add points option to test performance of particle systems

notes.md

@@ -4,6 +4,7 @@
 
 * `F` experiment with structuredClone(), SharedArrayBuffer, createImageBitmap()
 * `F` test #private fields, array.at() for negative indices
+* `F` option to hide platform when viewing from below
 
 # Kiri:Moto
 
@@ -107,6 +108,8 @@
 * `F` gcode output option as zip for multiple or flip ops or tool change
 * `F` maintain several part orientations + op chains in a single profile
 
+* `P` use SharedArrayBuffer for position array in animation
+* `P` routing should start with the smallest poly by area
 * `P` refactor slicing engine to use common core in geo
 * `P` port slicing to common core & refactor accordingly
 * `P` decrease cutting speed when entire tool is engaged (start of roughing)

release.md

@@ -12,6 +12,7 @@ Full docs @ https://docs.grid.space/projects/kiri-moto
 * fix CAM invalidation of tabs on scale and traces on scale or rotate
 * fix belt fan override for base extrusions touching belt
 
+
 # Release 3.5 (2022-10-07)
 
 ## Kiri:moto

src/kiri-mode/cam/animate.js

@@ -9,6 +9,7 @@ const { kiri } = root;
 const { driver } = kiri;
 const { CAM } = driver;
 const asLines = false;
+const asPoints = false;
 
 let meshes = {},
     unitScale = 1,
@@ -100,9 +101,19 @@ kiri.load(() => {
     function meshAdd(id, ind, pos) {
         const geo = new THREE.BufferGeometry();
         geo.setAttribute('position', new THREE.BufferAttribute(pos, 3));
-        geo.setIndex(new THREE.BufferAttribute(new Uint32Array(ind), 1));
+        if (ind.length) {
+            geo.setIndex(new THREE.BufferAttribute(new Uint32Array(ind), 1));
+        }
         let mesh;
-        if (asLines) {
+        if (asPoints) {
+            const mat = new THREE.PointsMaterial({
+                transparent: true,
+                opacity: 0.75,
+                color: 0x888888,
+                size: 0.3
+            });
+            mesh = new THREE.Points(geo, mat);
+        } else if (asLines) {
             const mat = new THREE.LineBasicMaterial({
                 transparent: true,
                 opacity: 0.75,
@@ -338,6 +349,9 @@ kiri.load(() => {
                 let px = pos[ai++] = x * step - ox + step / 2;
                 let py = pos[ai++] = y * step - oy + step / 2;
                 pos[ai++] = size.z;
+                if (asPoints) {
+                    continue;
+                }
                 if (asLines) {
                     if (y > 0) ind.appendAll([
                         (stepsY * x) + (y - 1),