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@@ -3,69 +3,71 @@ import { VertexBuffer } from "babylonjs/Meshes/buffer";
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import { Vector3 } from "babylonjs/Maths/math";
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/**
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- * Class for generating STL data from a Babylon scene.
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- */
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+* Class for generating STL data from a Babylon scene.
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+*/
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export class STLExport {
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- /**
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- * Exports the geometry of a Mesh array in .STL file format (ASCII)
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- * @param meshes list defines the mesh to serialize
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- * @param download triggers the automatic download of the file.
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- * @param fileName changes the downloads fileName.
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- * @param binary changes the STL to a binary type.
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- * @returns the STL as UTF8 string
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- */
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- public static CreateSTL(meshes: Mesh[], download:boolean=true, fileName:string='STL_Mesh', binary:boolean=false): any {
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-
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+ /**
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+ * Exports the geometry of a Mesh array in .STL file format (ASCII)
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+ * @param meshes list defines the mesh to serialize
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+ * @param download triggers the automatic download of the file.
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+ * @param fileName changes the downloads fileName.
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+ * @param binary changes the STL to a binary type.
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+ * @returns the STL as UTF8 string
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+ */
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+ public static CreateSTL(meshes: Mesh[], download:boolean=true, fileName:string='STL_Mesh', binary:boolean=false): any {
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+
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let data;
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let multiMesh = false;
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- if(meshes.length>1){multiMesh=true;}
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+ if(meshes.length>1){
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+ multiMesh=true;
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+ }
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if(!binary){
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- data = 'solid exportedMesh\r\n';
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- for(let i=0; i<meshes.length; i++){
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- let mesh = meshes[i];
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- mesh.bakeCurrentTransformIntoVertices();
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- let vertices = mesh.getVerticesData(VertexBuffer.PositionKind) || [];
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- let indices = mesh.getIndices() || [];
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-
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- for (let i = 0; i < indices.length; i += 3) {
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- let id = [indices[i] * 3, indices[i + 1] * 3, indices[i + 2] * 3];
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- let v = [
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- new Vector3(vertices[id[0]], vertices[id[0] + 1], vertices[id[0] + 2]),
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- new Vector3(vertices[id[1]], vertices[id[1] + 1], vertices[id[1] + 2]),
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- new Vector3(vertices[id[2]], vertices[id[2] + 1], vertices[id[2] + 2])
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- ];
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- let p1p2 = v[0].subtract(v[1]);
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- let p3p2 = v[2].subtract(v[1]);
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- let n = (Vector3.Cross(p1p2, p3p2)).normalize();
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-
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- data += 'facet normal ' + n.x + ' ' + n.y + ' ' + n.z + '\r\n';
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- data += '\touter loop\r\n';
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- data += '\t\tvertex ' + v[0].x + ' ' + v[0].y + ' ' + v[0].z + '\r\n';
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- data += '\t\tvertex ' + v[1].x + ' ' + v[1].y + ' ' + v[1].z + '\r\n';
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- data += '\t\tvertex ' + v[2].x + ' ' + v[2].y + ' ' + v[2].z + '\r\n';
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- data += '\tendloop\r\n';
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- data += 'endfacet\r\n';
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- }
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- }
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-
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- data += 'endsolid exportedMesh';
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-
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+ data = 'solid exportedMesh\r\n';
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+ for(let i=0; i<meshes.length; i++){
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+ let mesh = meshes[i];
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+ mesh.bakeCurrentTransformIntoVertices();
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+ let vertices = mesh.getVerticesData(VertexBuffer.PositionKind) || [];
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+ let indices = mesh.getIndices() || [];
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+
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+ for (let i = 0; i < indices.length; i += 3) {
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+ let id = [indices[i] * 3, indices[i + 1] * 3, indices[i + 2] * 3];
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+ let v = [
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+ new Vector3(vertices[id[0]], vertices[id[0] + 1], vertices[id[0] + 2]),
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+ new Vector3(vertices[id[1]], vertices[id[1] + 1], vertices[id[1] + 2]),
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+ new Vector3(vertices[id[2]], vertices[id[2] + 1], vertices[id[2] + 2])
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+ ];
