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{"version":3,"file":"Refractor.cjs","sources":["../../src/objects/Refractor.js"],"sourcesContent":["import {\n Color,\n Matrix4,\n Mesh,\n PerspectiveCamera,\n Plane,\n Quaternion,\n ShaderMaterial,\n UniformsUtils,\n Vector3,\n Vector4,\n WebGLRenderTarget,\n NoToneMapping,\n HalfFloatType,\n} from 'three'\nimport { version } from '../_polyfill/constants'\n\nconst Refractor = /* @__PURE__ */ (() => {\n class Refractor extends Mesh {\n static RefractorShader = {\n uniforms: {\n color: {\n value: null,\n },\n\n tDiffuse: {\n value: null,\n },\n\n textureMatrix: {\n value: null,\n },\n },\n\n vertexShader: /* glsl */ `\n\n\t\tuniform mat4 textureMatrix;\n\n\t\tvarying vec4 vUv;\n\n\t\tvoid main() {\n\n\t\t\tvUv = textureMatrix * vec4( position, 1.0 );\n\t\t\tgl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );\n\n\t\t}`,\n\n fragmentShader: /* glsl */ `\n\n\t\tuniform vec3 color;\n\t\tuniform sampler2D tDiffuse;\n\n\t\tvarying vec4 vUv;\n\n\t\tfloat blendOverlay( float base, float blend ) {\n\n\t\t\treturn( base < 0.5 ? ( 2.0 * base * blend ) : ( 1.0 - 2.0 * ( 1.0 - base ) * ( 1.0 - blend ) ) );\n\n\t\t}\n\n\t\tvec3 blendOverlay( vec3 base, vec3 blend ) {\n\n\t\t\treturn vec3( blendOverlay( base.r, blend.r ), blendOverlay( base.g, blend.g ), blendOverlay( base.b, blend.b ) );\n\n\t\t}\n\n\t\tvoid main() {\n\n\t\t\tvec4 base = texture2DProj( tDiffuse, vUv );\n\t\t\tgl_FragColor = vec4( blendOverlay( base.rgb, color ), 1.0 );\n\n\t\t\t#include <tonemapping_fragment>\n\t\t\t#include <${version >= 154 ? 'colorspace_fragment' : 'encodings_fragment'}>\n\n\t\t}`,\n }\n\n constructor(geometry, options = {}) {\n super(geometry)\n\n this.isRefractor = true\n\n this.type = 'Refractor'\n this.camera = new PerspectiveCamera()\n\n const scope = this\n\n const color = options.color !== undefined ? new Color(options.color) : new Color(0x7f7f7f)\n const textureWidth = options.textureWidth || 512\n const textureHeight = options.textureHeight || 512\n const clipBias = options.clipBias || 0\n const shader = options.shader || Refractor.RefractorShader\n const multisample = options.multisample !== undefined ? options.multisample : 4\n\n //\n\n const virtualCamera = this.camera\n virtualCamera.matrixAutoUpdate = false\n virtualCamera.userData.refractor = true\n\n //\n\n const refractorPlane = new Plane()\n const textureMatrix = new Matrix4()\n\n // render target\n\n const renderTarget = new WebGLRenderTarget(textureWidth, textureHeight, {\n samples: multisample,\n type: HalfFloatType,\n })\n\n // material\n\n this.material = new ShaderMaterial({\n uniforms: UniformsUtils.clone(shader.uniforms),\n vertexShader: shader.vertexShader,\n fragmentShader: shader.fragmentShader,\n transparent: true, // ensures, refractors are drawn from farthest to closest\n })\n\n this.material.uniforms['color'].value = color\n this.material.uniforms['tDiffuse'].value = renderTarget.texture\n this.material.uniforms['textureMatrix'].value = textureMatrix\n\n // functions\n\n const visible = (function () {\n const refractorWorldPosition = new Vector3()\n const cameraWorldPosition = new Vector3()\n const rotationMatrix = new Matrix4()\n\n const view = new Vector3()\n const normal = new Vector3()\n\n return function visible(camera) {\n refractorWorldPosition.setFromMatrixPosition(scope.matrixWorld)\n cameraWorldPosition.setFromMatrixPosition(camera.matrixWorld)\n\n view.subVectors(refractorWorldPosition, cameraWorldPosition)\n\n rotationMatrix.extractRotation(scope.matrixWorld)\n\n normal.set(0, 0, 1)\n normal.applyMatrix4(rotationMatrix)\n\n return view.dot(normal) < 0\n }\n })()\n\n const updateRefractorPlane = (function () {\n const normal = new Vector3()\n const position = new Vector3()\n const quaternion = new Quaternion()\n const scale = new Vector3()\n\n return function updateRefractorPlane() {\n scope.matrixWorld.decompose(position, quaternion, scale)\n normal.set(0, 0, 1).applyQuaternion(quaternion).normalize()\n\n // flip the normal because we want to cull everything above the plane\n\n normal.negate()\n\n refractorPlane.setFromNormalAndCoplanarPoint(normal, position)\n }\n })()\n\n const updateVirtualCamera = (function () {\n const clipPlane = new Plane()\n const clipVector = new Vector4()\n const q = new Vector4()\n\n return function updateVirtualCamera(camera) {\n virtualCamera.matrixWorld.copy(camera.matrixWorld)\n virtualCamera.matrixWorldInverse.copy(virtualCamera.matrixWorld).invert()\n virtualCamera.projectionMatrix.copy(camera.projectionMatrix)\n virtualCamera.far = camera.far // used in WebGLBackground\n\n // The following code creates an oblique view frustum for clipping.