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@Mugen87 Mugen87 commented Dec 8, 2025

Related issue: -

Description

The MRT readback is currently broken on dev for the WebGL backend.

WebGL: INVALID_OPERATION: Active draw buffers with missing fragment shader outputs.

The problem is that even when rendering to the readback render target, the MRT setting must be used otherwise the fragment shader outputs do not match render target's attachment state.

I'm not sure why this worked before but I assume the MRT state was incorrectly cached.

@sunag sunag added this to the r182 milestone Dec 8, 2025
@Mugen87 Mugen87 merged commit cea3fa4 into mrdoob:dev Dec 9, 2025
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2 participants