38 lines
979 B
JavaScript
38 lines
979 B
JavaScript
import { CoordDistance3D, CrossVector3D, DotVector3D } from '../geometry/coord3d.js';
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export function GetTriangleArea (v0, v1, v2)
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{
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const a = CoordDistance3D (v0, v1);
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const b = CoordDistance3D (v1, v2);
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const c = CoordDistance3D (v0, v2);
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const s = (a + b + c) / 2.0;
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const areaSquare = s * (s - a) * (s - b) * (s - c);
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if (areaSquare < 0.0) {
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return 0.0;
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}
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return Math.sqrt (areaSquare);
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}
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export function GetTetrahedronSignedVolume (v0, v1, v2)
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{
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return DotVector3D (v0, CrossVector3D (v1, v2)) / 6.0;
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}
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export function CalculateVolume (object3D)
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{
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let volume = 0.0;
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object3D.EnumerateTriangleVertices ((v0, v1, v2) => {
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volume += GetTetrahedronSignedVolume (v0, v1, v2);
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});
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return volume;
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}
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export function CalculateSurfaceArea (object3D)
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{
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let surface = 0.0;
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object3D.EnumerateTriangleVertices ((v0, v1, v2) => {
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surface += GetTriangleArea (v0, v1, v2);
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});
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return surface;
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}
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