View Full Version : Aliasing in Refracted Textures

06 June 2009, 12:06 AM
I have some objects which are floating inside a jar of water that are rendering out with really bad aliasing, I have to crank my sampling up to like 5 or 6 to get rid of it, which takes ages. All materials are mia_material, the floating objects have diffuse and bump textures. I'm assuming this is happening because Mental Ray applies the refraction after anti-aliasing and magnifies the result, is this correct? Is there any other way to deal with this aside from cranking the sampling up?

06 June 2009, 12:12 AM
Anybody have this problem before?

06 June 2009, 04:13 PM
Are you using interpolation for the refraction in the mia material?

06 June 2009, 12:08 AM
Are you using interpolation for the refraction in the mia material?

No, none of my shaders are using interpolation.

06 June 2009, 05:53 PM
which lights u are using? I have had that problem with Area Lights and Shadwos on. Raise the Low Samples of the Light. Then u should get better results.

07 July 2009, 04:32 PM
I'm also having a problem that may be similar to yours. Here's an example:

It happens just when there's a bump in the material being refracted. I'm using Sun/Sky (FG only), MIAs with MAP images, which are all mipmap filtered. When I use a blinn for the glass it doesn't happen, only with mia and dielectric.

Edit - No interpolations used

Has anyone come across this?

07 July 2009, 09:44 PM
What type of filtering are you using with your bump image?

07 July 2009, 11:26 AM
I've tried a bunch of filter types, all with the same result, but in the above image it has elliptical.

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07 July 2009, 11:26 AM
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