[OpenSCAD] Surface() from PNG and difference()

MLewis revmikelewis at gmail.com
Wed Apr 29 13:01:24 EDT 2015

Hoping someone can give me a hand here:

I've got a PNG that I want to "stamp" into the side of an object. To test
this, I created the following code:

*** BEGIN CODE ***

logox = 587;
logoy = 623;


*** END CODE ***

As shown below, it previews (F5) correctly. However, the GUI is very
sluggish with this render.
When I attempt to render (F6), however, I get nothing:

The original PNG:

The Preview:

The Attempt to Render:

One other data point: I've increased my caches in the GUI, but when I run
"OpenSCAD -o foo.stl LogoTest.scad" from the command line, I get "WARNING:
GeometryEvaluator: Node didn't fit into cache" errors (three of them), the
process runs forever (as far as I can tell) and uses 99ish% of the CPU.

Any help that anyone can provide would be greatly appreciated. Thanks a lot!

Mike Lewis

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