3D for the Rest of Us, Part 1: 3D Coordinate System

re: 3D for the Rest of Us, Part 1: 3D Coordinate System

Kieran Benton — Tue, 20 Jul 2004 12:58:00 GMT

Great blog! I look forward to reading the rest of your articles. Incidentally, the camera is of particular interest to myself...

re: 3D for the Rest of Us, Part 1: 3D Coordinate System

Joel Martinez — Tue, 20 Jul 2004 13:34:00 GMT

Excellent post ... I wonder what kind of support there will be for loading geometry authored in other environments. Is there at least .X loading functionality?

re: 3D for the Rest of Us, Part 1: 3D Coordinate System

sk — Tue, 20 Jul 2004 14:05:00 GMT

What was the reason right handed system was chosen? Rendering performance?!

re: 3D for the Rest of Us, Part 1: 3D Coordinate System

danlehen — Tue, 20 Jul 2004 16:20:00 GMT

Kieran - Thx for the feedback. I was planning to show how you can use transforms to move geometry in front of a stationary camera in my next post, then talk about setting up cameras in part 3.

Joel - We are still working on our story for importing content from 3D tools into Avalon. We know we need to make this easy, we just do not know if the best approach is building support for specific 3D file formats into Avalon or relying on converts/exporters like this one (http://blogs.msdn.com/danlehen/archive/2004/06/11/154028.aspx). We would love to hear your thoughts.

SK - I am glad you asked. There is no technical advantage. The decision came about by first deciding that while there have been many religious debates on LH vs. RH, the decision really is arbitrary. Most recent 3D platforms have been RH to be consistent with the majority of math and physics texts and we chose to follow the trend.

A similar decision was made regarding row vs. column vectors where we chose not to follow the trend. Even though most recent graphics platforms choose column vectors we chose to stick with row vectors because we thought it was the right decision for our years of GDI+/DX customers who want to migrate their row vector based code to Avalon. It's not my personal preference, but the motivation makes sense and so far all of the code I have written for samples, etc. uses our Transform classes so I haven't had to think about it.

RH vs. LH and row vs. column vectors are clearly religious arguments. However if you have an opinion I encourage you to express it. Finding out that 98% of our customers always use a LH camera when working in D3D would be very useful information to have. :)

re: 3D for the Rest of Us, Part 1: 3D Coordinate System

Joel Martinez — Tue, 20 Jul 2004 16:48:00 GMT

Well, the converters/exporters concept is great for when you want to hardcode a model into your application. But I am sure there will be situations where that would like to be dynamic.

If I had my say, I would like to have at least .x loading functionality ... and of course that could be exposed as a xaml tag in addition to an api call. But do it such that it is extensible (using the provider model for example) so people can author their own loaders and plug it right into the system.

On the issue of lh vs rh ... I say that as long as that is easily changed, it doesn't matter. That being said, I've always used lh :-)

re: 3D for the Rest of Us, Part 1: 3D Coordinate System

Joel Martinez — Tue, 20 Jul 2004 16:58:00 GMT

You know what ... I just came across your other post about using xaml as a persistence format. If there is already an existing way to load a model from a .xaml file, then that fulfills my requirement. Any model that I may have can simply be converted into a .xaml file for deployment.

Thanks for all the updates ... it's great to get a behind the scenes peek at what's coming up.

3D for the Rest of Us, Part 1: 3D Coordinate System

iain.weblog( — Thu, 22 Jul 2004 16:48:00 GMT

re: 3D for the Rest of Us, Part 1: 3D Coordinate System

Joel Martinez — Thu, 22 Jul 2004 14:41:00 GMT

Out of curiosity ... Does avalon 3D transparently take care of optimizations such as culling unseen geometry?

re: 3D for the Rest of Us, Part 1: 3D Coordinate System

danlehen — Thu, 22 Jul 2004 14:51:00 GMT

Joel - Being a retained scene graph oriented platform we have created the opportunity for us to do a lot of optimizations behind the scenes. However, our 3D support in build 4074 is still very immature in this regard. 2D is already culling geometry known to be off screen before it is even marshalled to the render thread.

PS - Thanks for the feedback on file content importion / LH camera.

3D for the Rest of Us

flex-mx — Fri, 23 Jul 2004 01:17:00 GMT

3D for the Rest of Us...

re: Overwhelming Response

IEBlog — Tue, 27 Jul 2004 01:54:00 GMT

3D for the Rest of Us, Part 2: Transforms

Halfbrite — Mon, 09 Aug 2004 01:45:00 GMT

3D for the Rest of Us, Part 2: Transforms

Halfbrite — Mon, 09 Aug 2004 01:54:00 GMT

re: 3D for the Rest of Us, Part 1: 3D Coordinate System

Capo — Tue, 10 Aug 2004 16:19:00 GMT

In mathematics, conventional 3D coordinate systems use y as the horizontal axis, z as the vertical axis, and x as the "depth" axis. Why wasn't this convention used?

re: 3D for the Rest of Us, Part 1: 3D Coordinate System

kingsley — Wed, 11 Aug 2004 09:01:00 GMT

I would love u to tutor me more on site building and making my site look superb.

re: 3D for the Rest of Us, Part 1: 3D Coordinate System

BCampney — Fri, 13 Aug 2004 23:36:00 GMT

Excellent tutorial. This really brought home the details of using Avalon 3D transforms. I am much better prepared to work on my 3D projects! I am looking forward to the rest of the articles in this series.

V

Mikael S — Mon, 16 Aug 2004 22:42:00 GMT

V

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