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19c1f21610
The noise is evaluated at vec3(xz * f, c), so .z is the slope along the held constant axis. Confirmed numerically (harness/scene/gradAxis.cjs): analytic .xy matches central differences for fbm and phacelle, .z does not. Only the ray-march scene's normals were affected; the grid tier already used .xy. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> |
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