Sha256: f4b37326bddcda99050b9f548d622cdc1c0c427523b61984094e42bd3254a364
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Size: 1.21 KB
Versions: 13
Compression:
Stored size: 1.21 KB
Contents
// (re)calculates vertex normals based on Jax.Mesh vertex data
Jax.Mesh.prototype.calculateNormals = function() {
var mesh = this;
var triangles = mesh.getTriangles();
var normals = {}, i;
// it's much slower to nest an iteration within an iteration; instead
// we'll create properties in +normals+ and then enumerate the properties
// later.
for (i = 0; i < triangles.length; i++) {
var tri = triangles[i];
normals[tri.a] = normals[tri.a] || [];
normals[tri.b] = normals[tri.b] || [];
normals[tri.c] = normals[tri.c] || [];
normals[tri.a].push(tri.getNormal());
normals[tri.b].push(tri.getNormal());
normals[tri.c].push(tri.getNormal());
}
var normal = vec3.create();
mesh.dataRegion.remap(mesh.normalData, triangles.length * 9);
for (i = 0; i < mesh.vertices.length; i++) {
var v = mesh.vertices[i].array;
if (normals[v]) {
normal[0] = normal[1] = normal[2] = 0;
for (var j = 0; j < normals[v].length; j++)
vec3.add(normal, normals[v][j], normal);
vec3.scale(normal, 1/normals[v].length);
vec3.set(normal, mesh.normals[i].array);
}
}
// finally, update or create the WebGL buffer
mesh.buffers.normal_buffer.refresh();
}
Version data entries
13 entries across 13 versions & 1 rubygems