[OpenSCAD] Functional OpenSCAD, working with vertex data

jon jon at jonbondy.com
Tue Jan 30 14:25:21 EST 2018


I would welcome a switch that turned off implicit union, if the result 
was better performance.  I understand that I would need to alter my 
source code, and that I might need to modify library source code.

Jon


On 1/30/2018 2:05 PM, Carsten Arnholm wrote:
> 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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>

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