Hi-
When I create an AO pass I am not getting white and black. My method for creating the AO pass is with a material override with vray light material and a vray dirt in the slot. I am using white and black for my colors and I have my gi and vray camera exposure turned off. The pass comes out gray. Am I missing a step. I have also used the AO pass script from the web and it comes out equally gray.
Color Mapping maybe (i.e., reinhard,etc.)? What are you rendering - interior or exterior? What’s your AO radius?
color mapping is linear 1,1,1. It’s an exterior scene with an AO radius of 8"
Camera Vignetting?
Whenever I use a Physical Cam it always turns out grey. I just use a levels on it in post.
I usually have vignetting off so that isn’t the case. Lehm. I too fix in post, but I don’t hear anybody else fixing it in post so I thought it was just me.
I use AO a lot for my images, maybe too much. They’re never gray unless my settings dictate it so I’m not sure what could be causing it. If you want to post a scene I can take a look, I’m on Max 2009 though.
Turn off the camera exposure.
He already has it off…
Render elements>select Vrayextratex>drop a vraydirtmap there
+1, this should work pretty well.
Increase ISO in vray camera to something around 1000.
hmmm… it seems that the gray isn’t consistent. I broke down my scene and ran it again, this time it looks great. Sometimes, it seems, that when I use saved materials and and scene settings things don’t work as expected. Anyway… all is good and thanks for the help.
Didn’t know you could do that! Is there a way to make the background white? I can only get it to be black using this method.
What is the benefits of using the Vrayextratex?
Well for one you can render your main and ao pass at the same time.
nice! worked great!!!
One thing to be cautious about though is if you’re using high dmc settings to get clean aa, the vray dirt in your extra tex will also be calculated using these settings. It’s often overkill and can slow your render down a lot - The AO is being added on to the calculations of everything else so you don’t get it for free. I find that if you use adaptive subiv aa and vray override, set your vray dirt samples to 24 and the subdiv aa makes it render damn quick.
Another thing to keep in mind with the extraTex RE is that it’s not color mapped (AFAIK). So your Ambient Occlusion pass generated with an ExtraTex RE may appear much darker than one generated in the RGB color pass. Just something to keep in mind.
yes, can this be done easily? can always do it in post or add backplates and such, but it gets messy…