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Material: document disabling depth test disables depth write caveat. #27000

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merged 1 commit into from Oct 18, 2023

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When setting the depthTest flag of a material to false, this will also implicitly disable the depth write, because glDisable(GL_DEPTH_TEST) is called internally.

See: https://www.khronos.org/opengl/wiki/Depth_Test

When depth testing is disabled, writes to the depth buffer are also disabled.

While the behavior makes sense I think (after all depthFunc can be used to achieve the desired behavior), it caught me off guard, so I thought it would make sense to document it.

When setting the `depthTest` flag of a material to false, this will also implicitly disable the depth write, because `glDisable(GL_DEPTH_TEST)` is called internally. 

See: https://www.khronos.org/opengl/wiki/Depth_Test
> When depth testing is disabled, writes to the depth buffer are also disabled. 

While the behavior makes sense I think (`depthFunc` can be used to achieve the desired behavior), it caught me off guard, so I thought it would make sense to document it.
@Mugen87 Mugen87 added this to the r158 milestone Oct 18, 2023
@Mugen87 Mugen87 merged commit b9081bb into mrdoob:dev Oct 18, 2023
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@fleroviux fleroviux deleted the patch-1 branch October 21, 2023 12:08
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2 participants