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Claude
80b9aacea7
Turbulent Displace read its noise through value_noise, whose quintic fade also eased the evolution axis. Near every whole revolution the pattern hardly moved: Evolution 0 and 37 degrees (or 360 and 400) differed by well under a hundredth of the frame, so different Evolution values looked identical, and the motion sped up and slowed down within each revolution (the #1816 symptom). Add value_noise_linear_z (x and y keep the fade, z is linear) on the CPU and in the WGSL kernels and use it for Turbulent Displace on both paths. value_noise is unchanged, so the other effects and the pinned simulation goldens are unaffected. Tests: CPU test that non-equivalent Evolution values (fractional, past 360, past 720) all differ and that Cycle Evolution still matches 0/360; unit test of the linear z axis; GPU-vs-CPU cases at small and large Evolution. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FYXhNN7W7nB6sKjwwU7CDM