[OpenSCAD] Functional OpenSCAD, working with vertex data

Carsten Arnholm arnholm at arnholm.org
Tue Jan 30 14:05:06 EST 2018

On 30. jan. 2018 17:49, Jordan Brown wrote:
> Not knowing how hull( ) works, I wouldn't have expected there to be a 
> difference.
> Good information, thanks.

The problem is not hull(), but implicit union. Hull only needs the 
points in the input mesh(es). Applying [implicit] union() before 
applying hull() to the result is like unknowingly driving with the hand 
brake engaged. You perform a potentially costly computation (union()) 
only to immediately throw away the result.

One idea would be to provide an option to switch off implicit union, and 
such issues will go away.

Carsten Arnholm

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