Emil
c7e86663d8
MVP checks / mvp (push) Waiting to run
Add shared Rust/WASM physics, worker meshing and diagnostics, 64-chunk full-height streaming, atlas texture support, and baseline world import. Document the current implementation and include the supplied in-game lobby screenshot.
26 lines
1.0 KiB
JavaScript
26 lines
1.0 KiB
JavaScript
/** Directional orthographic projection, snapped in light space to avoid crawling shadows. */
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export function shadowFrame(eye, sun, resolution = 2048, radius = 48) {
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const length = Math.hypot(...sun),
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z = sun.map((v) => v / length),
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horizontal = Math.hypot(z[0], z[2]),
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x = horizontal > 1e-6 ? [z[2] / horizontal, 0, -z[0] / horizontal] : [1, 0, 0],
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y = [z[1] * x[2] - z[2] * x[1], z[2] * x[0] - z[0] * x[2], z[0] * x[1] - z[1] * x[0]],
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dot = (a, b) => a.reduce((sum, v, i) => sum + v * b[i], 0),
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texel = 2 * radius / resolution,
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sx = Math.round(dot(x, eye) / texel) * texel,
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sy = Math.round(dot(y, eye) / texel) * texel,
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sz = dot(z, eye),
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depth = radius * 2,
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center = eye.map((_, i) => x[i] * sx + y[i] * sy + z[i] * sz);
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return {
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center,
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radius,
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matrix: new Float32Array([
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x[0] / radius, y[0] / radius, -z[0] / depth, 0,
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x[1] / radius, y[1] / radius, -z[1] / depth, 0,
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x[2] / radius, y[2] / radius, -z[2] / depth, 0,
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-sx / radius, -sy / radius, sz / depth, 1,
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]),
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};
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}
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