UniformsGroup: Fix incorrect index in Vector4 dirty check

[Mridul012]

Summary

Fixes an incorrect index used in the dirty check of UniformsGroup.updateVector4.

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Problem

The current implementation compares the w component using an incorrect offset:

a[ offset + 4 ] !== v.w

However, the corresponding write uses:

a[ offset + 3 ] = v.w

This mismatch causes the dirty check to read from the wrong position.

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Impact

When only the w component changes:

• The dirty check may incorrectly pass
• The value is not updated
• Results in stale data being used during rendering

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Fix

Correct the index used in the comparison:

a[ offset + 3 ] !== v.w

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Notes

• Minimal fix (1 character change)
• No impact on bundle size
• Fixes a silent rendering issue

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	360.01 85.46	360.01 85.46	+0 B +0 B
WebGPU	633.38 175.63	633.38 175.63	+0 B -1 B
WebGPU Nodes	631.5 175.34	631.5 175.33	+0 B -1 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	492.21 120.03	492.21 120.03	+0 B +0 B
WebGPU	705.41 190.51	705.41 190.51	+0 B -1 B
WebGPU Nodes	654.63 177.77	654.63 177.77	+0 B -1 B