Problem with Distortioned lines

[juan.carlos.rioja]

hello guys. I just render a scene and have a problem with the lines. How can I make them look more "straight"??? I'm using Image Sampler > Adaptive QMC > MinSub 24_ MaxSub 48... or should I use Adaptive Subdivision???

[juan.carlos.rioja]

Re: Problem with Distortioned lines

I'll set a higher image... sry about the previous one :-\

[dcauldwell_cg]

Re: Problem with Distortioned lines

First try setting the anti-ailiasing filter 'on'. If that still doesn't work, then check out Mado Kitchen settings http://asgvis.com/index.php?option=c...10503#msg10503

I fact just check out Mado's settings anyway - just look at the results!

David

[juan.carlos.rioja]

Re: Problem with Distortioned lines

Hi David. I'm using the anti-ailising with 0.5 just because I don't like the blurry effect that produces on my renders. Is there a way to avoid this???

[dcauldwell_cg]

Re: Problem with Distortioned lines

You shouldn't get a blurry effect. Look at Mado's images. He uses anti-ailiasing (Catmul rom).
Personally, for final renders, if you want better quality, render to a larger output.

David

[juan.carlos.rioja]

Re: Problem with Distortioned lines

I usually use the "area" option for anti-ailiasing and this produces a blurry effect. But with the catmul rom it doesn't happened. why??? can you explain me these options???

[dalomar_cg]

Re: Problem with Distortioned lines

Certain AntiAliasing filters will take an input that will determine the amount, or strength, of their affect. The Area filter will take a value, expressed in pixels, that will determine how many pixels are used to generate the end result of a given pixel. What that means is that if I specify a number greater than 1, then I will be taking more pixels into account, and therefore blurring the end result. If I specify a value less than one, then that will effectively sharpen the image by subsampling that pixel.

CatmullRom works of a specified algorithm and does not take a value to determine its affect. I'm not too familiar with the algorithm, but I suspect that it will vary the strength of the sharpening based on the contrast in that region of the image.


Note that all filters are a post process to the actual antialiasing of the image. Since most filters will actually need the information from more than one pixel to do their calculations, that means that filters, even if they decrease image quality via blurring, will add time to the rendering. Because the filters work in this way, you can also add a filter to an image via image editing software like Photoshop and achieve pretty much the same result. The advantage for applying the filter at rendertime would be that the filter can take the subsample from the actual rendering/scene information which would make them more accurate than a filter applied in post (this is especially true with sharpening filters)

[juan.carlos.rioja]

Re: Problem with Distortioned lines

thanks Dalomar... you are always helpfull ;D