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Re: 3D array from surfaces? [message #60389 is a reply to message #60386]

Tue, 13 May 2008 16:52

Rick Towler
Messages: 821
Registered: August 1998

Senior Member

Mike wrote:
> On May 13, 1:00 pm, David Fanning wrote:
>
>> Maybe you can get some inspiration from this article:
>>
>> http://www.dfanning.com/graphics_tips/mesh.html
>
> Yep - That is just the opposite of what I want to do. What I'm
> looking for is the inverse of Shade_Volume. I suppose this really
> boils down to finding the intersection of a plane and a mesh
> surface... I'll mull it over tonight and see what comes up...

I have to admit that I am a bit confused as to what exactly you need but
you'll probably want to look here:

http://www.realtimerendering.com/int/

My guess is that you'll want to sweep a plane orthogonal to the z axis
from min(z) to max(z) testing for tri/plane intersections. Looking at
that page, the code for tri/plane intersection testing isn't online but
there are at least a few for tri/tri so you could simply use one of
those and make the one tri really big.

HTH's

-Rick

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[Message index]

		Re: 3D array from surfaces? By: David Fanning on Wed, 14 May 2008 07:06
		Re: 3D array from surfaces? By: Mike[2] on Wed, 14 May 2008 07:01
		Re: 3D array from surfaces? By: Mike[2] on Wed, 14 May 2008 06:43
		Re: 3D array from surfaces? By: Karl[1] on Tue, 13 May 2008 19:53
		Re: 3D array from surfaces? By: Rick Towler on Tue, 13 May 2008 16:52
		Re: 3D array from surfaces? By: David Fanning on Tue, 13 May 2008 14:54
		Re: 3D array from surfaces? By: Mike[2] on Tue, 13 May 2008 14:47
		Re: 3D array from surfaces? By: David Fanning on Tue, 13 May 2008 10:00

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