Claude 80b9aacea7 G1: Turbulent Displace Evolution changes the output (#943) ...

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

2026-10-27 15:34:34 -05:00

..

src

G1: Turbulent Displace Evolution changes the output (#943)

2026-10-27 15:34:34 -05:00

Cargo.toml

fix: contain GPU initialization and retire failed readbacks

2026-10-06 16:40:12 -05:00