post=next;


			return _cubic_interpolate(p_keys[pre].value,p_keys[idx].value, p_keys[next].value,p_keys[post].value, c);

		} break;
		default: return p_keys[idx].value;
	}

	// do a barrel roll


}


Error Animation::transform_track_interpolate(int p_track, float p_time, Vector3 * r_loc, Quat *r_rot, Vector3 *r_scale) const {

	ERR_FAIL_INDEX_V(p_track, tracks.size(),ERR_INVALID_PARAMETER);
	Track *t=tracks[p_track];
	ERR_FAIL_COND_V(t->type!=TYPE_TRANSFORM,ERR_INVALID_PARAMETER);

	TransformTrack * tt = static_cast<TransformTrack*>(t);

	bool ok;

	TransformKey tk = _interpolate( tt->transforms, p_time, tt->interpolation, &ok );

	if (!ok) // ??
		return ERR_UNAVAILABLE;

	if (r_loc)
		*r_loc=tk.loc;

	if (r_rot)
		*r_rot=tk.rot;

	if (r_scale)
		*r_scale=tk.scale;

	return OK;

}

Variant Animation::value_track_interpolate(int p_track, float p_time) const {

	ERR_FAIL_INDEX_V(p_track, tracks.size(),0);
	Track *t=tracks[p_track];
	ERR_FAIL_COND_V(t->type!=TYPE_VALUE, Variant());
	ValueTrack * vt = static_cast<ValueTrack*>(t);

	bool ok;


	Variant res = _interpolate( vt->values, p_time, vt->interpolation, &ok );


	if (ok) {

		return res;
	}

	return Variant();
}

void Animation::_value_track_get_key_indices_in_range(const ValueTrack * vt, float from_time, float to_time,List<int> *p_indices) const {

	if (from_time!=length && to_time==length)
		to_time=length*1.01; //include a little more if at the end
	int to=_find( vt->values, to_time);

	// can't really send the events == time, will be sent in the next frame.
	// if event>=len then it will probably never be requested by the anim player.

	if (to>=0 && vt->values[to].time>=to_time)
		to--;

	if (to<0)
		return; // not bother

	int from=_find( vt->values, from_time);

	// position in the right first event.+
	if (from<0 || vt->values[from].time<from_time)
		from++;

	int max=vt->values.size();

	for (int i=from;i<=to;i++) {

		ERR_CONTINUE( i<0 || i>=max); // shouldn't happen
		p_indices->push_back(i);
	}


}

void Animation::value_track_get_key_indices(int p_track, float p_time, float p_delta,List<int> *p_indices) const {

	ERR_FAIL_INDEX(p_track, tracks.size());
	Track *t=tracks[p_track];
	ERR_FAIL_COND( t->type != TYPE_VALUE );

	ValueTrack * vt = static_cast<ValueTrack*>(t);

	float from_time=p_time-p_delta;
	float to_time=p_time;

	if (from_time>to_time)
		SWAP(from_time,to_time);

	if (loop) {

		from_time=Math::fposmod(from_time,length);
		to_time=Math::fposmod(to_time,length);

		if (from_time>to_time) {
			// handle loop by splitting
			_value_track_get_key_indices_in_range(vt,length-from_time,length,p_indices);
			_value_track_get_key_indices_in_range(vt,0,to_time,p_indices);
			return;
		}
	} else {

		if (from_time<0)
			from_time=0;
		if (from_time>length)
			from_time=length;

		if (to_time<0)
			to_time=0;
		if (to_time>length)
			to_time=length;


	}

	_value_track_get_key_indices_in_range(vt,from_time,to_time,p_indices);


}

void Animation::value_track_set_continuous(int p_track, bool p_continuous) {

	ERR_FAIL_INDEX(p_track, tracks.size());
	Track *t=tracks[p_track];
	ERR_FAIL_COND( t->type != TYPE_VALUE );

	ValueTrack * vt = static_cast<ValueTrack*>(t);
	vt->continuous=p_continuous;

