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46 lines
1.5 KiB
TypeScript
46 lines
1.5 KiB
TypeScript
import * as THREE from 'three';
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/** Supersample low-DPI GPU displays too; software WebGL keeps its latency budget. */
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export function viewerPixelRatio(dpr: number, software: boolean): number {
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const ratio = Number.isFinite(dpr) && dpr > 0 ? dpr : 1;
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return software ? Math.min(ratio, 1.75) : Math.min(Math.max(ratio, 1.5), 2);
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}
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/** Fit shadow texels to the loaded scene instead of a default 10 m / 512 px map. */
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export function fitSceneShadow(
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light: THREE.DirectionalLight,
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center: readonly number[],
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extent: number,
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): void {
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const radius = Math.max(1, extent);
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light.target.position.set(center[0], center[1], center[2]);
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light.position
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.set(4, -3, 7)
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.normalize()
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.multiplyScalar(radius * 2)
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.add(light.target.position);
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const shadow = light.shadow;
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shadow.mapSize.set(2048, 2048);
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Object.assign(shadow.camera, {
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left: -radius,
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right: radius,
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top: radius,
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bottom: -radius,
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near: radius * 0.01,
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far: radius * 4,
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});
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shadow.bias = -0.00005;
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shadow.normalBias = radius / 4096;
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shadow.camera.updateProjectionMatrix();
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shadow.needsUpdate = true;
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}
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/** DataTexture defaults to nearest-neighbour; oblique camera views need mipmaps. */
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export function filterSurfaceTexture(texture: THREE.DataTexture, maxAnisotropy: number): void {
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texture.magFilter = THREE.LinearFilter;
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texture.minFilter = THREE.LinearMipmapLinearFilter;
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texture.generateMipmaps = true;
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texture.anisotropy = Math.min(8, maxAnisotropy);
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texture.needsUpdate = true;
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}
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