Fix sky and clouds orientation for Z-up world coordinates

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Skybox: replace sphere-mesh approach with a fullscreen triangle that
reconstructs the world-space ray direction analytically via inverse
projection/view matrices. Eliminates clip.w=0 degeneracy at the horizon
and correctly maps altitude to dir.z in the Z-up coordinate system.

Clouds: hemisphere mesh was storing altitude in aPos.y (Y-up convention);
the Z-up view matrix projected this sideways, making clouds appear
vertical. Store altitude in aPos.z and update the fragment shader to
read dir.z as altitude and dir.xy as the horizontal UV plane.

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This commit is contained in:

Kelsi 2026-02-21 21:57:16 -08:00

parent 69cf39ba02

commit 4fc3689dcc

9 changed files with 39 additions and 155 deletions

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