After creating a custom geometry and successfully using geometry.computeFaceNormals() to achieve correct lighting, I encountered an issue when attempting to animate the geometry. Even though I call geometry.computeFaceNormals() within the animation loop, the faces' lighting remains unchanged.
To see an example of this issue, check out this fiddle:
When making changes to the vertices of your geometry, it is important to also update the normals for proper shading results.
However, if you are aiming for flat shading, there is a different approach that can be taken.
The MeshPhongMaterial is capable of producing flat shading with the help of the OES_standard_derivatives extension. This means that there is no need to specify or update geometry normals when vertex modifications occur.
By simply utilizing the provided pattern below, flat shading will function seamlessly - granted that the extension is supported.
var material = new THREE.MeshPhongMaterial( {
color: 0xFFFFFF,
shading: THREE.FlatShading
} );
Version used: three.js r.80
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