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Nibu e377d9f722 Background scene: two-pass WebGL2 terrain and world tree with login pull-back

Pass 1 sphere-traces CultMath noise terrain (fbm plus Phacelle erosion) and the
world tree with a conservative Lipschitz step, writing colour and depth. Pass 2
marches fog and clouds only up to that depth at low resolution with TAA. The
camera pulls back from the tree on login. Vendors CultLib's generated GLSL
(658c09e). The Phacelle gradient bound is an empirical probe, not a proof.
Headless harness compiles, renders and times it; nothing run on a GPU.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

2026-10-31 21:43:40 +00:00

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Scene harness

Compiles, renders and times the background scene (src/app/features/scene/) in headless Chromium. Not shipped, not run by CI.

node bundle.cjs <outdir>                  # esbuild bundle of entry.ts plus an index.html
node drive.cjs <outdir> compile           # compile and link each stage, JSON report
node drive.cjs <outdir> shots <pngdir>    # rest, mid pull-back and pulled-back screenshots
node drive.cjs <outdir> measure           # GPU time per pass by timer query, two viewports, two levels
node drive.cjs <outdir> variants          # the same with source patches (no erosion, no tree, value-only fbm)
node drive.cjs <outdir> phacelle          # the Phacelle gradient probe behind world.ts `phacelleGradBound`

Needs esbuild and playwright@1.48.2 on NODE_PATH and a Chromium. The first run was done on a host with no GPU, so drive.cjs launches with --use-angle=swiftshader (software Vulkan). On a machine with a GPU, remove those flags to measure the real device. bundle.cjs must run from a directory whose ancestors hold no empty package.json (esbuild reads them).

Timings from SwiftShader are CPU time: use them for the split between passes and for before and after of one change, never as a phone frame time.

1.2 KiB Raw Blame History

Scene harness

1.2 KiB

Raw Blame History