eBook: 5 Essential Functions of 3D ACIS Modeler

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A Guilty Secret

Ok.  I admit it.  I sometimes use text based debugging.  It’s ugly and when there is a better way, I jump to the alternative, but sometimes "printf"s hidden behind a preprocessor define are the fast tool to figuring out what is going on. 

How Healthy is Your B-rep?

We’ve known for a long time that the integrity of B-rep data plays a major role in the success of downstream modeling operations; but it has always been a difficult task communicating this back to our users in a meaningful manner. For ACIS we have had an external geometry and topology checker since the beginning of the product; it serves the function of defining illegal state(s) of the model.  It has, and still does, serve its purpose.

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Managing the 16,777,217th Color

Here’s a quick poll:  How many of you have figured out by now that 16,777,217 = 2^24+1, and that the "24" refers to the 3 RGB bytes in RGBA32?

An alternate title I considered for this post was "NoColor is a color", which would have been an inside joke for people who go to science fiction conventions.  Considering the audience, I decided to stick with the computer science reference :)

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