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|  | With fix for a bug where alpha of 0.0 was mishandled applied. | 
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|  | it to work.
See changes in testdata/scad/convex_hull.scad The square(2) was never
rendered it was just there because the hull is calculated when it
itterates onto the second child. I also removed the unneeded parameter. | 
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|  | get an EOF, and so never pop the stack. | 
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