}

bool Animation::value_track_is_continuous(int p_track) const{

	ERR_FAIL_INDEX_V(p_track, tracks.size(), false);
	Track *t=tracks[p_track];
	ERR_FAIL_COND_V( t->type != TYPE_VALUE, false );

	ValueTrack * vt = static_cast<ValueTrack*>(t);
	return vt->continuous;

}

void Animation::_method_track_get_key_indices_in_range(const MethodTrack * mt, float from_time, float to_time,List<int> *p_indices) const {

	if (from_time!=length && to_time==length)
		to_time=length*1.01; //include a little more if at the end


	int to=_find( mt->methods, to_time);

	// can't really send the events == time, will be sent in the next frame.
	// if event>=len then it will probably never be requested by the anim player.

	if (to>=0 && mt->methods[to].time>=to_time)
		to--;

	if (to<0)
		return; // not bother

	int from=_find( mt->methods, from_time);

	// position in the right first event.+
	if (from<0 || mt->methods[from].time<from_time)
		from++;

	int max=mt->methods.size();

	for (int i=from;i<=to;i++) {

		ERR_CONTINUE( i<0 || i>=max); // shouldn't happen
		p_indices->push_back(i);
	}

}

void Animation::method_track_get_key_indices(int p_track, float p_time, float p_delta,List<int> *p_indices) const {

	ERR_FAIL_INDEX(p_track, tracks.size());
	Track *t=tracks[p_track];
	ERR_FAIL_COND( t->type != TYPE_METHOD );

	MethodTrack * mt = static_cast<MethodTrack*>(t);

	float from_time=p_time-p_delta;
	float to_time=p_time;

	if (from_time>to_time)
		SWAP(from_time,to_time);

	if (loop) {

		if (from_time > length || from_time < 0)
			from_time=Math::fposmod(from_time,length);

		if (to_time > length || to_time < 0)
			to_time=Math::fposmod(to_time,length);

		if (from_time>to_time) {
			// handle loop by splitting
			_method_track_get_key_indices_in_range(mt,from_time,length,p_indices);
			_method_track_get_key_indices_in_range(mt,0,to_time,p_indices);
			return;
		}
	} else {

		if (from_time<0)
			from_time=0;
		if (from_time>length)
			from_time=length;

		if (to_time<0)
			to_time=0;
		if (to_time>length)
			to_time=length;

	}

	_method_track_get_key_indices_in_range(mt,from_time,to_time,p_indices);


}
Vector<Variant> Animation::method_track_get_params(int p_track,int p_key_idx) const {

	ERR_FAIL_INDEX_V(p_track, tracks.size(),Vector<Variant>());
	Track *t=tracks[p_track];
	ERR_FAIL_COND_V( t->type != TYPE_METHOD, Vector<Variant>() );

	MethodTrack * pm = static_cast<MethodTrack*>(t);

	ERR_FAIL_INDEX_V( p_key_idx, pm->methods.size(), Vector<Variant>() );

	const MethodKey& mk=pm->methods[p_key_idx];

	return mk.params;
}
StringName Animation::method_track_get_name(int p_track,int p_key_idx) const {

	ERR_FAIL_INDEX_V(p_track, tracks.size(),StringName());
	Track *t=tracks[p_track];
	ERR_FAIL_COND_V( t->type != TYPE_METHOD, StringName() );

	MethodTrack * pm = static_cast<MethodTrack*>(t);

	ERR_FAIL_INDEX_V( p_key_idx, pm->methods.size(), StringName() );

	return pm->methods[ p_key_idx ].method;

