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Editorial Team
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Asked: 2026-06-11T12:58:29+00:00

I’ve been trying to use the THREE.ShaderUtils.lib[normal] normal mapping shader, but the lights are

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I’ve been trying to use the THREE.ShaderUtils.lib["normal"] normal mapping shader, but the lights are broken. The normal mapping itself works, but the lights appear to move crazily into weird positions when I look around or move the camera. Regular THREE.MeshPhongMaterial works. See pics below for illustration of the problem (the yellow circles are the actual positions of the lights).

Phong material works as expected:
Phong material works as expected

Normal map shader breaks things – you can see how the light is no longer emitted from the lights’ real position, but rather from somewhere random (those apparently random light places also move when viewport is moved):
Normal map shader breaks things

The geometry generation part is taken from the minecraft example (with geometry.computeTangents() added) and the normal map material generation from the normal map example.

What could be the reason for this behaviour?

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1 Answer

  1. Editorial Team

    I originally worked around this problem by using the r51dev version which has normalmapping in the phong material, but seems the dev branch has now also fixed the original normal map shader, most likely with this commit.

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