{"version":3,"file":"DecalGeometry.cjs","sources":["../../src/geometries/DecalGeometry.js"],"sourcesContent":["import { BufferGeometry, Float32BufferAttribute, Matrix4, Vector3 } from 'three'\n\n/**\n * You can use this geometry to create a decal mesh, that serves different kinds of purposes.\n * e.g. adding unique details to models, performing dynamic visual environmental changes or covering seams.\n *\n * Constructor parameter:\n *\n * mesh — Any mesh object\n * position — Position of the decal projector\n * orientation — Orientation of the decal projector\n * size — Size of the decal projector\n *\n * reference: http://blog.wolfire.com/2009/06/how-to-project-decals/\n *\n */\n\nclass DecalGeometry extends BufferGeometry {\n  constructor(mesh, position, orientation, size) {\n    super()\n\n    // buffers\n\n    const vertices = []\n    const normals = []\n    const uvs = []\n\n    // helpers\n\n    const plane = new Vector3()\n\n    // this matrix represents the transformation of the decal projector\n\n    const projectorMatrix = new Matrix4()\n    projectorMatrix.makeRotationFromEuler(orientation)\n    projectorMatrix.setPosition(position)\n\n    const projectorMatrixInverse = new Matrix4()\n    projectorMatrixInverse.copy(projectorMatrix).invert()\n\n    // generate buffers\n\n    generate()\n\n    // build geometry\n\n    this.setAttribute('position', new Float32BufferAttribute(vertices, 3))\n    this.setAttribute('normal', new Float32BufferAttribute(normals, 3))\n    this.setAttribute('uv', new Float32BufferAttribute(uvs, 2))\n\n    function generate() {\n      let i\n\n      let decalVertices = []\n\n      const vertex = new Vector3()\n      const normal = new Vector3()\n\n      // handle different geometry types\n\n      if (mesh.geometry.isGeometry === true) {\n        console.error('THREE.DecalGeometry no longer supports THREE.Geometry. Use BufferGeometry instead.')\n        return\n      }\n\n      const geometry = mesh.geometry\n\n      const positionAttribute = geometry.attributes.position\n      const normalAttribute = geometry.attributes.normal\n\n      // first, create an array of 'DecalVertex' objects\n      // three consecutive 'DecalVertex' objects represent a single face\n      //\n      // this data structure will be later used to perform the clipping\n\n      if (geometry.index !== null) {\n        // indexed BufferGeometry\n\n        const index = geometry.index\n\n        for (i = 0; i < index.count; i++) {\n          vertex.fromBufferAttribute(positionAttribute, index.getX(i))\n          normal.fromBufferAttribute(normalAttribute, index.getX(i))\n\n          pushDecalVertex(decalVertices, vertex, normal)\n        }\n      } else {\n        // non-indexed BufferGeometry\n\n        for (i = 0; i < positionAttribute.count; i++) {\n          vertex.fromBufferAttribute(positionAttribute, i)\n          normal.fromBufferAttribute(normalAttribute, i)\n\n          pushDecalVertex(decalVertices, vertex, normal)\n        }\n      }\n\n      // second, clip the geometry so that it doesn't extend out from the projector\n\n      decalVertices = clipGeometry(decalVertices, plane.set(1, 0, 0))\n      decalVertices = clipGeometry(decalVertices, plane.set(-1, 0, 0))\n      decalVertices = clipGeometry(decalVertices, plane.set(0, 1, 0))\n      decalVertices = clipGeometry(decalVertices, plane.set(0, -1, 0))\n      decalVertices = clipGeometry(decalVertices, plane.set(0, 0, 1))\n      decalVertices = clipGeometry(decalVertices, plane.set(0, 0, -1))\n\n      // third, generate final vertices, normals and uvs\n\n      for (i = 0; i < decalVertices.length; i++) {\n        const decalVertex = decalVertices[i]\n\n        // create texture coordinates (we are still in projector space)\n\n        uvs.push(0.5 + decalVertex.position.x / size.x, 0.5 + decalVertex.position.y / size.y)\n\n        // transform the vertex back to world space\n\n        decalVertex.position.applyMatrix4(projectorMatrix)\n\n        // now create vertex and normal buffer data\n\n        vertices.push(decalVertex.position.x, decalVertex.position.y, decalVertex.position.z)\n        normals.push(decalVertex.normal.x, decalVertex.normal.y, decalVertex.normal.z)\n      }\n    }\n\n    function pushDecalVertex(decalVertices, vertex, normal) {\n      // transform the vertex to world space, then to projector space\n\n      vertex.applyMatrix4(mesh.matrixWorld)\n      vertex.applyMatrix4(projectorMatrixInverse)\n\n      normal.transformDirection(mesh.matrixWorld)\n\n      decalVertices.push(new DecalVertex(vertex.clone(), normal.clone()))\n    }\n\n    function clipGeometry(inVertices, plane) {\n      const outVertices = []\n\n      const s = 0.5 * Math.abs(size.dot(plane))\n\n      // a single iteration clips one face,\n      // which consists of three consecutive 'DecalVertex' objects\n\n      for (let i = 0; i < inVertices.length; i += 3) {\n        let v1Out,\n          v2Out,\n          v3Out,\n          total = 0\n        let nV1, nV2, nV3, nV4\n\n        const d1 = inVertices[i + 0].position.dot(plane) - s\n        const d2 = inVertices[i + 1].position.dot(plane) - s\n        const d3 = inVertices[i + 2].position.dot(plane) - s\n\n        v1Out = d1 > 0\n        v2Out = d2 > 0\n        v3Out = d3 > 0\n\n        // calculate, how many vertices of the face lie outside of the clipping plane\n\n        total = (v1Out ? 