}


void Animation::set_length(float p_length) {

	ERR_FAIL_COND( length<0 );
	length=p_length;
	emit_changed();
}
float Animation::get_length() const {

	return length;
}

void Animation::set_loop(bool p_enabled) {

	loop=p_enabled;
	emit_changed();
}
bool Animation::has_loop() const {

	return loop;
}

void Animation::track_move_up(int p_track) {


	if (p_track>=0 && p_track<(tracks.size()-1)) {

		SWAP( tracks[p_track], tracks[p_track+1] );
	}

	emit_changed();
}

void Animation::track_move_down(int p_track) {

	if (p_track>0 && p_track<tracks.size()) {

		SWAP( tracks[p_track], tracks[p_track-1] );
	}
	emit_changed();
}

void Animation::set_step(float p_step) {

	step=p_step;
	emit_changed();
}

float Animation::get_step() const{

	return step;
}


void Animation::_bind_methods() {

	ObjectTypeDB::bind_method(_MD("add_track","type","at_pos"),&Animation::add_track,DEFVAL(-1));
	ObjectTypeDB::bind_method(_MD("remove_track","idx"),&Animation::remove_track);
	ObjectTypeDB::bind_method(_MD("get_track_count"),&Animation::get_track_count);
	ObjectTypeDB::bind_method(_MD("track_get_type","idx"),&Animation::track_get_type);
	ObjectTypeDB::bind_method(_MD("track_get_path","idx"),&Animation::track_get_path);
	ObjectTypeDB::bind_method(_MD("track_set_path","idx","path"),&Animation::track_set_path);
	ObjectTypeDB::bind_method(_MD("find_track","path"),&Animation::find_track);

	ObjectTypeDB::bind_method(_MD("track_move_up","idx"),&Animation::track_move_up);
	ObjectTypeDB::bind_method(_MD("track_move_down","idx"),&Animation::track_move_down);

	ObjectTypeDB::bind_method(_MD("transform_track_insert_key","idx","time","loc","rot","scale"),&Animation::transform_track_insert_key);
	ObjectTypeDB::bind_method(_MD("track_insert_key","idx","time","key","transition"),&Animation::track_insert_key,DEFVAL(1));
	ObjectTypeDB::bind_method(_MD("track_remove_key","idx","key_idx"),&Animation::track_remove_key);
	ObjectTypeDB::bind_method(_MD("track_remove_key_at_pos","idx","pos"),&Animation::track_remove_key_at_pos);
	ObjectTypeDB::bind_method(_MD("track_set_key_value","idx","key","value"),&Animation::track_set_key_value);
	ObjectTypeDB::bind_method(_MD("track_set_key_transition","idx","key_idx","transition"),&Animation::track_set_key_transition);
	ObjectTypeDB::bind_method(_MD("track_get_key_transition","idx","key_idx"),&Animation::track_get_key_transition);

	ObjectTypeDB::bind_method(_MD("track_get_key_count","idx"),&Animation::track_get_key_count);
	ObjectTypeDB::bind_method(_MD("track_get_key_value","idx","key_idx"),&Animation::track_get_key_value);
	ObjectTypeDB::bind_method(_MD("track_get_key_time","idx","key_idx"),&Animation::track_get_key_time);
	ObjectTypeDB::bind_method(_MD("track_find_key","idx","time","exact"),&Animation::track_find_key,DEFVAL(false));

	ObjectTypeDB::bind_method(_MD("track_set_interpolation_type","idx","interpolation"),&Animation::track_set_interpolation_type);
	ObjectTypeDB::bind_method(_MD("track_get_interpolation_type","idx"),&Animation::track_get_interpolation_type);



	ObjectTypeDB::bind_method(_MD("transform_track_interpolate","idx","time_sec"),&Animation::_transform_track_interpolate);
	ObjectTypeDB::bind_method(_MD("value_track_set_continuous","idx","continuous"),&Animation::value_track_set_continuous);
	ObjectTypeDB::bind_method(_MD("value_track_is_continuous","idx"),&Animation::value_track_is_continuous);

	ObjectTypeDB::bind_method(_MD("value_track_get_key_indices","idx","time_sec","delta"),&Animation::_value_track_get_key_indices);

	ObjectTypeDB::bind_method(_MD("method_track_get_key_indices","idx","time_sec","delta"),&Animation::_method_track_get_key_indices);
	ObjectTypeDB::bind_method(_MD("method_track_get_name","idx","key_idx"),&Animation::method_track_get_name);
	ObjectTypeDB::bind_method(_MD("method_track_get_params","idx","key_idx"),&Animation::method_track_get_params);

