65 lines
1.8 KiB
JavaScript
65 lines
1.8 KiB
JavaScript
import { Coord3D, CrossVector3D, SubCoord3D } from '../geometry/coord3d.js';
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import { Matrix } from '../geometry/matrix.js';
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import { Transformation } from '../geometry/transformation.js';
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export const MeshType =
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{
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Empty : 0,
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TriangleMesh : 1
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};
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export function GetMeshType (mesh)
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{
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if (mesh.TriangleCount () > 0) {
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return MeshType.TriangleMesh;
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}
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return MeshType.Empty;
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}
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export function CalculateTriangleNormal (v0, v1, v2)
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{
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let v = SubCoord3D (v1, v0);
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let w = SubCoord3D (v2, v0);
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let normal = CrossVector3D (v, w);
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normal.Normalize ();
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return normal;
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}
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export function TransformMesh (mesh, transformation)
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{
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if (transformation.IsIdentity ()) {
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return;
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}
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for (let i = 0; i < mesh.VertexCount (); i++) {
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let vertex = mesh.GetVertex (i);
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let transformed = transformation.TransformCoord3D (vertex);
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vertex.x = transformed.x;
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vertex.y = transformed.y;
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vertex.z = transformed.z;
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}
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if (mesh.NormalCount () > 0) {
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let trs = transformation.GetMatrix ().DecomposeTRS ();
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let normalMatrix = new Matrix ().ComposeTRS (new Coord3D (0.0, 0.0, 0.0), trs.rotation, new Coord3D (1.0, 1.0, 1.0));
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let normalTransformation = new Transformation (normalMatrix);
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for (let i = 0; i < mesh.NormalCount (); i++) {
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let normal = mesh.GetNormal (i);
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let transformed = normalTransformation.TransformCoord3D (normal);
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normal.x = transformed.x;
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normal.y = transformed.y;
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normal.z = transformed.z;
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}
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}
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}
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export function FlipMeshTrianglesOrientation (mesh)
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{
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for (let i = 0; i < mesh.TriangleCount (); i++) {
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let triangle = mesh.GetTriangle (i);
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let tmp = triangle.v1;
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triangle.v1 = triangle.v2;
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triangle.v2 = tmp;
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}
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}
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