Is there any possibility to make this triangle red also from the bottom? I mean something like another light (from the bottom) in the scene but this light is only for specific objects. Or make this triangle without shadows I guess.
light.includedOnlyMeshesIds = ['myMeshId', 'another'];
Edit: This is also a plane, so the material would also have to turn back face culling off. Personally, think defuse material would be mt choice.
Alright, thanks. Also I updated the playground if anybody need it