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get n-many vertices for a face

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Rachel Hwang 2017-06-13 20:38:38 -04:00
parent c82c3ec36e
commit 133e428cb4
1 changed files with 75 additions and 33 deletions
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108
lib/loadObj.js
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@ -44,11 +44,13 @@ function Primitive() {
var vertexPattern = /v( +[\d|\.|\+|\-|e|E]+)( +[\d|\.|\+|\-|e|E]+)( +[\d|\.|\+|\-|e|E]+)/; // v float float float var vertexPattern = /v( +[\d|\.|\+|\-|e|E]+)( +[\d|\.|\+|\-|e|E]+)( +[\d|\.|\+|\-|e|E]+)/; // v float float float
var normalPattern = /vn( +[\d|\.|\+|\-|e|E]+)( +[\d|\.|\+|\-|e|E]+)( +[\d|\.|\+|\-|e|E]+)/; // vn float float float var normalPattern = /vn( +[\d|\.|\+|\-|e|E]+)( +[\d|\.|\+|\-|e|E]+)( +[\d|\.|\+|\-|e|E]+)/; // vn float float float
var uvPattern = /vt( +[\d|\.|\+|\-|e|E]+)( +[\d|\.|\+|\-|e|E]+)/; // vt float float var uvPattern = /vt( +[\d|\.|\+|\-|e|E]+)( +[\d|\.|\+|\-|e|E]+)/; // vt float float
var facePattern1 = /f( +-?\d+)\/?( +-?\d+)\/?( +-?\d+)\/?( +-?\d+)?\/?/; // f vertex vertex vertex ... var facePattern1 = /f(\s+-?\d+\/?\/?){3,}/; // f vertex vertex vertex ...
var facePattern2 = /f( +(-?\d+)\/(-?\d+)\/?)( +(-?\d+)\/(-?\d+)\/?)( +(-?\d+)\/(-?\d+)\/?)( +(-?\d+)\/(-?\d+)\/?)?/; // f vertex/uv vertex/uv vertex/uv ... var facePattern2 = /f(\s+-?\d+\/-?\d+){3,}/; // f vertex/uv vertex/uv vertex/uv ...
var facePattern3 = /f( +(-?\d+)\/(-?\d+)\/(-?\d+))( +(-?\d+)\/(-?\d+)\/(-?\d+))( +(-?\d+)\/(-?\d+)\/(-?\d+))( +(-?\d+)\/(-?\d+)\/(-?\d+))?/; // f vertex/uv/normal vertex/uv/normal vertex/uv/normal ... var facePattern3 = /f(\s+-?\d+\/-?\d+\/-?\d+){3,}/; // f vertex/uv/normal vertex/uv/normal vertex/uv/normal ...
var facePattern4 = /f( +(-?\d+)\/\/(-?\d+))( +(-?\d+)\/\/(-?\d+))( +(-?\d+)\/\/(-?\d+))( +(-?\d+)\/\/(-?\d+))?/; // f vertex//normal vertex//normal vertex//normal ... var facePattern4 = /f(\s+-?\d+\/\/-?\d+){3,}/; // f vertex//normal vertex//normal vertex//normal ...
