51 lines
1.4 KiB
JavaScript
51 lines
1.4 KiB
JavaScript
import { Mesh, MeshBasicMaterial, SphereGeometry, Vector3 } from 'three';
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/**
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* A ground-projected skybox. The height is how far the camera that took the photo was above the ground -
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* a larger value will magnify the downward part of the image. By default the object is centered at the camera,
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* so it is often helpful to set skybox.position.y = height to put the ground at the origin. Set the radius
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* large enough to ensure your user's camera stays inside.
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*/
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class GroundedSkybox extends Mesh {
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constructor( map, height, radius, resolution = 128 ) {
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if ( height <= 0 || radius <= 0 || resolution <= 0 ) {
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throw new Error( 'GroundedSkybox height, radius, and resolution must be positive.' );
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}
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const geometry = new SphereGeometry( radius, 2 * resolution, resolution );
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geometry.scale( 1, 1, -1 );
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const pos = geometry.getAttribute( 'position' );
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const tmp = new Vector3();
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for ( let i = 0; i < pos.count; ++ i ) {
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tmp.fromBufferAttribute( pos, i );
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if ( tmp.y < 0 ) {
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// Smooth out the transition from flat floor to sphere:
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const y1 = - height * 3 / 2;
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const f =
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tmp.y < y1 ? - height / tmp.y : ( 1 - tmp.y * tmp.y / ( 3 * y1 * y1 ) );
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tmp.multiplyScalar( f );
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tmp.toArray( pos.array, 3 * i );
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}
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}
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pos.needsUpdate = true;
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super( geometry, new MeshBasicMaterial( { map, depthWrite: false } ) );
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}
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}
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export { GroundedSkybox };
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