fix phantom support generation off part or under bed

notes.md

@@ -12,6 +12,7 @@
 * `P` move all persisted / workspace settings/data to IndexedDB (LS limitations)
 * `P` do not move (average) endpoints connected to long lines in decimate
 * `P` explore widget vertex reloading / replacing (Onshape) (issue #48)
+* `P` faster ray intersect https://github.com/gkjohnson/three-mesh-bvh/
 
 * `F` edit in Mesh:Tool
 * `F` custom device vars for profiles / ranges / gcode
@@ -30,6 +31,7 @@
 * `B` multi-extruder rendering of raft fails to offset the rest of the print
 * `B` multi-extruder purge blocks fail to generate properly for rafts
 
+* `F` add layer start position as a range option
 * `F` support pillar top/bottom should conform to part
 * `F` support pillar should have solid top/bottom
 * `F` more explicit line width control with ranges and min/max adaptive

release.md

@@ -26,6 +26,7 @@
 * `C` add parameterized control of bridge/flat and infill print speeds
 * `C` add api control over threading workloads and use of wasm
 * `C` updates to raft generation: add border, connect infill lines
+* `C` fix phantom support generation off part or under bed
 * `P` template vars: nozzles used and layers until next use (IDEX)
 * `-` improved vertex replacement and widget update matrix tracking
 

src/kiri-mode/fdm/client.js

@@ -386,7 +386,7 @@ FDM.init = function(kiri, api) {
             removeWidgetSupport(lastPillar.widget, lastPillar);
             return;
         }
-        if (!iw) return;
+        if (!(iw && lastBox)) return;
         let { point, dim } = lastBox;
         p1.y = Math.max(0, p1.y);
         p2.y = Math.max(0, p2.y);
@@ -504,6 +504,8 @@ FDM.init = function(kiri, api) {
             addbox({x:p1.x, y:hy, z:p1.z}, 0x0000dd, 'supp', {
                 x:dw, y:dw, z:dy, rz
             });
+        } else {
+            lastBox = null;
         }
         if (event && event.altKey) {
             return func.hoverup();