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639 lines
14 KiB
639 lines
14 KiB
/**
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* Octahedron and Quantization encodings based on work by:
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*
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* @link https://github.com/tsherif/mesh-quantization-example
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*
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*/
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import {
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BufferAttribute,
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Matrix3,
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Matrix4,
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Vector3
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} from 'three';
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import { PackedPhongMaterial } from './PackedPhongMaterial.js';
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/**
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* Make the input mesh.geometry's normal attribute encoded and compressed by 3 different methods.
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* Also will change the mesh.material to `PackedPhongMaterial` which let the vertex shader program decode the normal data.
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*
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* @param {THREE.Mesh} mesh
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* @param {String} encodeMethod "DEFAULT" || "OCT1Byte" || "OCT2Byte" || "ANGLES"
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*
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*/
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function compressNormals( mesh, encodeMethod ) {
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if ( ! mesh.geometry ) {
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console.error( 'Mesh must contain geometry. ' );
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}
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const normal = mesh.geometry.attributes.normal;
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if ( ! normal ) {
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console.error( 'Geometry must contain normal attribute. ' );
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}
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if ( normal.isPacked ) return;
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if ( normal.itemSize != 3 ) {
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console.error( 'normal.itemSize is not 3, which cannot be encoded. ' );
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}
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const array = normal.array;
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const count = normal.count;
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let result;
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if ( encodeMethod == 'DEFAULT' ) {
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// TODO: Add 1 byte to the result, making the encoded length to be 4 bytes.
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result = new Uint8Array( count * 3 );
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for ( let idx = 0; idx < array.length; idx += 3 ) {
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const encoded = defaultEncode( array[ idx ], array[ idx + 1 ], array[ idx + 2 ], 1 );
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result[ idx + 0 ] = encoded[ 0 ];
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result[ idx + 1 ] = encoded[ 1 ];
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result[ idx + 2 ] = encoded[ 2 ];
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}
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mesh.geometry.setAttribute( 'normal', new BufferAttribute( result, 3, true ) );
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mesh.geometry.attributes.normal.bytes = result.length * 1;
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} else if ( encodeMethod == 'OCT1Byte' ) {
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/**
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* It is not recommended to use 1-byte octahedron normals encoding unless you want to extremely reduce the memory usage
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* As it makes vertex data not aligned to a 4 byte boundary which may harm some WebGL implementations and sometimes the normal distortion is visible
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* Please refer to @zeux 's comments in https://github.com/mrdoob/three.js/pull/18208
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*/
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result = new Int8Array( count * 2 );
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for ( let idx = 0; idx < array.length; idx += 3 ) {
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const encoded = octEncodeBest( array[ idx ], array[ idx + 1 ], array[ idx + 2 ], 1 );
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result[ idx / 3 * 2 + 0 ] = encoded[ 0 ];
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result[ idx / 3 * 2 + 1 ] = encoded[ 1 ];
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}
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mesh.geometry.setAttribute( 'normal', new BufferAttribute( result, 2, true ) );
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mesh.geometry.attributes.normal.bytes = result.length * 1;
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} else if ( encodeMethod == 'OCT2Byte' ) {
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result = new Int16Array( count * 2 );
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for ( let idx = 0; idx < array.length; idx += 3 ) {
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const encoded = octEncodeBest( array[ idx ], array[ idx + 1 ], array[ idx + 2 ], 2 );
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result[ idx / 3 * 2 + 0 ] = encoded[ 0 ];
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result[ idx / 3 * 2 + 1 ] = encoded[ 1 ];
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}
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mesh.geometry.setAttribute( 'normal', new BufferAttribute( result, 2, true ) );
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mesh.geometry.attributes.normal.bytes = result.length * 2;
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} else if ( encodeMethod == 'ANGLES' ) {
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result = new Uint16Array( count * 2 );
