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node_modules/three/examples/jsm/objects/GroundProjectedSkybox.js

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+import { Mesh, IcosahedronGeometry, ShaderMaterial, DoubleSide } from 'three';
+
+/**
+ * Ground projected env map adapted from @react-three/drei.
+ * https://github.com/pmndrs/drei/blob/master/src/core/Environment.tsx
+ */
+class GroundProjectedSkybox extends Mesh {
+
+	constructor( texture, options = {} ) {
+
+		const isCubeMap = texture.isCubeTexture;
+
+		const defines = [
+			isCubeMap ? '#define ENVMAP_TYPE_CUBE' : ''
+		];
+
+		const vertexShader = /* glsl */ `
+			varying vec3 vWorldPosition;
+
+			void main() {
+
+				vec4 worldPosition = ( modelMatrix * vec4( position, 1.0 ) );
+				vWorldPosition = worldPosition.xyz;
+
+				gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+			}
+			`;
+		const fragmentShader = defines.join( '\n' ) + /* glsl */ `
+
+				varying vec3 vWorldPosition;
+
+				uniform float radius;
+				uniform float height;
+				uniform float angle;
+
+				#ifdef ENVMAP_TYPE_CUBE
+
+					uniform samplerCube map;
+
+				#else
+
+					uniform sampler2D map;
+
+				#endif
+
+				// From: https://www.shadertoy.com/view/4tsBD7
+				float diskIntersectWithBackFaceCulling( vec3 ro, vec3 rd, vec3 c, vec3 n, float r ) 
+				{
+
+					float d = dot ( rd, n );
+
+					if( d > 0.0 ) { return 1e6; }
+
+					vec3 o = ro - c;
+					float t = - dot( n, o ) / d;
+					vec3 q = o + rd * t;
+
+					return ( dot( q, q ) < r * r ) ? t : 1e6;
+
+				}
+
+				// From: https://www.iquilezles.org/www/articles/intersectors/intersectors.htm
+				float sphereIntersect( vec3 ro, vec3 rd, vec3 ce, float ra ) {
+
+					vec3 oc = ro - ce;
+					float b = dot( oc, rd );
+					float c = dot( oc, oc ) - ra * ra;
+					float h = b * b - c;
+
+					if( h < 0.0 ) { return -1.0; }
+
+					h = sqrt( h );
+
+					return - b + h;
+
+				}
+
+				vec3 project() {
+
+					vec3 p = normalize( vWorldPosition );
+					vec3 camPos = cameraPosition;
+					camPos.y -= height;
+
+					float intersection = sphereIntersect( camPos, p, vec3( 0.0 ), radius );
+					if( intersection > 0.0 ) {
+
+						vec3 h = vec3( 0.0, - height, 0.0 );
+						float intersection2 = diskIntersectWithBackFaceCulling( camPos, p, h, vec3( 0.0, 1.0, 0.0 ), radius );
+						p = ( camPos + min( intersection, intersection2 ) * p ) / radius;
+
+					} else {
+
+						p = vec3( 0.0, 1.0, 0.0 );
+
+					}
+
+					return p;
+
+				}
+
+				#include <common>
+
+				void main() {
+
+					vec3 projectedWorldPosition = project();
+
+					#ifdef ENVMAP_TYPE_CUBE
+
+						vec3 outcolor = textureCube( map, projectedWorldPosition ).rgb;
+
+					#else
+
+						vec3 direction = normalize( projectedWorldPosition );
+						vec2 uv = equirectUv( direction );
+						vec3 outcolor = texture2D( map, uv ).rgb;
+
+					#endif
+
+					gl_FragColor = vec4( outcolor, 1.0 );
+
+					#include <tonemapping_fragment>
+					#include <colorspace_fragment>
+
+				}
+				`;
+
+		const uniforms = {
+			map: { value: texture },
+			height: { value: options.height || 15 },
+			radius: { value: options.radius || 100 },
+		};
+
+		const geometry = new IcosahedronGeometry( 1, 16 );
+		const material = new ShaderMaterial( {
+			uniforms,
+			fragmentShader,
+			vertexShader,
+			side: DoubleSide,
+		} );
+
+		super( geometry, material );
+
+	}
+
+	set radius( radius ) {
+
+		this.material.uniforms.radius.value = radius;
+
+	}
+
+	get radius() {
+
+		return this.material.uniforms.radius.value;
+
+	}
+
+	set height( height ) {
+
+		this.material.uniforms.height.value = height;
+
+	}
+
+	get height() {
+
+		return this.material.uniforms.height.value;
+
+	}
+
+}
+
+export { GroundProjectedSkybox };