ExtrudeShape when use convertToFlatShade,ArcSide light is not good

Questions
1

like: Babylon.js Playground
In left, when i use leftShape and extrudeShape then convertToFlatShade,the arc side light is not good,
but in right, i modify leftShape to rightShape,then use extrudeShape and convertToUnIndexedMesh,the rightShapeMesh side light is good,
so when i went to us leftshape,the effect looks like rightShapeMesh,how to do?

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2

I am not sure to fully understand the question :frowning: Maybe @Evgeni_Popov would know ?

3

I didn’t understand neither. The left rendering is what is expected when using convertToFlatShadedMesh as each face/vertex will get its own normal that won’t be shared with other faces.

convertToUnIndexedMesh simply converts the mesh to an unindexed mesh, which does not impact how it is rendered.

4

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In picture, I want face 1 look like face 4, face 2 looks like face3,how to do?
In Left,each face has its own normal,but i want face 2 has its own normal,but face 1 shared with other faces to look like smooth effect(like face 4 effect)

5

Except by splitting the mesh into two meshes and applying convertToFlatShadedMesh to one of the mesh and not to the other, I don’t see how you can do it… Or you would need to create the normals yourself to achieve the rendering you want.