Package: openscad Version: 2011.12-3 With the attached files, "openscad knifeblock.scad" does not show anything. But if you copy knifeblock-bar-2.dxf to knifeblock-bar-2a.dxf, and edit the file knifeblock.scad accordingly, it does.
Providing an explicit "convexity=3" parameter fixes the problem. I conjecture that when the convexity parameter is not specified, openscad uses a value from uninitialised memory. I have seen a similar bug with another openscad primitive. If I am right, it would be wise to audit the source code for more occurrences (or refactor the argument-fetching idiom to make this class of bug impossible). Ian.
// -*- C -*-
//import(file="t.dxf");
//translate([0,100,0]){
//translate([0,0,10])
//import(file="knifeblock-knives-l1.dxf");
//import(file="knifeblock-knives-l2.dxf");
//import(file="t.dxf");
//import(file="knifeblock-knives-l2.dxf");
//import(file="foo.dxf");
//import(file="knifeblock-bar-2.dxf", convexity=3);
//import(file="knifeblock-bar-2a.dxf");
import(file="knifeblock-bar-2.dxf");
//import(file="foo-bar-2.dxf");
//}
knifeblock-bar-2.dxf
Description: test case included file