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for ( let idx = 0; idx < array.length; idx += 3 ) {
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const encoded = anglesEncode( array[ idx ], array[ idx + 1 ], array[ idx + 2 ] );
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result[ idx / 3 * 2 + 0 ] = encoded[ 0 ];
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result[ idx / 3 * 2 + 1 ] = encoded[ 1 ];
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}
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mesh.geometry.setAttribute( 'normal', new BufferAttribute( result, 2, true ) );
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mesh.geometry.attributes.normal.bytes = result.length * 2;
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} else {
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console.error( 'Unrecognized encoding method, should be `DEFAULT` or `ANGLES` or `OCT`. ' );
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}
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mesh.geometry.attributes.normal.needsUpdate = true;
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mesh.geometry.attributes.normal.isPacked = true;
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mesh.geometry.attributes.normal.packingMethod = encodeMethod;
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// modify material
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if ( ! ( mesh.material instanceof PackedPhongMaterial ) ) {
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mesh.material = new PackedPhongMaterial().copy( mesh.material );
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}
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if ( encodeMethod == 'ANGLES' ) {
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mesh.material.defines.USE_PACKED_NORMAL = 0;
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}
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if ( encodeMethod == 'OCT1Byte' ) {
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mesh.material.defines.USE_PACKED_NORMAL = 1;
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}
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if ( encodeMethod == 'OCT2Byte' ) {
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mesh.material.defines.USE_PACKED_NORMAL = 1;
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}
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if ( encodeMethod == 'DEFAULT' ) {
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mesh.material.defines.USE_PACKED_NORMAL = 2;
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}
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}
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/**
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* Make the input mesh.geometry's position attribute encoded and compressed.
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* Also will change the mesh.material to `PackedPhongMaterial` which let the vertex shader program decode the position data.
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*
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* @param {THREE.Mesh} mesh
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*
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*/
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function compressPositions( mesh ) {
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if ( ! mesh.geometry ) {
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console.error( 'Mesh must contain geometry. ' );
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}
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const position = mesh.geometry.attributes.position;
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if ( ! position ) {
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console.error( 'Geometry must contain position attribute. ' );
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}
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if ( position.isPacked ) return;
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if ( position.itemSize != 3 ) {
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console.error( 'position.itemSize is not 3, which cannot be packed. ' );
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}
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const array = position.array;
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const encodingBytes = 2;
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const result = quantizedEncode( array, encodingBytes );
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const quantized = result.quantized;
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const decodeMat = result.decodeMat;
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// IMPORTANT: calculate original geometry bounding info first, before updating packed positions
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if ( mesh.geometry.boundingBox == null ) mesh.geometry.computeBoundingBox();
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if ( mesh.geometry.boundingSphere == null ) mesh.geometry.computeBoundingSphere();
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mesh.geometry.setAttribute( 'position', new BufferAttribute( quantized, 3 ) );
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mesh.geometry.attributes.position.isPacked = true;
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mesh.geometry.attributes.position.needsUpdate = true;
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mesh.geometry.attributes.position.bytes = quantized.length * encodingBytes;
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// modify material
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if ( ! ( mesh.material instanceof PackedPhongMaterial ) ) {
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mesh.material = new PackedPhongMaterial().copy( mesh.material );
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}
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mesh.material.defines.USE_PACKED_POSITION = 0;
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mesh.material.uniforms.quantizeMatPos.value = decodeMat;
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mesh.material.uniforms.quantizeMatPos.needsUpdate = true;
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}
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/**
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* Make the input mesh.geometry's uv attribute encoded and compressed.
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* Also will change the mesh.material to `PackedPhongMaterial` which let the vertex shader program decode the uv data.
