Anti-aliasing on an RTT

vnguyen · Post by **vnguyen** » Thu Oct 19, 2006 8:46 pm

Hi, I'm having an anti-aliasing problem when using RTT texture.

When I render the 3D model on the screen, it looks fine and it has anti-aliasing. However, when I render the 3D model to a texture and then render the texture to the screen, I don't notice the anti-aliasing anymore. I would expect the 2 rendering technique to yield the same result right? Can anyone provide me sone insight on this please.

JP · Post by JP » Thu Oct 19, 2006 9:28 pm

What dimension is your RTT?

vnguyen · Post by **vnguyen** » Mon Nov 13, 2006 8:24 pm

512x512

JP · Post by JP » Mon Nov 13, 2006 9:01 pm

Hmm should look ok in 512x512 i would have thought

Show us some screenies

vitek · Post by **vitek** » Mon Nov 13, 2006 11:38 pm

DirectX does not apply AA when doing RTT. If you apply that texture to an object and render that object, it will be the antialiasing will be performed at that time. If you really need a anti-aliased texture of the back buffer, you have to use StretchBlt.

I don't know about OpenGL, but that is the way it is with D3D.

Travis

Redemption · Post by **Redemption** » Tue Nov 14, 2006 1:21 pm

If you're not applying the texture to a mesh, and just showing it on screen, you might want to consider using a viewport instead, those do use AA if enabled.