var faceSpacePattern = /f?\s+/;
var faceSpaceOrSlashPattern = /(f?\s+)|(\/+\s*)/g;
var scratchCartesian = new Cartesian3(); var scratchCartesian = new Cartesian3();
/** /**
@ -195,7 +197,33 @@ function loadObj(objPath, options) {
return index; return index;
} }
function addFace(v1, p1, u1, n1, v2, p2, u2, n2, v3, p3, u3, n3, v4, p4, u4, n4) { function addFace(vertices, positions, uvs, normals) {
var u1, u2, u3, u4, n1, n2, n3, n4;
var v1 = vertices[0];
var v2 = vertices[1];
var v3 = vertices[2];
var v4 = vertices[3];
var p1 = positions[0];
var p2 = positions[1];
var p3 = positions[2];
var p4 = positions[3];
if (uvs) {
u1 = uvs[0];
u2 = uvs[1];
u3 = uvs[2];
u4 = uvs[3];
}
if (normals) {
n1 = normals[0];
n2 = normals[1];
n3 = normals[2];
n4 = normals[3];
}
var index1 = addVertex(v1, p1, u1, n1); var index1 = addVertex(v1, p1, u1, n1);
var index2 = addVertex(v2, p2, u2, n2); var index2 = addVertex(v2, p2, u2, n2);
var index3 = addVertex(v3, p3, u3, n3); var index3 = addVertex(v3, p3, u3, n3);
@ -211,6 +239,7 @@ function loadObj(objPath, options) {
primitive.indices.push(index3); primitive.indices.push(index3);
primitive.indices.push(index4); primitive.indices.push(index4);
} }
} }
function parseLine(line) { function parseLine(line) {
@ -256,34 +285,47 @@ function loadObj(objPath, options) {
} else if ((result = uvPattern.exec(line)) !== null) { } else if ((result = uvPattern.exec(line)) !== null) {
uvs.push(parseFloat(result[1])); uvs.push(parseFloat(result[1]));
uvs.push(1.0 - parseFloat(result[2])); // Flip y so 0.0 is the bottom of the image uvs.push(1.0 - parseFloat(result[2])); // Flip y so 0.0 is the bottom of the image
} else if ((result = facePattern1.exec(line)) !== null) { } else if (facePattern1.test(line)) { // format "f v v v ..."
addFace( var faceVertices = line.replace(faceSpaceOrSlashPattern, ' ').substring(1).split(' '); // get vertices
result[1], result[1], undefined, undefined, addFace(faceVertices, faceVertices, undefined, undefined);
result[2], result[2], undefined, undefined, } else if (facePattern2.test(line)) { // format "f v/uv v/uv v/uv ..."
result[3], result[3], undefined, undefined, var faceVertices = line.replace(faceSpacePattern, ' ').substring(1).split(' '); // get vertex data (attributes '/' separated)
result[4], result[4], undefined, undefined var faceAttributes = line.replace(faceSpaceOrSlashPattern, ' ').substring(1).split(' '); // get vertex attributes
);
} else if ((result = facePattern2.exec(line)) !== null) { var facePositions = [];
addFace( var faceUvs = [];
result[1], result[2], result[3], undefined, for (var i=0; i <= faceAttributes.length - 2; i += 2)
result[4], result[5], result[6], undefined, {
result[7], result[8], result[9], undefined, facePositions.push(faceAttributes[i]);
result[10], result[11], result[12], undefined faceUvs.push(faceAttributes[i+1]);
); }
} else if ((result = facePattern3.exec(line)) !== null) { addFace(faceVertices, facePositions, faceUvs, undefined);
addFace( } else if (facePattern3.test(line)) { // format "v/uv/n v/uv/n v/uv/n ..."
result[1], result[2], result[3], result[4], var faceVertices = line.replace(faceSpacePattern, ' ').substring(1).split(' '); // get vertex data (attributes '/' separated)
result[5], result[6], result[7], result[8], var faceAttributes = line.replace(faceSpaceOrSlashPattern, ' ').substring(1).split(' '); // get vertex attributes
result[9], result[10], result[11], result[12],
result[13], result[14], result[15], result[16] var facePositions = [];
); var faceUvs = [];
} else if ((result = facePattern4.exec(line)) !== null) { var faceNormals = [];
addFace( for (var i=0; i <= faceAttributes.length - 3; i += 3)
result[1], result[2], undefined, result[3], {
result[4], result[5], undefined, result[6], facePositions.push(faceAttributes[i]);
result[7], result[8], undefined, result[9], faceUvs.push(faceAttributes[i+1]);
result[10], result[11], undefined, result[12] faceNormals.push(faceAttributes[i+2]);
); }
addFace(faceVertices, facePositions, faceUvs, faceNormals);
} else if (facePattern4.test(line)) { // format "v//n v//n v//n ..."
var faceVertices = line.replace(faceSpacePattern, ' ').substring(1).split(' '); // get vertex data (attributes '/' separated)
var faceAttributes = line.replace(faceSpaceOrSlashPattern, ' ').substring(1).split(' '); // get vertex attributes
var facePositions = [];
var faceNormals = [];
for (var i=0; i <= faceAttributes.length - 2; i += 2)
{
facePositions.push(faceAttributes[i]);
faceNormals.push(faceAttributes[i+1]);
}
addFace(faceVertices, facePositions, undefined, faceNormals);
} }
} }