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*
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* @param {THREE.Mesh} mesh
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*
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*/
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function compressUvs( mesh ) {
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if ( ! mesh.geometry ) {
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console.error( 'Mesh must contain geometry property. ' );
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}
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const uvs = mesh.geometry.attributes.uv;
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if ( ! uvs ) {
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console.error( 'Geometry must contain uv attribute. ' );
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}
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if ( uvs.isPacked ) return;
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const range = { min: Infinity, max: - Infinity };
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const array = uvs.array;
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for ( let i = 0; i < array.length; i ++ ) {
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range.min = Math.min( range.min, array[ i ] );
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range.max = Math.max( range.max, array[ i ] );
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}
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let result;
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if ( range.min >= - 1.0 && range.max <= 1.0 ) {
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// use default encoding method
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result = new Uint16Array( array.length );
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for ( let i = 0; i < array.length; i += 2 ) {
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const encoded = defaultEncode( array[ i ], array[ i + 1 ], 0, 2 );
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result[ i ] = encoded[ 0 ];
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result[ i + 1 ] = encoded[ 1 ];
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}
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mesh.geometry.setAttribute( 'uv', new BufferAttribute( result, 2, true ) );
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mesh.geometry.attributes.uv.isPacked = true;
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mesh.geometry.attributes.uv.needsUpdate = true;
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mesh.geometry.attributes.uv.bytes = result.length * 2;
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if ( ! ( mesh.material instanceof PackedPhongMaterial ) ) {
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mesh.material = new PackedPhongMaterial().copy( mesh.material );
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}
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mesh.material.defines.USE_PACKED_UV = 0;
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} else {
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// use quantized encoding method
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result = quantizedEncodeUV( array, 2 );
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mesh.geometry.setAttribute( 'uv', new BufferAttribute( result.quantized, 2 ) );
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mesh.geometry.attributes.uv.isPacked = true;
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mesh.geometry.attributes.uv.needsUpdate = true;
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mesh.geometry.attributes.uv.bytes = result.quantized.length * 2;
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if ( ! ( mesh.material instanceof PackedPhongMaterial ) ) {
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mesh.material = new PackedPhongMaterial().copy( mesh.material );
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}
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mesh.material.defines.USE_PACKED_UV = 1;
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mesh.material.uniforms.quantizeMatUV.value = result.decodeMat;
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mesh.material.uniforms.quantizeMatUV.needsUpdate = true;
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}
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}
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// Encoding functions
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function defaultEncode( x, y, z, bytes ) {
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if ( bytes == 1 ) {
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const tmpx = Math.round( ( x + 1 ) * 0.5 * 255 );
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const tmpy = Math.round( ( y + 1 ) * 0.5 * 255 );
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const tmpz = Math.round( ( z + 1 ) * 0.5 * 255 );
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return new Uint8Array( [ tmpx, tmpy, tmpz ] );
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} else if ( bytes == 2 ) {
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const tmpx = Math.round( ( x + 1 ) * 0.5 * 65535 );
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const tmpy = Math.round( ( y + 1 ) * 0.5 * 65535 );
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const tmpz = Math.round( ( z + 1 ) * 0.5 * 65535 );
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return new Uint16Array( [ tmpx, tmpy, tmpz ] );
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} else {
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console.error( 'number of bytes must be 1 or 2' );
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}
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}
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// for `Angles` encoding
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function anglesEncode( x, y, z ) {
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const normal0 = parseInt( 0.5 * ( 1.0 + Math.atan2( y, x ) / Math.PI ) * 65535 );
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const normal1 = parseInt( 0.5 * ( 1.0 + z ) * 65535 );
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return new Uint16Array( [ normal0, normal1 ] );
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}
