DisplayXR v2.18.3

[2.18.3] - 2026-09-04

Fixed

• The URP Basic Scene sample now ships a scene to open (#308, #310). Samples~/URPBasicScene/ had no .unity file while package.json called it "same content as Basic Scene"; following the README instead (empty scene + URPBasicSceneSetup) showed cubes in Play and an empty scene on Stop, which reads as a broken import. The root cause was that the sample's scripts had no committed .meta files, so their GUIDs were regenerated on every import and no committed scene could reference them — the same gap #261 closed for the BiRP sample. URPBasicScene.unity is BasicScene.unity with one line changed (the setup script's GUID), so camera settings and structure match by construction; both .meta files are added; the README's Quick Start opens the scene and says plainly that the content is runtime-built and Play-mode only. Contributed by Byungju Lee.
• The URP sample README no longer documents a projection fix that was removed in v2.2.0 (#309, #311). The "Off-axis projection fix" section described KooimaProjectionFixFeature and two menu items, none of which exist: the provider hands Unity a full per-eye projection matrix, so URP consumes the off-centre frustum natively and there is nothing to wire (and the feature must not come back — it would double-apply the projection). The section is deleted rather than rewritten, the HDRP paragraph loses its back-reference, and the June 2026 SPI experiment record is annotated. Contributed by Byungju Lee.