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+ let p1p2 = v[0].subtract(v[1]);
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+ let p3p2 = v[2].subtract(v[1]);
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+ let n = (Vector3.Cross(p1p2, p3p2)).normalize();
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+
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+ data += 'facet normal ' + n.x + ' ' + n.y + ' ' + n.z + '\r\n';
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+ data += '\touter loop\r\n';
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+ data += '\t\tvertex ' + v[0].x + ' ' + v[0].y + ' ' + v[0].z + '\r\n';
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+ data += '\t\tvertex ' + v[1].x + ' ' + v[1].y + ' ' + v[1].z + '\r\n';
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+ data += '\t\tvertex ' + v[2].x + ' ' + v[2].y + ' ' + v[2].z + '\r\n';
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+ data += '\tendloop\r\n';
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+ data += 'endfacet\r\n';
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+ }
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+ }
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+
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+ data += 'endsolid exportedMesh';
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+
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}else{
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-
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+
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//Adapted from https://gist.github.com/paulkaplan/6d5f0ab2c7e8fdc68a61
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let faceCount = 0;
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for(let i=0; i<meshes.length; i++){
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let mesh = meshes[i];
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faceCount += mesh.getIndices().length;
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}
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-
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+
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let isLittleEndian = true;
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-
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+
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let bufferSize = 84 + (50 * faceCount);
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let buffer = new ArrayBuffer(bufferSize);
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data = new DataView(buffer);
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let offset = 0;
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-
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+
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let writeVector = function(dataview:any, offset:number, vector:Vector3, isLittleEndian:boolean){
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offset = writeFloat(dataview, offset, vector.x, isLittleEndian);
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offset = writeFloat(dataview, offset, vector.y, isLittleEndian);
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@@ -76,7 +78,7 @@ export class STLExport {
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dataview.setFloat32(offset, value, isLittleEndian);
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return offset + 4;
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};
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-
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+
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//Allow later for binary Messages to be passed in the header for now offset by 80.
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offset += 80;
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data.setUint32(offset, faceCount, isLittleEndian);
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@@ -87,13 +89,13 @@ export class STLExport {
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mesh.bakeCurrentTransformIntoVertices();
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let vertices = mesh.getVerticesData(VertexBuffer.PositionKind) || [];
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let indices = mesh.getIndices() || [];
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-
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+
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for (let i = 0; i < indices.length; i += 3) {
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let id = [indices[i] * 3, indices[i + 1] * 3, indices[i + 2] * 3];
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let v = [
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- new Vector3(vertices[id[0]], vertices[id[0] + 1], vertices[id[0] + 2]),
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- new Vector3(vertices[id[1]], vertices[id[1] + 1], vertices[id[1] + 2]),
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- new Vector3(vertices[id[2]], vertices[id[2] + 1], vertices[id[2] + 2])
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+ new Vector3(vertices[id[0]], vertices[id[0] + 1], vertices[id[0] + 2]),
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+ new Vector3(vertices[id[1]], vertices[id[1] + 1], vertices[id[1] + 2]),
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+ new Vector3(vertices[id[2]], vertices[id[2] + 1], vertices[id[2] + 2])
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];
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let p1p2 = v[0].subtract(v[1]);
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let p3p2 = v[2].subtract(v[1]);
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@@ -108,7 +110,7 @@ export class STLExport {
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}
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}
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- if (download) {
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+ if (download) {
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let a = document.createElement('a');
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let blob = new Blob([data], {'type': 'application/octet-stream'});
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a.href = window.URL.createObjectURL(blob);
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@@ -120,10 +122,6 @@ export class STLExport {
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a.click();
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}
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- /*if(binary){
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- return String.fromCharCode.apply(null, new Uint16Array(data));
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- }*/
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-
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- return data;
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- }
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+ return data;
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+ }
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}
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