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// for `Octahedron` encoding
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function octEncodeBest( x, y, z, bytes ) {
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let oct, dec, best, currentCos, bestCos;
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// Test various combinations of ceil and floor
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// to minimize rounding errors
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best = oct = octEncodeVec3( x, y, z, 'floor', 'floor' );
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dec = octDecodeVec2( oct );
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bestCos = dot( x, y, z, dec );
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oct = octEncodeVec3( x, y, z, 'ceil', 'floor' );
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dec = octDecodeVec2( oct );
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currentCos = dot( x, y, z, dec );
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if ( currentCos > bestCos ) {
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best = oct;
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bestCos = currentCos;
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}
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oct = octEncodeVec3( x, y, z, 'floor', 'ceil' );
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dec = octDecodeVec2( oct );
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currentCos = dot( x, y, z, dec );
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if ( currentCos > bestCos ) {
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best = oct;
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bestCos = currentCos;
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}
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oct = octEncodeVec3( x, y, z, 'ceil', 'ceil' );
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dec = octDecodeVec2( oct );
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currentCos = dot( x, y, z, dec );
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if ( currentCos > bestCos ) {
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best = oct;
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}
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return best;
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function octEncodeVec3( x0, y0, z0, xfunc, yfunc ) {
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let x = x0 / ( Math.abs( x0 ) + Math.abs( y0 ) + Math.abs( z0 ) );
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let y = y0 / ( Math.abs( x0 ) + Math.abs( y0 ) + Math.abs( z0 ) );
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if ( z < 0 ) {
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const tempx = ( 1 - Math.abs( y ) ) * ( x >= 0 ? 1 : - 1 );
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const tempy = ( 1 - Math.abs( x ) ) * ( y >= 0 ? 1 : - 1 );
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x = tempx;
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y = tempy;
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let diff = 1 - Math.abs( x ) - Math.abs( y );
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if ( diff > 0 ) {
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diff += 0.001;
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x += x > 0 ? diff / 2 : - diff / 2;
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y += y > 0 ? diff / 2 : - diff / 2;
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}
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}
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if ( bytes == 1 ) {
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return new Int8Array( [
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Math[ xfunc ]( x * 127.5 + ( x < 0 ? 1 : 0 ) ),
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Math[ yfunc ]( y * 127.5 + ( y < 0 ? 1 : 0 ) )
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] );
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}
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if ( bytes == 2 ) {
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return new Int16Array( [
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Math[ xfunc ]( x * 32767.5 + ( x < 0 ? 1 : 0 ) ),
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Math[ yfunc ]( y * 32767.5 + ( y < 0 ? 1 : 0 ) )
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] );
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}
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}
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function octDecodeVec2( oct ) {
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let x = oct[ 0 ];
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let y = oct[ 1 ];
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if ( bytes == 1 ) {
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x /= x < 0 ? 127 : 128;
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y /= y < 0 ? 127 : 128;
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} else if ( bytes == 2 ) {
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x /= x < 0 ? 32767 : 32768;
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y /= y < 0 ? 32767 : 32768;
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}
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const z = 1 - Math.abs( x ) - Math.abs( y );
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if ( z < 0 ) {
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const tmpx = x;
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x = ( 1 - Math.abs( y ) ) * ( x >= 0 ? 1 : - 1 );
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y = ( 1 - Math.abs( tmpx ) ) * ( y >= 0 ? 1 : - 1 );
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}
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const length = Math.sqrt( x * x + y * y + z * z );
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return [
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x / length,
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y / length,
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z / length
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];
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}
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function dot( x, y, z, vec3 ) {
