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Author Topic: AA makes a wierd difference  (Read 2438 times)

flametiger74

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AA makes a wierd difference
« on: March 31, 2008, 02:28:40 am »

Rendered in 0.95 for some reason the rendered one with Anti-aliasing came out very different  than w/out AA
here's with

and w/out

The wall is what I'm wondering about the most. It seems as if it's messed up. It's a texture w/ a bump map.
Thanks.
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Alpha2

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Re: AA makes a wierd difference
« Reply #1 on: March 31, 2008, 03:14:03 am »

Wow. I was just playing Crisis Core on the PSP connected to my TV and it got me thinking about trying animations without AA to make it look more like a game. This really makes me give that a second thought!

It looks like turning off AA also turns off perspective correction. like when you see old PSone games and wall textures all go off in funky directions.
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hihosilver

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Re: AA makes a wierd difference
« Reply #2 on: March 31, 2008, 04:14:34 am »

The problem is with the bumpmap.  It seems that without AA the bumpmap is rendered differently than with AA.  I can't say much about how it works, but I believe that the antialiasing actually smooths over the bumpmap a bit or something.
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thecolclough

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Re: AA makes a wierd difference
« Reply #3 on: March 31, 2008, 09:24:55 am »

i had a similar issue back in 2006 when i rendered a shot of a city for a short movie, because i had textures on all the tower blocks, rather than bothering to model all those hundreds of windows  :P.  here's a still, with AA on:

(sorry, don't have a non-AA available!)

i didn't have any bump maps, but i still got a significant difference between AA and non-AA renders.  i suspect it's an issue with all types of texture, but perhaps more so with bump maps due to the fact that they actually change the shape of the object surface?

- colclough
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flametiger74

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Re: AA makes a wierd difference
« Reply #4 on: March 31, 2008, 11:09:24 am »

Okay. Well I'm going to to be rendering my final scene in AA so really I don't think it will be a problem. I'm just wondering why it did it.
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