3d-wood-material

1# 3D Wood Material
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3**Mechanism:** one small periodic noise field, mip-filtered, is read at several different stretches and scales inside the fragment shader, so ring position, latewood, pores, fibres, rays and tool marks all come from the same wandering grain and feed colour, roughness and relief together, each fading out by its own screen footprint.
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5Boundary. This skill is the wood surface itself. For whole-scene light, rays and scoring wood renders, use `3d-wood-lighting-scorecard`. For image-based PBR sets (downloaded maps, texel budgets, KTX2 delivery) use `3d-high-resolution-textures`; reach for it when you need a photographed or scanned species. For silhouette, bevel and LOD geometry use `3d-high-poly-models`; this skill only needs a rounded arris (below). Cloth, metal and paper have their own siblings.
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7Run `demo.html` first (Kibori bench, four species, four finishes, macro views, and a switch that swaps in the failure). `PROMPT.md` recreates it.
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9## Recipe
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