CGTalk - apply bump map to reflection but not diffuse..?

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earwax69

03-29-2010, 03:29 AM

Hi, I have an object with blurred reflection. Using real blured reflection is just too long to render and I get nice result using a noisy bumpmap. Here my problem; My reflection with the bumpmap is perfect however the diffuse is going noisy, I get dark little dots everywhere now. Is there a way to apply the bumpmap only to the reflection?

Maybe I should do it in 2 passes (diffuse pass with no bump+reflex with bump) but im not use with passes rendering and have no idea how to make them and combine them in AE.

Any good nodes trick to do that in 1 pass??

Thanks

Carm3D

04-03-2010, 03:03 PM

There's a very old plugin from Worley that did this called G2. But I wouldn't recommend getting this. It's pretty out-dated. I suggest knuckling down and learning how to composite in AE (or another program).

I have a few videos on YouTube about compositing.

Compositing Intro Part 1 of 2 (http://www.youtube.com/watch?v=oKfD9TGv7Oo)

Compositing with Ambient Occlusion Part 1 of 2 (http://www.youtube.com/watch?v=gjrlQG7yuqw)

gerardo

04-06-2010, 11:31 AM

Yes, there are ways to apply the bump map only to reflection, but you'll need to do it in the Surface Node Editor. There, you could use your favorite Reflection node and convert a bump output into a normal output with DP_Bump Normal node, and plug this output to Normal input of the Reflection node, which is connnected to Reflection shading in the Surface Root. If you don't have the DP_Kit that includes the Bump Normal node (the website is down momentarily), you could subtract the bump map from the Normal output of Spot Info node, in this way:

http://imagic.ddgenvivo.tv/forums/reflections/bump2normal.png
You could use the same texture node to adjust the diffuse component independently.

Btw, some time ago I shared a node setup for soft reflections through micro-textures:

http://imagic.ddgenvivo.tv/forums/microptrfltn.png

Instead of the Image node you can use also procedural textures. The setup makes use of motion blur, but if you don't want/need mBlur, you can use instead/also the Pom's Take Samples node.

Gerardo

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04-06-2010, 11:31 AM

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