Grainy Render

pwharton · April 24th, 2008

Attached is a file I am working on and trying to learn Mental render on. It’s not a finished scene just setting it up and doing some testing renderings. The problem is I can’t get rid of the grainy look of the walls and columns. I am using final gather set to Basic. Please let me know if you need any other of my settings.

manta · April 24th, 2008

its your bump map...

pwharton · April 24th, 2008

There is no bump setup for the paint finish. It' rendered fine at first, but as i was fine tuning the settings something changed along the way. I've been retracing my steps looking for an answer.

manta · April 24th, 2008

really ???
can you render a closeup of the wall ?
it really looks like you have a bump map, noise to be specific...

pwharton · April 24th, 2008

Here is the close up. I uncheckek the jitter box under render hoping that would do it. it does not.

manta · April 24th, 2008

Sorry too small to tell anything...

pwharton · April 24th, 2008

Sorry about that, here is a larger size and the rending setting if that will help.

SandmanNinja · April 24th, 2008

My eye was drawn to the feature wall above the fireplace. Maybe that's what Manta was doing as well? That definately looks like something in the bump slot.

But the closeup is a different wall.

What saved my life, mind and sanity was Brian's Mental Bout Max Mental Ray tutorials. I have them all. He starts off walking you from converting a scene from scanline to mental ray and then the subject gets deeper and deeper and is thoroughly explained.

www.mentalboutmax.com

3DS itself ships with some pretty good tutorials on mental ray, too.

I use the preset values in DRAFT and a resolution of 640x480 when I'm starting out (draft for speed, and no smaller than 640x480 so I can see some details). When the overall solution looks close, I switch to low.

For a WIP here, I switch to 800x600, MEDIUM preset, and tweak the settings a bit. I figure that the final render to the client is going to be HIGH or VERY HIGH and a lot bigger, so to get a fair amount of feedback, make a WIP render that's big enough to see detail and high enough in quality to get rid of noise, etc.

shaneis · April 24th, 2008

Looks like a shadow map artifact, possibly an AO artifact or even FG settings too low. Check the samples for the lights and material AO, also test the FG by increasing the FG and rendering a region on the offending wall. See if that helps.

pwharton · April 24th, 2008

Ok First, yes in the detail above the fire place is a bump map, it still needs to be tweaked.

As for the original problem after looking at everything of course it the last thing I looked at, the MR Omni. I had set the radius of the light in the “area light parameter” panel to between 10’ to 100’ for some of the lights in the model assuming it would set the range of influence for the lights before it falls off (sort of like a standard Omni light??) The Max help does not explain what this does very well. If you know how this is supposed to be used please let me know.

I will look into the training Video’s as soon as I can. Right now I have the “Realistic Architectural Visualization with 3ds max and mental ray” book. I have done the first few chapters so far, so I still have a ways to go with this book.
Thanks for all your help, I’ll post the Final once I get the textures and backgrounds worked out.

April 24th, 2008	#2 (permalink)
manta Veteran Member Join Date: Dec 2004 Location: Ft. Lauderdale, FL Posts: 1,161 Name: william york	Re: Grainy Render its your bump map... __________________ DESIGN FORWARD http://www.mantastudios.com

April 24th, 2008	#3 (permalink)
pwharton Member Join Date: Jan 2006 Location: Chicago, IL. Posts: 60 Name: Phillip Wharton	Re: Grainy Render There is no bump setup for the paint finish. It' rendered fine at first, but as i was fine tuning the settings something changed along the way. I've been retracing my steps looking for an answer.

April 24th, 2008	#4 (permalink)
manta Veteran Member Join Date: Dec 2004 Location: Ft. Lauderdale, FL Posts: 1,161 Name: william york	Re: Grainy Render really ??? can you render a closeup of the wall ? it really looks like you have a bump map, noise to be specific... __________________ DESIGN FORWARD http://www.mantastudios.com

April 24th, 2008	#6 (permalink)
manta Veteran Member Join Date: Dec 2004 Location: Ft. