Fix WebXR video texture position transform (#32268)

[techcodie]

The Issue #32268

• Video textures in WebXR appear 90 degrees to the right of center in projection layers
• Affects mono/stereo video textures, requiring manual transforms to center them
• Longstanding problem affecting WebXR applications

The Solution

• Applies -90° Y-axis rotation to XR camera to correct video texture orientation
• Configurable via videoTextureCorrection flag (default: false, opt-in)
• Works for both WebGL and WebGPU renderers
• Zero performance overhead - simple quaternion multiplication

How It Fixes the Issue

• Users enable correction when needed: renderer.xr.videoTextureCorrection = true
• Video textures are centered in WebXR sessions when enabled
• Note: This rotates the entire camera, affecting all rendered content

Files Changed

• src/renderers/webxr/WebXRManager.js
• src/renderers/common/XRManager.js

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	356.28 86.49	356.5 86.56	+219 B +71 B
WebGPU	616.52 173.1	616.72 173.17	+195 B +63 B
WebGPU Nodes	615.13 172.85	615.32 172.92	+195 B +64 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	488.15 121.31	488.35 121.37	+197 B +56 B
WebGPU	688.76 189.02	688.95 189.08	+196 B +60 B
WebGPU Nodes	630.48 172.25	630.67 172.3	+196 B +58 B

[mrdoob]

Can you share a screenshot of the issue?