	ObjectTypeDB::bind_method(_MD("set_length","time_sec"),&Animation::set_length);
	ObjectTypeDB::bind_method(_MD("get_length"),&Animation::get_length);

	ObjectTypeDB::bind_method(_MD("set_loop","enabled"),&Animation::set_loop);
	ObjectTypeDB::bind_method(_MD("has_loop"),&Animation::has_loop);

	ObjectTypeDB::bind_method(_MD("set_step","size_sec"),&Animation::set_step);
	ObjectTypeDB::bind_method(_MD("get_step"),&Animation::get_step);

	ObjectTypeDB::bind_method(_MD("clear"),&Animation::clear);

	BIND_CONSTANT( TYPE_VALUE );
	BIND_CONSTANT( TYPE_TRANSFORM );
	BIND_CONSTANT( TYPE_METHOD );

	BIND_CONSTANT( INTERPOLATION_NEAREST );
	BIND_CONSTANT( INTERPOLATION_LINEAR );
	BIND_CONSTANT( INTERPOLATION_CUBIC );

}

void Animation::clear() {

	for(int i=0;i<tracks.size();i++)
		memdelete( tracks[i] );
	tracks.clear();
	loop=false;
	length=1;

}



bool Animation::_transform_track_optimize_key(const TKey<TransformKey> &t0,const TKey<TransformKey> &t1, const TKey<TransformKey> &t2, float p_alowed_linear_err,float p_alowed_angular_err,float p_max_optimizable_angle,const Vector3& p_norm) {


	real_t c = (t1.time-t0.time)/(t2.time-t0.time);
	real_t t[3]={-1,-1,-1};

	{ //translation

		const Vector3 &v0=t0.value.loc;
		const Vector3 &v1=t1.value.loc;
		const Vector3 &v2=t2.value.loc;

		if (v0.distance_to(v2)<CMP_EPSILON) {
			//0 and 2 are close, let's see if 1 is close
			if (v0.distance_to(v1)>CMP_EPSILON) {
				//not close, not optimizable
				return false;
			}

		} else {

			Vector3 pd = (v2-v0);
			float d0 = pd.dot(v0);
			float d1 = pd.dot(v1);
			float d2 = pd.dot(v2);
			if (d1<d0 || d1>d2) {
				return false;
			}

			Vector3 s[2]={ v0, v2 };
			real_t d =Geometry::get_closest_point_to_segment(v1,s).distance_to(v1);

			if (d>pd.length()*p_alowed_linear_err) {
				return false; //beyond allowed error for colinearity
			}

			if (p_norm!=Vector3() && Math::acos(pd.normalized().dot(p_norm))>p_alowed_angular_err)
				return false;

			t[0] = (d1-d0)/(d2-d0);
		}
	}

	{ //rotation

		const Quat &q0=t0.value.rot;
		const Quat &q1=t1.value.rot;
		const Quat &q2=t2.value.rot;

		//localize both to rotation from q0

		if ((q0-q2).length() < CMP_EPSILON) {

			if ((q0-q1).length() > CMP_EPSILON)
				return false;

		} else {


			Quat r02 = (q0.inverse() * q2).normalized();
			Quat r01 = (q0.inverse() * q1).normalized();

			Vector3 v02,v01;
			real_t a02,a01;

			r02.get_axis_and_angle(v02,a02);
			r01.get_axis_and_angle(v01,a01);

			if (Math::abs(a02)>p_max_optimizable_angle)
				return false;

			if (v01.dot(v02)<0) {
				//make sure both rotations go the same way to compare
				v02=-v02;
				a02=-a02;
			}

			real_t err_01 = Math::acos(v01.normalized().dot(v02.normalized()))/Math_PI;
			if (err_01>p_alowed_angular_err) {
				//not rotating in the same axis
				return false;
			}

			if (a01*a02 < 0 ) {
				//not rotating in the same direction
				return false;
			}

			real_t tr = a01/a02;
			if (tr<0 || tr>1)
				return false; //rotating too much or too less

			t[1]=tr;