1 : 0) + (v2Out ? 1 : 0) + (v3Out ? 1 : 0)\n\n        switch (total) {\n          case 0: {\n            // the entire face lies inside of the plane, no clipping needed\n\n            outVertices.push(inVertices[i])\n            outVertices.push(inVertices[i + 1])\n            outVertices.push(inVertices[i + 2])\n            break\n          }\n\n          case 1: {\n            // one vertex lies outside of the plane, perform clipping\n\n            if (v1Out) {\n              nV1 = inVertices[i + 1]\n              nV2 = inVertices[i + 2]\n              nV3 = clip(inVertices[i], nV1, plane, s)\n              nV4 = clip(inVertices[i], nV2, plane, s)\n            }\n\n            if (v2Out) {\n              nV1 = inVertices[i]\n              nV2 = inVertices[i + 2]\n              nV3 = clip(inVertices[i + 1], nV1, plane, s)\n              nV4 = clip(inVertices[i + 1], nV2, plane, s)\n\n              outVertices.push(nV3)\n              outVertices.push(nV2.clone())\n              outVertices.push(nV1.clone())\n\n              outVertices.push(nV2.clone())\n              outVertices.push(nV3.clone())\n              outVertices.push(nV4)\n              break\n            }\n\n            if (v3Out) {\n              nV1 = inVertices[i]\n              nV2 = inVertices[i + 1]\n              nV3 = clip(inVertices[i + 2], nV1, plane, s)\n              nV4 = clip(inVertices[i + 2], nV2, plane, s)\n            }\n\n            outVertices.push(nV1.clone())\n            outVertices.push(nV2.clone())\n            outVertices.push(nV3)\n\n            outVertices.push(nV4)\n            outVertices.push(nV3.clone())\n            outVertices.push(nV2.clone())\n\n            break\n          }\n\n          case 2: {\n            // two vertices lies outside of the plane, perform clipping\n\n            if (!v1Out) {\n              nV1 = inVertices[i].clone()\n              nV2 = clip(nV1, inVertices[i + 1], plane, s)\n              nV3 = clip(nV1, inVertices[i + 2], plane, s)\n              outVertices.push(nV1)\n              outVertices.push(nV2)\n              outVertices.push(nV3)\n            }\n\n            if (!v2Out) {\n              nV1 = inVertices[i + 1].clone()\n              nV2 = clip(nV1, inVertices[i + 2], plane, s)\n              nV3 = clip(nV1, inVertices[i], plane, s)\n              outVertices.push(nV1)\n              outVertices.push(nV2)\n              outVertices.push(nV3)\n            }\n\n            if (!v3Out) {\n              nV1 = inVertices[i + 2].clone()\n              nV2 = clip(nV1, inVertices[i], plane, s)\n              nV3 = clip(nV1, inVertices[i + 1], plane, s)\n              outVertices.push(nV1)\n              outVertices.push(nV2)\n              outVertices.push(nV3)\n            }\n\n            break\n          }\n\n          case 3: {\n            // the entire face lies outside of the plane, so let's discard the corresponding vertices\n\n            break\n          }\n        }\n      }\n\n      return outVertices\n    }\n\n    function clip(v0, v1, p, s) {\n      const d0 = v0.position.dot(p) - s\n      const d1 = v1.position.dot(p) - s\n\n      const s0 = d0 / (d0 - d1)\n\n      const v = new DecalVertex(\n        new Vector3(\n          v0.position.x + s0 * (v1.position.x - v0.position.x),\n          v0.position.y + s0 * (v1.position.y - v0.position.y),\n          v0.position.z + s0 * (v1.position.z - v0.position.z),\n        ),\n        new Vector3(\n          v0.normal.x + s0 * (v1.normal.x - v0.normal.x),\n          v0.normal.y + s0 * (v1.normal.y - v0.normal.y),\n          v0.normal.z + s0 * (v1.normal.z - v0.normal.z),\n        ),\n      )\n\n      // need to clip more values (texture coordinates)? do it this way:\n      // intersectpoint.value = a.value + s * ( b.value - a.value );\n\n      return v\n    }\n  }\n}\n\n// helper\n\nclass DecalVertex {\n  constructor(position, normal) {\n    this.position = position\n    this.normal = normal\n  }\n\n  clone() {\n    return new this.constructor(this.position.clone(), this.normal.clone())\n  }\n}\n\nexport { DecalGeometry, DecalVertex 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