diff --git a/testdata/scad/features/linear_extrude-scale-tests.scad b/testdata/scad/features/linear_extrude-scale-tests.scad
deleted file mode 100644
index 9a82c9d7..00000000
--- a/testdata/scad/features/linear_extrude-scale-tests.scad
+++ /dev/null
@@ -1,17 +0,0 @@
-difference() {
-    linear_extrude(height=40, scale=[0, 0]) {
-        square(10, center=true);
-        translate([10,0]) circle(10);
-    }
- translate([0,0,35])   sphere(10);
-}
-
-/*
-Test case ideas:
-o off-center starting point
-o Concave polygon
-o Disjoint polygons
-o multi-rotation twist
-o zero scales, zero scales in only one axis (for the above cases)
-o boolean operations on scaled extrusion (including zero scale)
-*/
diff --git a/testdata/scad/features/linear_extrude-scale-zero-tests.scad b/testdata/scad/features/linear_extrude-scale-zero-tests.scad
new file mode 100644
index 00000000..8a85203b
--- /dev/null
+++ b/testdata/scad/features/linear_extrude-scale-zero-tests.scad
@@ -0,0 +1,56 @@
+// test cases for linear extrude with scale
+// by TakeItAndRun 2013
+
+// syntax: linear_extrude(height=a, slices=b, twist=c, scale=[x,y])
+
+a=3;
+b=20;
+c=0;
+x=1;
+y=1;
+
+module linear_extrudes_of_different_shapes(a=a,b=b,c=c,x=x,y=y) {
+  translate(00*[4,0,0])
+  // linear_extrude of shape with hole
+  linear_extrude(height=a, slices=b, twist=c, scale=[x,y])
+    difference() {
+      square(2,true); square(1,true);
+    }
+  
+  translate(01*[4,0,0])
+  // linear_extrude of disjoint polygons shapes
+  linear_extrude(height=a, slices=b, twist=c, scale=[x,y]) {
+    translate([1,0,0]) square(1,true);
+    translate([-1,0,0]) square(1,true);
+  }
+  
+  translate(02*[4,0,0])
+  // linear_extrude with a coplanar face
+  linear_extrude(height=a, slices=b, twist=c, scale=[x,y]) {
+    translate([.5,0,0])square();
+    translate([-.5,0,0])square();
+  }
+  
+  translate(03*[4,0,0])
+  // linear_extrude with internal hole and one coplanar edge
+  linear_extrude(height=a, slices=b, twist=c, scale=[x,y])
+  difference() {
+    square(2,true);
+    translate([-0.5,0,0]) square(1,true);
+  }
+}
+
+
+// Test varying parameters
+translate(00*[0,3,0])
+linear_extrudes_of_different_shapes(c=0,x=0,y=y);
+translate(01*[0,3,0])
+linear_extrudes_of_different_shapes(c=0,x=x,y=0);
+translate(02*[0,3,0])
+linear_extrudes_of_different_shapes(c=0,x=0,y=0);
+translate(03*[0,3,0])
+linear_extrudes_of_different_shapes(c=180,x=0,y=y);
+translate(04*[0,3,0])
+linear_extrudes_of_different_shapes(c=180,x=x,y=0);
+translate(05*[0,3,0])
+linear_extrudes_of_different_shapes(c=180,x=0,y=0);
diff --git a/testdata/scad/features/linear_extrude-tests.scad b/testdata/scad/features/linear_extrude-tests.scad
index 67d892f2..528eea25 100644
--- a/testdata/scad/features/linear_extrude-tests.scad
+++ b/testdata/scad/features/linear_extrude-tests.scad
@@ -12,4 +12,13 @@ translate([31.5,2.5,0]) linear_extrude(height=10, twist=-45) polygon(points = [[
 translate([0,20,0]) linear_extrude(height=20, twist=45, slices=2) square([10,10]);
 translate([19,20,0]) linear_extrude(height=20, twist=45, slices=10) square([10,10]);
 
-translate([-15,0,0]) linear_extrude(5) square([10,10]);
+translate([0,-15,0]) linear_extrude(5) square([10,10]);
+
+// scale given as a scalar
+translate([-25,-10,0]) linear_extrude(height=10, scale=2) square(5, center=true);
+// scale given as a 3-dim vector
+translate([-15,20,0]) linear_extrude(height=20, scale=[4,5,6]) square(10);
+// scale is negative
+translate([-10,5,0]) linear_extrude(height=15, scale=-2) square(10, center=true);
+// scale given as undefined
+translate([-15,-15,0]) linear_extrude(height=10, scale=var_undef) square(10);
diff --git a/tests/regression/cgalpngtest/linear_extrude-scale-zero-tests-expected.png b/tests/regression/cgalpngtest/linear_extrude-scale-zero-tests-expected.png
new file mode 100644
index 00000000..3b1c9345
Binary files /dev/null and b/tests/regression/cgalpngtest/linear_extrude-scale-zero-tests-expected.png differ
diff --git a/tests/regression/cgalpngtest/linear_extrude-tests-expected.png b/tests/regression/cgalpngtest/linear_extrude-tests-expected.png
index 7d3ea2c7..c85142e0 100644
Binary files a/tests/regression/cgalpngtest/linear_extrude-tests-expected.png and b/tests/regression/cgalpngtest/linear_extrude-tests-expected.png differ
diff --git a/tests/regression/dumptest/linear_extrude-scale-zero-tests-expected.txt b/tests/regression/dumptest/linear_extrude-scale-zero-tests-expected.txt
new file mode 100644
index 00000000..950c7248
--- /dev/null
+++ b/tests/regression/dumptest/linear_extrude-scale-zero-tests-expected.txt
@@ -0,0 +1,253 @@
+	multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+		group() {
+			multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 0, slices = 20, scale = [0, 1], $fn = 0, $fa = 12, $fs = 2) {
+					difference() {
+						square(size = [2, 2], center = true);
+						square(size = [1, 1], center = true);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 4], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 0, slices = 20, scale = [0, 1], $fn = 0, $fa = 12, $fs = 2) {
+					multmatrix([[1, 0, 0, 1], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = true);
