Ignore dimension when evaluating control modules mixed with geometry children. Fixes #229

src/CGALEvaluator.cc

@@ -130,6 +130,7 @@ CGAL_Nef_polyhedron CGALEvaluator::applyHull(const CgaladvNode &node)
 		const CGAL_Nef_polyhedron &chN = item.second;
 		// FIXME: Don't use deep access to modinst members
 		if (chnode->modinst->isBackground()) continue;
+		if (chN.dim == 0) continue; // Ignore object with dimension 0 (e.g. echo)
 		if (dim == 0) {
 			dim = chN.dim;
 		}

testdata/scad/features/control-hull-dimension.scad

@@ -0,0 +1,4 @@
+hull() {
+  circle(1);
+  echo(1);
+}

tests/regression/dumptest/control-hull-dimension-expected.txt

@@ -0,0 +1,5 @@
+	hull() {
+		circle($fn = 0, $fa = 12, $fs = 2, r = 1);
+		group();
+	}
+