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Mention that user is responsible for POSITION value when it's written to anywhere in the shader

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(cherry picked from commit f6ddd71040)
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jsjtxietian
2024-05-10 15:26:25 +08:00
committed by Max Hilbrunner
parent 1d281f3c14
commit b2599b7b86
1 changed files with 4 additions and 3 deletions
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7
tutorials/shaders/shader_reference/spatial_shader.rst
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@@ -136,9 +136,10 @@ it manually with the following code:
Other built-ins, such as UV, UV2 and COLOR, are also passed through to the fragment function if not modified.
Users can override the modelview and projection transforms using the ``POSITION`` built-in. When ``POSITION`` is used,
the value from ``VERTEX`` is ignored and projection does not happen. However, the value passed to the fragment shader
still comes from ``VERTEX``.
Users can override the modelview and projection transforms using the ``POSITION`` built-in. If ``POSITION`` is written
to anywhere in the shader, it will always be used, so the user becomes responsible for ensuring that it always has
an acceptable value. When ``POSITION`` is used, the value from ``VERTEX`` is ignored and projection does not happen.
However, the value passed to the fragment shader still comes from ``VERTEX``.
For instancing, the INSTANCE_CUSTOM variable contains the instance custom data. When using particles, this information
is usually: