Fix light fringes beside plants, water grain and crooked traced shadows

[VLOD-ZDOV]

Light fringes beside plants and blocks

• The cloud-shadow "roof" march took any grass tuft or block within 12 blocks toward the sun for a ceiling and lifted the cloud's shade in that object's own sun-shadow. A hit now counts as a roof only when it is at least 2 blocks above the point and close behind the surface.
• The occlusion blur is now depth-aware, so it no longer averages silhouettes into the shaded ground beside them.
• Bloom no longer masks by a stale occlusion texture when whole-scene occlusion is on.

Water

• No per-pixel shadow jitter in the translucent pass, which is never frame-averaged.
• The scene copy under the water is sampled linearly.
• Waves fade out where they would alias.
• Reflections fade at the thickness limit instead of flipping between hit and miss.
• The water's tint thins out at the shore.

Traced shadows

• Faces are turned toward the eye rather than the feet. Uses a new eye field in the frame uniforms at offset 1024.
• Smaller lift off the surface, scaled by distance; foliage keeps the old lift because it sways.
• North- and south-facing walls now receive shadows.
• Spread rays no longer dip into their own surface.
• Built chunks near the camera but off screen stay in the top-level structure.
• Cross-shaped plants are masked out of shadow rays, so they no longer cast the square shadow of their quad.
• Creature shadows are shifted by the camera's motion since they were drawn.
• Cloud shadows are measured from the eye, at the height the game draws the clouds.

Build

• build.gradle passed glslangValidator a --target-spv flag it does not have. It now passes a second --target-env spirv1.4.

Testing

• Both SPIR-V variants of terrain.frag are rebuilt and pass spirv-val. All GL shaders pass tools/check-gl-shaders.py.
• vkimpl compiles against LWJGL 3.
• Nothing has been checked in-game yet.
• The ray-query variant grew about 3.8% overall. The code comments record a device loss at 7.4% growth in the translucent pipeline; most of the added code is dead there once the pipeline is specialised.

🤖 Generated with Claude Code

https://claude.ai/code/session_01XgyQ6udAHEtvknGZJzyhre

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Generated by Claude Code