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return x * vec3[ 0 ] + y * vec3[ 1 ] + z * vec3[ 2 ];
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}
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}
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function quantizedEncode( array, bytes ) {
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let quantized, segments;
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if ( bytes == 1 ) {
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quantized = new Uint8Array( array.length );
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segments = 255;
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} else if ( bytes == 2 ) {
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quantized = new Uint16Array( array.length );
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segments = 65535;
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} else {
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console.error( 'number of bytes error! ' );
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}
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const decodeMat = new Matrix4();
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const min = new Float32Array( 3 );
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const max = new Float32Array( 3 );
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min[ 0 ] = min[ 1 ] = min[ 2 ] = Number.MAX_VALUE;
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max[ 0 ] = max[ 1 ] = max[ 2 ] = - Number.MAX_VALUE;
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for ( let i = 0; i < array.length; i += 3 ) {
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min[ 0 ] = Math.min( min[ 0 ], array[ i + 0 ] );
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min[ 1 ] = Math.min( min[ 1 ], array[ i + 1 ] );
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min[ 2 ] = Math.min( min[ 2 ], array[ i + 2 ] );
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max[ 0 ] = Math.max( max[ 0 ], array[ i + 0 ] );
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max[ 1 ] = Math.max( max[ 1 ], array[ i + 1 ] );
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max[ 2 ] = Math.max( max[ 2 ], array[ i + 2 ] );
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}
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decodeMat.scale( new Vector3(
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( max[ 0 ] - min[ 0 ] ) / segments,
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( max[ 1 ] - min[ 1 ] ) / segments,
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( max[ 2 ] - min[ 2 ] ) / segments
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) );
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decodeMat.elements[ 12 ] = min[ 0 ];
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decodeMat.elements[ 13 ] = min[ 1 ];
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decodeMat.elements[ 14 ] = min[ 2 ];
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decodeMat.transpose();
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const multiplier = new Float32Array( [
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max[ 0 ] !== min[ 0 ] ? segments / ( max[ 0 ] - min[ 0 ] ) : 0,
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max[ 1 ] !== min[ 1 ] ? segments / ( max[ 1 ] - min[ 1 ] ) : 0,
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max[ 2 ] !== min[ 2 ] ? segments / ( max[ 2 ] - min[ 2 ] ) : 0
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] );
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for ( let i = 0; i < array.length; i += 3 ) {
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quantized[ i + 0 ] = Math.floor( ( array[ i + 0 ] - min[ 0 ] ) * multiplier[ 0 ] );
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quantized[ i + 1 ] = Math.floor( ( array[ i + 1 ] - min[ 1 ] ) * multiplier[ 1 ] );
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quantized[ i + 2 ] = Math.floor( ( array[ i + 2 ] - min[ 2 ] ) * multiplier[ 2 ] );
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}
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return {
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quantized: quantized,
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decodeMat: decodeMat
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};
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}
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function quantizedEncodeUV( array, bytes ) {
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let quantized, segments;
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if ( bytes == 1 ) {
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quantized = new Uint8Array( array.length );
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segments = 255;
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} else if ( bytes == 2 ) {
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|
|
|
quantized = new Uint16Array( array.length );
|
|
segments = 65535;
|
|
|
|
} else {
|
|
|
|
console.error( 'number of bytes error! ' );
|
|
|
|
}
|
|
|
|
const decodeMat = new Matrix3();
|
|
|
|
const min = new Float32Array( 2 );
|
|
const max = new Float32Array( 2 );
|
|
|
|
min[ 0 ] = min[ 1 ] = Number.MAX_VALUE;
|
|
max[ 0 ] = max[ 1 ] = - Number.MAX_VALUE;
|
|
|
|
for ( let i = 0; i < array.length; i += 2 ) {
|
|
|
|
min[ 0 ] = Math.min( min[ 0 ], array[ i + 0 ] );
|
|
min[ 1 ] = Math.min( min[ 1 ], array[ i + 1 ] );
|
|
max[ 0 ] = Math.max( max[ 0 ], array[ i + 0 ] );
|
|
max[ 1 ] = Math.max( max[ 1 ], array[ i + 1 ] );
|
|
|
|
}
|
|
|
|
decodeMat.scale(
|
|
( max[ 0 ] - min[ 0 ] ) / segments,
|
|
( max[ 1 ] - min[ 1 ] ) / segments
|
|
);
|
|
|
|
decodeMat.elements[ 6 ] = min[ 0 ];
|
|
decodeMat.elements[ 7 ] = min[ 1 ];
|
|
|
|
decodeMat.transpose();
|
|
|
|
const multiplier = new Float32Array( [
|
|
max[ 0 ] !== min[ 0 ] ? segments / ( max[ 0 ] - min[ 0 ] ) : 0,
|
|
max[ 1 ] !== min[ 1 ] ? segments / ( max[ 1 ] - min[ 1 ] ) : 0
|
|
] );
|
|
|
|
for ( let i = 0; i < array.length; i += 2 ) {
|
|
|
|
quantized[ i + 0 ] = Math.floor( ( array[ i + 0 ] - min[ 0 ] ) * multiplier[ 0 ] );
|
|
quantized[ i + 1 ] = Math.floor( ( array[ i + 1 ] - min[ 1 ] ) * multiplier[ 1 ] );
|
|
|
|
}
|
|
|
|
return {
|
|
quantized: quantized,
|
|
decodeMat: decodeMat
|
|
};
|
|
|
|
}
|
|
|
|
|
|
|
|
export {
|
|
compressNormals,
|
|
compressPositions,
|
|
compressUvs,
|
|
};
|
|
|