Hello,
I have a specific mesh (.stl) I’m trying to load where each face (Facet) is a specific but different color. I can see how to find the normals and the facets like this:
https://www.babylonjs-playground.com/#1YTZAC#29
I suppose I could change the length of the normals and colors but I’d really just like to color the facet. I cannot color the vertex because this creates a multi-colored facet and isn’t what I need.
Any help/guidance would be appreciated.
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The reason for this is facets sharing vertices. See
https://doc.babylonjs.com/resources/facets
https://doc.babylonjs.com/resources/normals
The most straight forward way to separate facets is to use
mesh.convertToFlatShadedMesh()
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Example of coloring facets https://www.babylonjs-playground.com/#1YTZAC#32
By the way it seems that on icosphere is already flat shaded https://www.babylonjs-playground.com/#1YTZAC#33
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Cool! Even a non-flat-shaded flat-shaded. (huh?)
Line 15 flat: false and no convert-to. How do they do that? 
It’s like the multiple lighting normals at each point… are direction-averaged and all get set to the averaged direction. See the difference in the specular of the light. interesting, huh?
In PG #35, each white “normals” line… is actually 6 normals/lines… averaged. Set line 15 flat: true, and see all 6 in un-averaged (un-summed?) form. Cool.
Thx for the per-face colors, John… very nice.
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This is really great! Thank you so much for putting this together.