Testcase and fix for a problem transforming an empty bbox with very small numbers in a transformation matrix

1 files changed, 11 insertions, 0 deletions

diff --git a/testdata/scad/misc/rotate-empty-bbox.scad b/testdata/scad/misc/rotate-empty-bbox.scad
new file mode 100644
index 0000000..f39a923
--- /dev/null
+++ b/testdata/scad/misc/rotate-empty-bbox.scad
@@ -0,0 +1,11 @@
+// rotate([90,0,0]) results in a matrix with some close-to-zero values
+// Transforming an empty boundingbox by this matrix has caused a problem resulting
+// in the union being evaluated to nothing.
+rotate([90,0,0]) 
+difference() {
+  cube(60, center=true);
+  union() {
+    translate([0,0,40]) cube(50, center=true);
+    cube(0);
+  }
+}