		}

	}

	{ //scale

		const Vector3 &v0=t0.value.scale;
		const Vector3 &v1=t1.value.scale;
		const Vector3 &v2=t2.value.scale;

		if (v0.distance_to(v2)<CMP_EPSILON) {
			//0 and 2 are close, let's see if 1 is close
			if (v0.distance_to(v1)>CMP_EPSILON) {
				//not close, not optimizable
				return false;
			}

		} else {

			Vector3 pd = (v2-v0);
			float d0 = pd.dot(v0);
			float d1 = pd.dot(v1);
			float d2 = pd.dot(v2);
			if (d1<d0 || d1>d2) {
				return false; //beyond segment range
			}

			Vector3 s[2]={ v0, v2 };
			real_t d =Geometry::get_closest_point_to_segment(v1,s).distance_to(v1);

			if (d>pd.length()*p_alowed_linear_err) {
				return false; //beyond allowed error for colinearity
			}

			t[2] = (d1-d0)/(d2-d0);
		}
	}

	bool erase=false;
	if (t[0]==-1 && t[1]==-1 && t[2]==-1) {

		erase=true;
	} else {

		erase=true;
		real_t lt=-1;
		for(int j=0;j<3;j++) {
			//search for t on first, one must be it
			if (t[j]!=-1) {
				lt=t[j]; //official t
				//validate rest
				for(int k=j+1;k<3;k++) {
					if (t[k]==-1)
						continue;

					if (Math::abs(lt-t[k])>p_alowed_linear_err) {
						erase=false;
						break;
					}
				}
				break;
			}
		}

		ERR_FAIL_COND_V( lt==-1,false );

		if (erase) {

			if (Math::abs(lt-c)>p_alowed_linear_err) {
				//todo, evaluate changing the transition if this fails?
				//this could be done as a second pass and would be
				//able to optimize more
				erase=false;
			} else {

				//print_line(itos(i)+"because of interp");
			}
		}

	}


	return erase;


}


void Animation::_transform_track_optimize(int p_idx,float p_alowed_linear_err,float p_alowed_angular_err,float p_max_optimizable_angle) {

	ERR_FAIL_INDEX(p_idx,tracks.size());
	ERR_FAIL_COND(tracks[p_idx]->type!=TYPE_TRANSFORM);
	TransformTrack *tt= static_cast<TransformTrack*>(tracks[p_idx]);
	bool prev_erased=false;
	TKey<TransformKey> first_erased;

	Vector3 norm;

	for(int i=1;i<tt->transforms.size()-1;i++) {

		TKey<TransformKey> &t0 = tt->transforms[i-1];
		TKey<TransformKey> &t1 = tt->transforms[i];
		TKey<TransformKey> &t2 = tt->transforms[i+1];

		bool erase = _transform_track_optimize_key(t0,t1,t2,p_alowed_linear_err,p_alowed_angular_err,p_max_optimizable_angle,norm);
		if (erase && !prev_erased) {
			norm=(t2.value.loc-t1.value.loc).normalized();
		}


		if (prev_erased && !_transform_track_optimize_key(t0,first_erased,t2,p_alowed_linear_err,p_alowed_angular_err,p_max_optimizable_angle,norm)) {
			 //avoid error to go beyond first erased key
			erase=false;
		}


		if (erase) {

			if (!prev_erased) {
				first_erased=t1;
				prev_erased=true;
			}

			tt->transforms.remove(i);
			i--;

		} else {
			prev_erased=false;
			norm=Vector3();
		}



		//	print_line(itos(i)+" could be eliminated: "+rtos(tr));
		//}
	}


}

void Animation::optimize(float p_allowed_linear_err,float p_allowed_angular_err,float p_angle_max) {


	int total_tt=0;

	for(int i=0;i<tracks.size();i++) {

		if (tracks[i]->type==TYPE_TRANSFORM)
			_transform_track_optimize(i,p_allowed_linear_err,p_allowed_angular_err,p_angle_max);

	}

}


Animation::Animation() {

	step=0.1;
	loop=false;
	length=1;
}


Animation::~Animation() {

	for(int i=0;i<tracks.size();i++)
		memdelete( tracks[i] );

}


