George Boole=Άγγλος μαθηματικός (1815-1864)

Boolean Union
A boolean union of two primitives is analogous to 'merging' them together, and treating them as a single object. This graphic depicts a boolean union:


The red cube and the blue sphere are combined using the CSG union operator to create a single object, with the appearance of both primitives merged together.

Some software distinguishes the Union from a different operator, Merge, which does the union in such a way that the surfaces inside the merged region are not rendered. This would be desirable in cases where the objects are transparent, and the union should be treated as a single solid object. In particular, the POV-Ray graphics package implements this concept.

http://www.wikipedia.org/wiki/Constructive_Solid_Geometry

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Note added at 2003-07-26 15:03:31 (GMT) Post-grading
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