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Document tangents being required for normal maps in Using the SurfaceTool

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Hugo Locurcio
2022-11-30 16:33:06 +01:00
parent cd47f19aa4
commit 2bbd8d8403
1 changed files with 6 additions and 2 deletions
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tutorials/3d/procedural_geometry/surfacetool.rst
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@@ -92,8 +92,12 @@ be called after generating geometry and before committing the mesh using ``commi
``commit_to_arrays()``. Calling ``generate_normals(true)`` will flip the resulting normals. As a side
note, ``generate_normals()`` only works if the primitive type is set to ``Mesh.PRIMITIVE_TRIANGLES``.
If you don't add custom tangents, they can be added with ``generate_tangents()``, but it requires
that each vertex have UVs and normals set already.
You may notice that normal mapping or other material properties look broken on
the generated mesh. This is because normal mapping **requires** the mesh to
feature *tangents*, which are separate from *normals*. You can either add custom
tangents manually, or generate them automatically with with
``generate_tangents()``. This method requires that each vertex have UVs and
normals set already.
.. tabs::
.. code-tab:: gdscript GDScript