Merge branch 'master' of github.com:openscad/openscad

src/csgtermnormalizer.cc

@@ -20,7 +20,7 @@ shared_ptr<CSGTerm> CSGTermNormalizer::normalize(const shared_ptr<CSGTerm> &root
 			PRINTB("WARNING: Normalized tree is growing past %d elements. Aborting normalization.\n", this->limit);
       // Clean up any partially evaluated terms
 			shared_ptr<CSGTerm> newroot = root, tmproot;
-			while (newroot != tmproot) {
+			while (newroot && newroot != tmproot) {
 				tmproot = newroot;
 				newroot = collapse_null_terms(tmproot);
 			}

testdata/scad/bugs/issue267-normalization-crash.scad

@@ -0,0 +1,86 @@
+/*
+ *  Reported by Justin Charette
+ *  Causes a crash in CSGTermNormalizer::normalize() when CSG element count
+ *  exceeds limit setting in preferences (verified with default value of 2000).
+ */
+
+
+$fn=20;
+
+/* donut (r1, r2, t) {{{
+  r1 = radius of torus
+  r2 = radius of torus cross section (circle)
+  t  = thickness of shell (t == 0 is 
+*/
+module donut (r1, r2, t=0) {
+  difference() {
+    rotate_extrude( convexity=6 ) {
+      translate([r1, 0, 0]) {
+        circle( r = r2 );
+      }
+    }
+    // (t == 0 ? solid : hollow ) 
+    if (t > 0) {
+      rotate_extrude( convexity=6 ) {
+        translate([r1, 0, 0]) {
+          circle( r = r2-t );
+        }
+      }
+    }
+  }
+} //}}}
+
+/* half donut (r1, r2, t, round) {{{
+  r1     = radius of torus
+  r2     = radius of torus cross section (circle)
+  t      = thickness of shell
+  round  = trim ends of semi-torus so they are round
+*/
+module half_donut (r1, r2, t=1, round=false) {
+  difference() {
+    donut( r1, r2, t );
+    difference() {
+      translate( [0, -((r1+r2)/2+0.5), 0] )
+        scale( [2*(r1+r2)+1, r1+r2+1, 2*r2+1] )
+          square( 1, center=true );
+      if (round) {
+        rotate( 90, [0, 1, 0] )
+          cylinder( 2*(r1+r2)+2, r2, r2, center=true );
+      }
+    }
+  }
+} //}}}
+
+/* donut flange (r1, r2, a1, a2, a_step, t, round) {{{
+  r1      = radius of torus
+  r2      = radius of torus cross section (circle)
+  a1      = starting angle of flange rotation
+  a2      = stopping angle of flange rotation
+  a_step  = increment size of flange rotation
+  t       = thickness of shell (t == 0 is solid, t in (0, r2) is hollow)
+  round   = (true/false) to trim ends of semi-torus so they are round
+*/
+module donut_flange (r1, r2, a1, a2, a_step=1, t=0, round=false) {
+  difference() {
+    union() {
+      for (a = [a1:a_step:a2]) {
+        rotate( a, [1, 0, 0] )
+          half_donut( r1, r2, round );
+      }
+    }
+    // (t == 0 ? solid : hollow ) 
+    if (t > 0) {
+      union() {
+        for (a = [a1:a_step:a2]) {
+          rotate( a, [1, 0, 0] )
+            half_donut( r1, r2-t, round );
+        }
+      }
+    }
+  }
+} //}}}
+
+donut( 20, 5 );
+donut_flange( 20, 5, 0, 50, 10, t=1, round=false );
+
+// vim: set et sw=2 ts=2 sts=2 ai sta sr fdm=marker: