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feature: Add the early support for 3d-tiles Pnts format
Issue iTowns#185 tracks the progress Position and RGB information are supported
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| import * as THREE from 'three'; | ||
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| const textDecoder = new TextDecoder('utf-8'); | ||
| export default { | ||
| parse: function parse(buffer) { | ||
| if (!buffer) { | ||
| throw new Error('No array buffer provided.'); | ||
| } | ||
| const view = new DataView(buffer); | ||
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| let byteOffset = 0; | ||
| const pntsHeader = {}; | ||
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| // Magic type is unsigned char [4] | ||
| pntsHeader.magic = textDecoder.decode(new Uint8Array(buffer, byteOffset, 4)); | ||
| byteOffset += 4; | ||
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| if (pntsHeader.magic) { | ||
| // Version, byteLength, batchTableJSONByteLength, batchTableBinaryByteLength and batchTable types are uint32 | ||
| pntsHeader.version = view.getUint32(byteOffset, true); | ||
| byteOffset += Uint32Array.BYTES_PER_ELEMENT; | ||
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| pntsHeader.byteLength = view.getUint32(byteOffset, true); | ||
| byteOffset += Uint32Array.BYTES_PER_ELEMENT; | ||
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| pntsHeader.FTJSONLength = view.getUint32(byteOffset, true); | ||
| byteOffset += Uint32Array.BYTES_PER_ELEMENT; | ||
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| pntsHeader.FTBinaryLength = view.getUint32(byteOffset, true); | ||
| byteOffset += Uint32Array.BYTES_PER_ELEMENT; | ||
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| pntsHeader.BTJSONLength = view.getUint32(byteOffset, true); | ||
| byteOffset += Uint32Array.BYTES_PER_ELEMENT; | ||
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| pntsHeader.BTBinaryLength = view.getUint32(byteOffset, true); | ||
| byteOffset += Uint32Array.BYTES_PER_ELEMENT; | ||
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| // binary table | ||
| if (pntsHeader.FTBinaryLength > 0) { | ||
| return parseFeatureBinary(buffer, byteOffset, pntsHeader.FTJSONLength); | ||
| } | ||
|
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||
| // batch table | ||
| if (pntsHeader.BTBinaryLength > 0) { | ||
| throw new Error('For pnts loader, BTBinaryLength: not yet managed'); | ||
| } | ||
| } else { | ||
| throw new Error('Invalid pnts file.'); | ||
| } | ||
| }, | ||
| }; | ||
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| function parseFeatureBinary(array, byteOffset, FTJSONLength) { | ||
| // Init geometry | ||
| const geometry = new THREE.BufferGeometry(); | ||
| const material = new THREE.PointsMaterial({ size: 0.05, vertexColors: THREE.VertexColors, sizeAttenuation: true }); | ||
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| // init Array feature binary | ||
| const subArrayJson = textDecoder.decode(new Uint8Array(array, byteOffset, FTJSONLength)); | ||
| const parseJSON = JSON.parse(subArrayJson); | ||
| let lengthFeature; | ||
| if (parseJSON.POINTS_LENGTH) { | ||
| lengthFeature = parseJSON.POINTS_LENGTH; | ||
| } | ||
| if (parseJSON.POSITION) { | ||
| const byteOffsetPos = (parseJSON.POSITION.byteOffset + subArrayJson.length + byteOffset); | ||
| const positionArray = new Float32Array(array, byteOffsetPos, lengthFeature * 3); | ||
| geometry.addAttribute('position', new THREE.BufferAttribute(positionArray, 3)); | ||
| } | ||
| if (parseJSON.RGB) { | ||
| const byteOffsetCol = parseJSON.RGB.byteOffset + subArrayJson.length + byteOffset; | ||
| const colorArray = new Uint8Array(array, byteOffsetCol, lengthFeature * 3); | ||
| geometry.addAttribute('color', new THREE.BufferAttribute(colorArray, 3, true)); | ||
| } | ||
| if (parseJSON.POSITION_QUANTIZED) { | ||
| throw new Error('For pnts loader, POSITION_QUANTIZED: not yet managed'); | ||
| } | ||
| if (parseJSON.RGBA) { | ||
| throw new Error('For pnts loader, RGBA: not yet managed'); | ||
| } | ||
| if (parseJSON.RGB565) { | ||
| throw new Error('For pnts loader, RGB565: not yet managed'); | ||
| } | ||
| if (parseJSON.NORMAL) { | ||
| throw new Error('For pnts loader, NORMAL: not yet managed'); | ||
| } | ||
| if (parseJSON.NORMAL_OCT16P) { | ||
| throw new Error('For pnts loader, NORMAL_OCT16P: not yet managed'); | ||
| } | ||
| if (parseJSON.BATCH_ID) { | ||
| throw new Error('For pnts loader, BATCH_ID: not yet managed'); | ||
| } | ||
| // creation points with geometry and material | ||
| const points = new THREE.Points(geometry, material); | ||
| points.realPointCount = lengthFeature; | ||
| return points; | ||
| } |