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Old 2nd May 2008, 07:56 AM   #1
Malekovits
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Default Artifacts

Hi all!

I have this question for years....
Create something, like ball (2sided), make a single vertex in the center, select it(so you have the selection box) and then look at selection(the single vertex) and zoom in again and again and see the results. If you zoom for a long watch the selection box how it looks like, and of cource how the ball seems. Why this? I have this question because I am developing my own graphic library...
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Old 2nd May 2008, 08:08 AM   #2
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Default Re: Artifacts

About the vertex and the selection box: wrong. Just don't put it in the center. Put it anywhere else you want, and inside the ball so you can see the results.
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Old 2nd May 2008, 02:24 PM   #3
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Default Re: Artifacts

Also turn on anti-alias....
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Old 2nd May 2008, 06:40 PM   #4
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Default Re: Artifacts

cant honestly tell you why, but can i ask why it matters?
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Old 2nd May 2008, 06:42 PM   #5
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Default Re: Artifacts

or am i doing something wrong in your explination?
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Old 2nd May 2008, 07:01 PM   #6
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Default Re: Artifacts

It doesn't bothers me. I 'm just curious why is this happening. As I have realized it seems somehow like the playstation one (the trembling polygons).....
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Old 2nd May 2008, 07:10 PM   #7
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Default Re: Artifacts

i see, my educated guess would be, the 3d scene is pretty much like a universe, and you cannot zoom further than the middle of it, and the computer has a hard time realising this and still draws the polygons but is unsure of the level of zoom and the amount to draw. as you get closer to the centre the axis go to 0.000000 and so on so can't draw them properly, but thats just a guess!
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Old 2nd May 2008, 07:27 PM   #8
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Default Re: Artifacts

Imagine that 3d world is a cubic world. the more you zoom the closer you come the smallest cubes that the world is made of. Playstation i thing that it's 3d world wasn't very precisely as a program's. etc:

-> playstation : 0.000
-> ac3d : 0.000000

So, logicaly, the more you zoom:
0.000000
0.00000
0.0000
0.000
0.00
0.0
....
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Old 2nd May 2008, 07:31 PM   #9
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Default Re: Artifacts

sound reasoning my freind, i guess we have turned a corner tonight!
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Old 2nd May 2008, 07:55 PM   #10
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Default Re: Artifacts

I am making my own gl and i somehow know what is going on. But the artifacts are not resonable. Ok about wrong geometry and trembling. But artifacts and even more the effect of antialias are not right.... Perhaps Andy can tell us what realy is going on...
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