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render3d/wind: trees bend a few per cent, branches move as one piece, the flutter is slower across a crown

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The user's play found the aspens' branches swinging like rope. Three terms:
- the whole-tree bend reached 22% of the tree's height at a gust's top (three
  metres on a 14 m aspen); 4.5% now, and the side-to-side part at a quarter of
  that and slower;
- a branch term: nothing within 0.35 m of the trunk, growing with the distance
  out, phased by the direction the branch leaves the trunk (constant along a
  branch, so it moves as one piece and its neighbours are out of step);
- the aspen's leaf flutter took its phase from each vertex at eleven radians a
  metre, which bent every twig along its length; about three now, and half the
  amplitude.

Measured on the lab's `aspen` view (10-frame bursts, crowns only, same binary
with the old and new SPIR-V): pixels moving more than 8 over ten frames 16.8%
-> 9.7%, frame to frame 4.4% -> 2.1%. SPIR-V rebuilt with `ludic-dev shaders`
(vertex stages only; the manifest is unchanged).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-29 12:16:11 +03:00
parent 28ad6f62ea
commit 3a2d594626
14 changed files with 22 additions and 6 deletions
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