fix adaptive layering first layer

notes.md

@@ -33,7 +33,7 @@
 # FDM
 
 * `B` dwell / extrude engage reversed?
-* `B` fix adaptive slicing. also with multi-extruder
+* `B` fix adaptive slicing with multi-extruder
 * `B` fix supports with grouped parts
 * `B` sparse infill should follow polys it intersects
 * `B` multi-extruder rendering of raft fails to offset the rest of the print
@@ -63,9 +63,11 @@
 
 # CAM
 
+* `B` climb vs conventional not fully consistent after refactor
 * `B` outside cutting direction in roughing mode inverted
 * `B` clear voids has double interior pass because wrong offset shadow used
 * `B` top clearing operations should use linear, not offset, passes
+* `F` parameterize dropping close points in prep.js. ensure long segments remain straight
 * `F` flat and volumetric rendering of paths
 * `F` z bounded slices (extension of z bottom offset feature)
 * `F` z planar settings visualizations
@@ -77,7 +79,6 @@
 * `F` ease-in and ease-out especially on tab cut-out start/stop
 * `F` implement z line-only follows for ball/taper
 * `F` add option to spiral in vs out (optimal tool life) vs mixed (optimal path)
-* `F` add endmill spiral direction to fully respect climb vs conventional
 * `F` add support for tapered ball mills
 * `F` warn when part > stock or cuts go outside bed
 * `P` crossing open space check point is outside camshell before returning max z

src/kiri/slicer.js

@@ -286,7 +286,7 @@
         } else if (zIncMin) {
             // console.log('adaptive slicing', zIncMin, ':', zInc, 'from', zMin, 'to', zMax);
             // FDM adaptive slicing
-            let zPos = zMin + zIncFirst,
+            let zPos = zIncFirst,
                 zOI = 0,
                 zDelta,
                 zDivMin,
@@ -298,12 +298,18 @@
             // first slice is fixed
             zHeights.push(zIncFirst);
             zIndexes.push(zIncFirst / 2);
-
+            // console.log({zIncFirst, zOrdered})
             while (zPos < zMax && zOI < zOrdered.length) {
                 nextZ = zOrdered[zOI++];
-                if (zPos >= nextZ) continue;
+                if (zPos >= nextZ) {
+                    // console.log('skip',{zPos},'>=',{nextZ});
+                    continue;
+                }
                 zDelta = nextZ - zPos;
-                if (zDelta < zIncMin) continue;
+                if (zDelta < zIncMin) {
+                    // console.log('skip',{zDelta},'<',{zIncMin});
+                    continue;
+                }
 
                 zDivMin = Math.floor(zDelta / zIncMin);
                 zDivMax = Math.floor(zDelta / zInc);

src/mode/fdm/slice.js

@@ -106,10 +106,13 @@
             spro.firstSliceHeight = sliceHeight;
         }
 
+        const sliceMinHeight = spro.sliceAdaptive && spro.sliceMinHeight > 0 ?
+            Math.min(spro.sliceMinHeight, sliceHeight) : 0;
+
         if (spro.firstSliceHeight < sliceHeight) {
             DBUG.log("invalid first layer height < slice height");
-            DBUG.log("reverting to slice height");
-            spro.firstSliceHeight = sliceHeight;
+            DBUG.log("reverting to min valid slice height");
+            spro.firstSliceHeight = sliceMinHeight || sliceHeight;
         }
 
         // const slicer = new KIRI.slicer2(widget.getPoints(), { });
@@ -134,9 +137,6 @@
         // } });
         // onSliceDone(slices);
 
-        const sliceMinHeight = spro.sliceAdaptive && spro.sliceMinHeight > 0 ?
-            Math.min(spro.sliceMinHeight, sliceHeight) : 0;
-
         SLICER.sliceWidget(widget, {
             height: sliceHeight,
             minHeight: sliceMinHeight,