Illumination causes surfaces to transform

In my simple scene, I have a ground and an interesting light source. However, when the light hits certain meshes, it creates some strange effects. The shadows are being cast correctly, but the other meshes affected by the light are showing unusual results.

To see the issue in action, check out this online demo.

Here are screenshots depicting what's happening: https://i.sstatic.net/DGK9Y.png https://i.sstatic.net/bZTex.jpg

The black square on the ground and the black lights are created by the peculiar behavior of the light source.

javascriptgraphics3dthree.jslight

Answer â„–1

That object seems to be exhibiting symptoms of what is commonly referred to as "shadow acne". It's a frequent issue with shadow mapping that can usually be fixed by making slight adjustments to the shader responsible for handling shadow mapping.

If you're looking for a comprehensive guide on shadow mapping, I recommend checking out this resource. The guide offers two main solutions to address shadow acne:

  1. Rendering the shadow map using the back faces.
  2. Incorporating a bias into the occlusion test for fragments.

Implementing these solutions would require access to the fragment shaders in use.

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