add obj import grouping, naming, and auto-scaling for Onshape exports

src/kiri/main.js

@@ -2456,12 +2456,28 @@ console.log/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
                     }
                 } else if (isobj) {
                     let objs = MOTO.OBJ.parse(e.target.result);
-                    for (let obj of objs) {
-                        platform.add(
-                            newWidget(undefined,group)
-                            .loadVertices(obj.toFloat32(),unitScale())
-                            .saveToCatalog(e.target.file.name)
-                        );
+                    let odon = function() {
+                        for (let obj of objs) {
+                            let name = e.target.file.name;
+                            if (obj.name) {
+                                name = obj.name + ' - ' + name;
+                            }
+                            platform.add(
+                                newWidget(undefined,group)
+                                .loadVertices(obj.toFloat32(), true)
+                                .saveToCatalog(name)
+                            );
+                        }
+                    };
+                    if (objs.length > 1 && !group) {
+                        UC.confirm('group objects?').then(ok => {
+                            if (ok) {
+                                group = [];
+                            }
+                            odon();
+                        });
+                    } else {
+                        odon();
                     }
                 }
                 else if (isgcode) loadCode(e.target.result, 'gcode');

src/kiri/widget.js

@@ -275,7 +275,19 @@ console.log/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
      * @param {Float32Array} vertices
      * @returns {Widget}
      */
-    PRO.loadVertices = function(vertices) {
+    PRO.loadVertices = function(vertices, autoscale) {
+        if (autoscale === true) {
+            // onshape exports obj in meters by default :/
+            let maxv = 0;
+            for (let i=0; i<vertices.length; i++) {
+                maxv = Math.max(Math.abs(vertices[i]));
+            }
+            if (maxv < 1) {
+                for (let i=0; i<vertices.length; i++) {
+                    vertices[i] *= 1000;
+                }
+            }
+        }
         if (this.mesh) {
             this.mesh.geometry.setAttribute('position', new THREE.BufferAttribute(vertices, 3));
             this.mesh.geometry.computeFaceNormals();

src/moto/load-obj.js

@@ -18,6 +18,7 @@
         let lines = text.split('\n').map(l => l.trim());
         let verts = [];
         let faces = [];
+        let obj = [ faces ];
 
         for (let line of lines) {
             let toks = line.split(' ');
@@ -27,17 +28,23 @@
                     break;
                 case 'f':
                     let tok = toks.map(f => parseInt(f.split('/')[0]));
+                    // add support for negative indices (offset from last vertex array point)
                     faces.appendAll(verts[tok[0]-1]);
                     faces.appendAll(verts[tok[1]-1]);
                     faces.appendAll(verts[tok[2]-1]);
                     break;
                 case 'g':
-                case 'o':
+                    if (faces.length) {
+                        obj.push(faces = []);
+                    }
+                    if (toks[0]) {
+                        faces.name = toks[0];
+                    }
                     break;
             }
         }
 
-        return [ faces ];
+        return obj;
     }
 
 })();