File size: 4,770 Bytes
71174bc | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 | // parseVRML.js
// Function to parse VRML file and extract vertices, face indices, colors, and normals
function parseVRML(fileContent) {
// Split the file content into separate sections (Shape { ... } blocks)
let shapeChunkContents = fileContent.split('Shape {')
const firstChunkContent = shapeChunkContents.shift();
const chunkDatas = []
for (let chunkIdx in shapeChunkContents) {
const shapeChunkContent = shapeChunkContents[chunkIdx];
const vertexRegex = /point \[([\s\S]*?)\]/;
const indexRegex = /coordIndex \[([\s\S]*?)\]/;
const colorRegex = /color \[([\s\S]*?)\]/;
const normalRegex = /vector \[([\s\S]*?)\]/; // For normals (vector field)
const vertexBlock = shapeChunkContent.match(vertexRegex);
const indexBlock = shapeChunkContent.match(indexRegex);
const colorBlock = shapeChunkContent.match(colorRegex);
const normalBlock = shapeChunkContent.match(normalRegex);
if (!vertexBlock || !indexBlock) {
console.error("No vertices or indices found in chunk " + chunkIdx.toString() + " VRML file.");
continue
}
console.log(`Processing chunk ${chunkIdx}`);
// Parse vertices
const vertexString = vertexBlock[1];
const vertexNumbers = vertexString.match(/-?\d+(\.\d+)?([eE][+-]?\d+)?/g).map(Number);
if (vertexNumbers.length % 3 !== 0) {
console.error("Vertex data is not a multiple of 3.");
process.exit(1);
}
let vertices = [];
for (let i = 0; i < vertexNumbers.length; i += 3) {
vertices.push([vertexNumbers[i], vertexNumbers[i + 1], vertexNumbers[i + 2]]);
}
// Parse indices
const indexString = indexBlock[1];
const indexNumbers = indexString.match(/-?\d+/g).map(Number);
let indices = indexNumbers;
// Parse colors
let colors = [];
if (colorBlock) {
const colorString = colorBlock[1];
const colorNumbers = colorString.match(/-?\d+(\.\d+)?([eE][+-]?\d+)?/g).map(Number);
if (colorNumbers.length % 3 !== 0) {
console.error("Color data is not a multiple of 3.");
process.exit(1);
}
for (let i = 0; i < colorNumbers.length; i += 3) {
colors.push([colorNumbers[i], colorNumbers[i + 1], colorNumbers[i + 2]]);
}
} else {
// Assign default colors if none are found
colors = Array(vertices.length).fill([1.0, 1.0, 1.0]);
}
// Parse normals
let normals = [];
if (normalBlock) {
const normalString = normalBlock[1];
const normalNumbers = normalString.match(/-?\d+(\.\d+)?([eE][+-]?\d+)?/g).map(Number);
if (normalNumbers.length % 3 !== 0) {
console.error("Normal data is not a multiple of 3.");
process.exit(1);
}
for (let i = 0; i < normalNumbers.length; i += 3) {
normals.push([normalNumbers[i], normalNumbers[i + 1], normalNumbers[i + 2]]);
}
}
// console.log(vertices.length, indices.length, colors.length, normals.length);
chunkDatas.push({ vertices, indices, colors, normals, shapeChunkContent });
}
return {chunkDatas, firstChunkContent};
}
// Function to replace the vertices, colors, normals, and indices in VRML file with merged ones
function replaceVerticesAndIndicesInVRML(
fileContent,
mergedVertices,
mergedColors,
mergedNormals,
updatedIndices
) {
const vertexString = mergedVertices.map(v => v.join(' ')).join(',\n');
const indexString = updatedIndices.join(',\n');
const colorString = mergedColors.map(c => c.join(' ')).join(',\n');
const normalString = mergedNormals.length > 0 ? mergedNormals.map(n => n.join(' ')).join(',\n') : '';
let updatedContent = fileContent.replace(/point \[([\s\S]*?)\]/, `point [\n${vertexString}\n]`);
updatedContent = updatedContent.replace(/coordIndex \[([\s\S]*?)\]/, `coordIndex [\n${indexString}\n]`);
if (fileContent.match(/color \[([\s\S]*?)\]/)) {
updatedContent = updatedContent.replace(/color \[([\s\S]*?)\]/, `color [\n${colorString}\n]`);
} else {
// Insert color block after coordIndex if it doesn't exist
updatedContent = updatedContent.replace(/(coordIndex \[[\s\S]*?\])/, `$1\ncolor [\n${colorString}\n]`);
}
if (fileContent.match(/vector \[([\s\S]*?)\]/)) {
updatedContent = updatedContent.replace(/vector \[([\s\S]*?)\]/, `vector [\n${normalString}\n]`);
}
return updatedContent;
}
module.exports = {
parseVRML,
replaceVerticesAndIndicesInVRML
};
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