\n // see: Lengyel, Eric. “Oblique View Frustum Depth Projection and Clipping”.\n // Journal of Game Development, Vol. 1, No. 2 (2005), Charles River Media, pp. 5–16\n\n clipPlane.copy(refractorPlane)\n clipPlane.applyMatrix4(virtualCamera.matrixWorldInverse)\n\n clipVector.set(clipPlane.normal.x, clipPlane.normal.y, clipPlane.normal.z, clipPlane.constant)\n\n // calculate the clip-space corner point opposite the clipping plane and\n // transform it into camera space by multiplying it by the inverse of the projection matrix\n\n const projectionMatrix = virtualCamera.projectionMatrix\n\n q.x = (Math.sign(clipVector.x) + projectionMatrix.elements[8]) / projectionMatrix.elements[0]\n q.y = (Math.sign(clipVector.y) + projectionMatrix.elements[9]) / projectionMatrix.elements[5]\n q.z = -1.0\n q.w = (1.0 + projectionMatrix.elements[10]) / projectionMatrix.elements[14]\n\n // calculate the scaled plane vector\n\n clipVector.multiplyScalar(2.0 / clipVector.dot(q))\n\n // replacing the third row of the projection matrix\n\n projectionMatrix.elements[2] = clipVector.x\n projectionMatrix.elements[6] = clipVector.y\n projectionMatrix.elements[10] = clipVector.z + 1.0 - clipBias\n projectionMatrix.elements[14] = clipVector.w\n }\n })()\n\n // This will update the texture matrix that is used for projective texture mapping in the shader.\n // see: http://developer.download.nvidia.com/assets/gamedev/docs/projective_texture_mapping.pdf\n\n function updateTextureMatrix(camera) {\n // this matrix does range mapping to [ 0, 1 ]\n\n textureMatrix.set(0.5, 0.0, 0.0, 0.5, 0.0, 0.5, 0.0, 0.5, 0.0, 0.0, 0.5, 0.5, 0.0, 0.0, 0.0, 1.0)\n\n // we use \"Object Linear Texgen\", so we need to multiply the texture matrix T\n // (matrix above) with the projection and view matrix of the virtual camera\n // and the model matrix of the refractor\n\n textureMatrix.multiply(camera.projectionMatrix)\n textureMatrix.multiply(camera.matrixWorldInverse)\n textureMatrix.multiply(scope.matrixWorld)\n }\n\n //\n\n function render(renderer, scene, camera) {\n scope.visible = false\n\n const currentRenderTarget = renderer.getRenderTarget()\n const currentXrEnabled = renderer.xr.enabled\n const currentShadowAutoUpdate = renderer.shadowMap.autoUpdate\n const currentToneMapping = renderer.toneMapping\n\n let isSRGB = false\n if ('outputColorSpace' in renderer) isSRGB = renderer.outputColorSpace === 'srgb'\n else isSRGB = renderer.outputEncoding === 3001 // sRGBEncoding\n\n renderer.xr.enabled = false // avoid camera modification\n renderer.shadowMap.autoUpdate = false // avoid re-computing shadows\n if ('outputColorSpace' in renderer) renderer.outputColorSpace = 'srgb-linear'\n else renderer.outputEncoding = 3000 // LinearEncoding\n renderer.toneMapping = NoToneMapping\n\n renderer.setRenderTarget(renderTarget)\n if (renderer.autoClear === false) renderer.clear()\n renderer.render(scene, virtualCamera)\n\n renderer.xr.enabled = currentXrEnabled\n renderer.shadowMap.autoUpdate = currentShadowAutoUpdate\n renderer.toneMapping = currentToneMapping\n renderer.setRenderTarget(currentRenderTarget)\n\n if ('outputColorSpace' in renderer) renderer.outputColorSpace = isSRGB ? 'srgb' : 'srgb-linear'\n else renderer.outputEncoding = isSRGB ? 3001 : 3000\n\n // restore viewport\n\n const viewport = camera.viewport\n\n if (viewport !== undefined) {\n renderer.state.viewport(viewport)\n }\n\n scope.visible = true\n }\n\n //\n\n this.onBeforeRender = function (renderer, scene, camera) {\n // ensure refractors are rendered only once per frame\n\n if (camera.userData.refractor === true) return\n\n // avoid rendering when the refractor is viewed from behind\n\n if (!visible(camera) === true) return\n\n // update\n\n updateRefractorPlane()\n\n updateTextureMatrix(camera)\n\n updateVirtualCamera(camera)\n\n render(renderer, scene, camera)\n }\n\n this.getRenderTarget = function () {\n return renderTarget\n }\n\n this.dispose = function () {\n renderTarget.dispose()\n scope.material.dispose()\n }\n }\n }\n\n return Refractor\n})()\n\nexport { Refractor 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