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Many thanks to the original Author of this patch: Christian Aguilera The COLLADA importer was silently ignoring the alpha component in the vertex data. The `stride` variable holds the component count (3 for RGB; 4 for RGBA), and can be used for honouring the alpha channel in the vertex data. Test plan: - Open Blender. - Clear the scene. - Add a plane. - Enter **Vertex Paint** mode. - Switch to the **Erase Alpha** blending mode. - Select a tone of gray. - Turn strength down to less than 1 - Paint [some of] the vertices of the plane. - Export project as a COLLADA file (`.dae`). - Clear the scene. - Re-import the COLLADA file again. - Export the project again (with different name). **Without** this patch, the second exported project will have lost the alpha component in their vertex data: ```lang=xml, counterexample <float_array id="Plane-mesh-colors-Col-array" count="24">1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1</float_array> ``` **With** the patch, the first and the second exported projects retain the alpha values painted previously: ```lang=xml <float_array id="Plane-mesh-colors-Col-array" count="24">1 1 1 1 1 1 1 0.5490196 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0.5490196</float_array> ``` Reviewed By: cristian64, SonnyCampbell_Unity Authored by: Christian Aguilera Differential Revision: https://developer.blender.org/D14246
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