3D?

[Lynch, Jonathan]

I believe that in part it depends on whether you are using the
points/splines/surfaces approach or the 3D pixel approach.

The points/splines/surfaces approach uses much less data, although the
math is a bit more complex. I know that the 3D programs I have played
with use points/splines/surfaces.

I had the idea to store the data as 3D pixels, but where you only store
info for pixels that exist. For a small object, calculating the first
intersecting point between a line extending from the notional viewing
window and the object should not be too hard, and should allow the use
of fast commands like intersect.

But even for that, think about an image that is 100x100 - that's 10,000
pixels, each of which requires some calculation to figure out. Pixel by
pixel image processing in transcript is not that fast. 

-----Original Message-----
From: use-revolution-bounces at lists.runrev.com
[mailto:use-revolution-bounces at lists.runrev.com] On Behalf Of Dennis
Brown
Sent: Friday, July 22, 2005 3:25 PM
To: How to use Revolution
Subject: Re: 3D?

Rev should be able to handle these calculations directly as long as  
you are not talking about thousands of points.

Dennis

On Jul 22, 2005, at 3:04 PM, Lynch, Jonathan wrote:

> I have looked into this a little bit, and here is what I concluded:
>
> - An image with custom properties
>     - one customproperty contains the 3D data
>     - another customproperty contains the viewing perspective data
> (zoom,tilt,twist,pan,veiwpoint,etc...)
> - An external to do the math required for various moves
> - On opencard rev sends the 3D dataset to the external
> - When any movement is made, the viewing perspective information is
> changed, and you send the new viewing perspective information to the
> external, which does the math to calculate the imagedata for the  
> image,
> then returns that imagedata to Rev
> - Rev then sets the imagedata of the image to the new imagedata
>
>
> The math for doing these computations is not quite as bad as I thought
> it would be, and there are a number of websites on the Web that  
> explain
> it. However, a huge number of calculations must be performed, which is
> why I suggest an external.
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