+					}
+					multmatrix([[1, 0, 0, -1], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = true);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 8], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 0, slices = 20, scale = [0, 1], $fn = 0, $fa = 12, $fs = 2) {
+					multmatrix([[1, 0, 0, 0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = false);
+					}
+					multmatrix([[1, 0, 0, -0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = false);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 12], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 0, slices = 20, scale = [0, 1], $fn = 0, $fa = 12, $fs = 2) {
+					difference() {
+						square(size = [2, 2], center = true);
+						multmatrix([[1, 0, 0, -0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+							square(size = [1, 1], center = true);
+						}
+					}
+				}
+			}
+		}
+	}
+	multmatrix([[1, 0, 0, 0], [0, 1, 0, 3], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+		group() {
+			multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 0, slices = 20, scale = [1, 0], $fn = 0, $fa = 12, $fs = 2) {
+					difference() {
+						square(size = [2, 2], center = true);
+						square(size = [1, 1], center = true);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 4], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 0, slices = 20, scale = [1, 0], $fn = 0, $fa = 12, $fs = 2) {
+					multmatrix([[1, 0, 0, 1], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = true);
+					}
+					multmatrix([[1, 0, 0, -1], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = true);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 8], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 0, slices = 20, scale = [1, 0], $fn = 0, $fa = 12, $fs = 2) {
+					multmatrix([[1, 0, 0, 0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = false);
+					}
+					multmatrix([[1, 0, 0, -0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = false);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 12], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 0, slices = 20, scale = [1, 0], $fn = 0, $fa = 12, $fs = 2) {
+					difference() {
+						square(size = [2, 2], center = true);
+						multmatrix([[1, 0, 0, -0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+							square(size = [1, 1], center = true);
+						}
+					}
+				}
+			}
+		}
+	}
+	multmatrix([[1, 0, 0, 0], [0, 1, 0, 6], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+		group() {
+			multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 0, slices = 20, scale = [0, 0], $fn = 0, $fa = 12, $fs = 2) {
+					difference() {
+						square(size = [2, 2], center = true);
+						square(size = [1, 1], center = true);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 4], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 0, slices = 20, scale = [0, 0], $fn = 0, $fa = 12, $fs = 2) {
+					multmatrix([[1, 0, 0, 1], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = true);
+					}
+					multmatrix([[1, 0, 0, -1], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = true);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 8], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 0, slices = 20, scale = [0, 0], $fn = 0, $fa = 12, $fs = 2) {
+					multmatrix([[1, 0, 0, 0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = false);
+					}
+					multmatrix([[1, 0, 0, -0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = false);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 12], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 0, slices = 20, scale = [0, 0], $fn = 0, $fa = 12, $fs = 2) {
+					difference() {
+						square(size = [2, 2], center = true);
+						multmatrix([[1, 0, 0, -0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+							square(size = [1, 1], center = true);
+						}
+					}
+				}
+			}
+		}
+	}
+	multmatrix([[1, 0, 0, 0], [0, 1, 0, 9], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+		group() {
+			multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 180, slices = 20, scale = [0, 1], $fn = 0, $fa = 12, $fs = 2) {
+					difference() {
+						square(size = [2, 2], center = true);
+						square(size = [1, 1], center = true);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 4], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 180, slices = 20, scale = [0, 1], $fn = 0, $fa = 12, $fs = 2) {
+					multmatrix([[1, 0, 0, 1], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = true);
+					}
+					multmatrix([[1, 0, 0, -1], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = true);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 8], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 180, slices = 20, scale = [0, 1], $fn = 0, $fa = 12, $fs = 2) {
+					multmatrix([[1, 0, 0, 0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = false);
+					}
+					multmatrix([[1, 0, 0, -0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = false);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 12], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 180, slices = 20, scale = [0, 1], $fn = 0, $fa = 12, $fs = 2) {
