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The Trouble with Namespaces

Fri Feb 22, 2013

Today, I’m going to talk about the way my attitude towards using namespaces has pretty much done a complete reversal over the last couple of years.  I started off thinking that they looked great, progressed to mild concern that they seemed to be causing unexpected difficulties, and eventually realized that they can become unmanageable if allowed to grow out of control.  Just like a bunch of tribbles. (Yes, the title is a Star Trek reference :).

Tags: 3D Modeling

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3D Modeling in Popular Culture

Mon Jan 14, 2013

Did anyone else notice in Prometheus (recent movie), that when they landed on the planet of the crazy space men, the ship's captain used something suspiciously like a laser scanner to get a 3D point cloud which mapped the tunnels in the alien city?

Tags: 3D Modeling

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It’s Easier Using 3D Solids

Tue Nov 27, 2012

In my last post I constructed a thin walled 3D body of a teapot from surface data using surfacing operations.  Whilst the code I used worked it was more complicated than I expected when I started, so I took a second look at the workflow.  Once again here is the description of the input data:

Tags: 3D Modeling

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Making 3D Solids from Surface Data

Mon Nov 19, 2012

Recently I was looking at some surfacing operations and I thought it would make an interesting case study to complete the entire workflow of building a 3D solid model from a set of surfaces.  My idea was simply to join the surfaces together and then thicken the resulting sheet body to make a thin walled solid.

Tags: 3D Modeling

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Scripting: It’s Not Just for Browser Apps

Mon Aug 20, 2012

In my last post I mentioned C3D Toolkit, our JavaScript-based demo application, and said I’d discuss it more in another post.  Well, here it is :)

Tags: 3D Modeling

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Double, Double, Trouble

Tue Jun 19, 2012
While procrastinating (avoiding writing this blog entry for as long as possible), I debugged an interesting problem.  This gives me something to talk about here.  What follows might be simple or obvious, but I find that considering tiny details very carefully is a good way to improve the quality of the code I write.  Consider the following code snippets

Tags: 3D Modeling

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Application-Driven Development in Action

Tue Jun 5, 2012

Today, I’m going to discuss how we’ve been using Application Driven Development (AppDD) principles in our work on CGM.

Tags: 3D Modeling

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What's Up With the GPU?

Thu May 17, 2012

In my previous post I discussed the various multiprocessing technologies at my disposal. These are: OpenMP, MPI, PPL (Microsoft Concurrency Runtime), the ACIS thread manager, and the CGM multiprocessing infrastructure. As it turns out, I overlooked a completely relevant technology, the GPU. I would like to correct this oversight and pass along my experiences in adapting the primality algorithm used in the previous discussion to run on a GPU.  (Look here for a brief introduction to GPU computing)

Tags: 3D Modeling

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Subtleties of B-rep Translation (Part 2); Why Form Matters

Fri May 4, 2012

'Form' in mathematics manifests itself in all manners of perspective and discussion. From your earliest mathematics courses, professors drilled home the discipline; “return all answers in simplest form”. My youthful efforts to dismiss the need yielded discussions as such; “OK, please graph this 

Tags: 3D Modeling

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Subtleties of B-rep Translation (Part 1); Why Sharing Matters

Thu Apr 5, 2012

In my last post, I introduced our idea of B-rep Health and the notion of "legal" but bad B-rep modeling data. Literally, the day after publishing that post, a beautiful, classic case came into development where a "remove face" operation failed due to unhealthy B-rep data. And again, as we see so many times, the culprit was bad translation (unknown third party translator). It’s a nice example. But it’s not that the pathology can be described so conceptually (it can - you will see), more, it shows the subtle, implicit information that is maintained inside a B-rep data structure; information you might not know is used. And lastly, it shows why the fundamentals of B-rep data translation are so important.  

Tags: 3D Modeling

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