Fixing "dirty" areas

[beestee]

Below is a render of a recurring problem i have been having which most likely has a simple solution that i just have not found yet.

What parameters do you think i would need to adjust to get less of this "dirty" effect? If you need to see some of my parameters, i can get them. Any hints to start me in the right direction would be much appreciated!

[natty]

i think you need to post your settings

[beestee]

Here are some of my settings, let me know if you need more.

[natty]

hi
first of all change your AA settings to Adaptive (0_3)
increase your Interp Sample to around 45 +
change your Direct computation settings to Subdivs = 10 Depth = 30
in the vray advanced irradiance map parameters make sure you have , check sample visability ticked.
and that should do it.
post it when your finnished

[beestee]

Looks like it is going to take a while to render, but i will post the results as soon as i can after it is done.

So much workflow here leaves me so little time to learn what all of these settings do. Thanks so much for your help natty!

[natty]

your welcome

[cocolas]

I thik the most important thing I found to work well in those situations and in light leaks in general - is to check the "check sample visibility" checked before upping all the other settings - that ususally did the trick alone.....
but than again every situation is different....

I would try each one of those things addictivly testing - instead of just upping every thing at once and get your render times through the roof.....


paul.

[digitalx3d]

Looks like it might be a smoothing issue to me. I've noticed that when using Vray displacement, if it's a flat object that has smoothing groups applied, it renders just like you see. It looks like it has been burned or blackened. Try removing your smoothing groups.

John Pruden
Digital-X

[beestee]

You are correct, the render times have went through the roof and beyond. I can justify it, though, because the client was complaining about that particular flaw, and i told him that it would take an extra amount of time to sort the problem out.

I think i will go back to my other settings where it was taking a total of 45 minutes to calculate the irr. map and render instead of 5 hours. First I will see if the check sample visibility will fix it, then I will slowly increase the recommended settings until it fixes the problem.

Sorry that I cannot show any more of the building than that, my largest client is very touchy about disclosure, but i will post an update of that area once i am done or get stuck again.

Thanks guys!

P.S. About the smoothing. I do not think that would be the problem since the CMU wall behind the metal roof continues down a ways past there. However, if none of these other things work i will surely try that out.

[beestee]

I found out what the problem was, but i never got a chance to re-render with the changes. I had the amount on my bump map set too high.

I also found that VRay does not like it when i check the "check sample visibility" box when i have displacement in the scene, it shoots the render time through the roof.