+					difference() {
+						square(size = [2, 2], center = true);
+						multmatrix([[1, 0, 0, -0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+							square(size = [1, 1], center = true);
+						}
+					}
+				}
+			}
+		}
+	}
+	multmatrix([[1, 0, 0, 0], [0, 1, 0, 12], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+		group() {
+			multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 180, slices = 20, scale = [1, 0], $fn = 0, $fa = 12, $fs = 2) {
+					difference() {
+						square(size = [2, 2], center = true);
+						square(size = [1, 1], center = true);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 4], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 180, slices = 20, scale = [1, 0], $fn = 0, $fa = 12, $fs = 2) {
+					multmatrix([[1, 0, 0, 1], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = true);
+					}
+					multmatrix([[1, 0, 0, -1], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = true);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 8], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 180, slices = 20, scale = [1, 0], $fn = 0, $fa = 12, $fs = 2) {
+					multmatrix([[1, 0, 0, 0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = false);
+					}
+					multmatrix([[1, 0, 0, -0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = false);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 12], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 180, slices = 20, scale = [1, 0], $fn = 0, $fa = 12, $fs = 2) {
+					difference() {
+						square(size = [2, 2], center = true);
+						multmatrix([[1, 0, 0, -0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+							square(size = [1, 1], center = true);
+						}
+					}
+				}
+			}
+		}
+	}
+	multmatrix([[1, 0, 0, 0], [0, 1, 0, 15], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+		group() {
+			multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 180, slices = 20, scale = [0, 0], $fn = 0, $fa = 12, $fs = 2) {
+					difference() {
+						square(size = [2, 2], center = true);
+						square(size = [1, 1], center = true);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 4], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 180, slices = 20, scale = [0, 0], $fn = 0, $fa = 12, $fs = 2) {
+					multmatrix([[1, 0, 0, 1], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = true);
+					}
+					multmatrix([[1, 0, 0, -1], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = true);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 8], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 180, slices = 20, scale = [0, 0], $fn = 0, $fa = 12, $fs = 2) {
+					multmatrix([[1, 0, 0, 0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = false);
+					}
+					multmatrix([[1, 0, 0, -0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+						square(size = [1, 1], center = false);
+					}
+				}
+			}
+			multmatrix([[1, 0, 0, 12], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				linear_extrude(height = 3, center = false, convexity = 1, twist = 180, slices = 20, scale = [0, 0], $fn = 0, $fa = 12, $fs = 2) {
+					difference() {
+						square(size = [2, 2], center = true);
+						multmatrix([[1, 0, 0, -0.5], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+							square(size = [1, 1], center = true);
+						}
+					}
+				}
+			}
+		}
+	}
+
diff --git a/tests/regression/dumptest/linear_extrude-tests-expected.txt b/tests/regression/dumptest/linear_extrude-tests-expected.txt
index c031ed81..c8673881 100644
--- a/tests/regression/dumptest/linear_extrude-tests-expected.txt
+++ b/tests/regression/dumptest/linear_extrude-tests-expected.txt
@@ -29,9 +29,29 @@
 			square(size = [10, 10], center = false);
 		}
 	}
-	multmatrix([[1, 0, 0, -15], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+	multmatrix([[1, 0, 0, 0], [0, 1, 0, -15], [0, 0, 1, 0], [0, 0, 0, 1]]) {
 		linear_extrude(height = 5, center = false, convexity = 1, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
 			square(size = [10, 10], center = false);
 		}
 	}
+	multmatrix([[1, 0, 0, -25], [0, 1, 0, -10], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+		linear_extrude(height = 10, center = false, convexity = 1, scale = [2, 2], $fn = 0, $fa = 12, $fs = 2) {
+			square(size = [5, 5], center = true);
+		}
+	}
+	multmatrix([[1, 0, 0, -15], [0, 1, 0, 20], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+		linear_extrude(height = 20, center = false, convexity = 1, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
+			square(size = [10, 10], center = false);
+		}
+	}
+	multmatrix([[1, 0, 0, -10], [0, 1, 0, 5], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+		linear_extrude(height = 15, center = false, convexity = 1, scale = [0, 0], $fn = 0, $fa = 12, $fs = 2) {
+			square(size = [10, 10], center = true);
+		}
+	}
+	multmatrix([[1, 0, 0, -15], [0, 1, 0, -15], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+		linear_extrude(height = 10, center = false, convexity = 1, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
+			square(size = [10, 10], center = false);
+		}
+	}
 
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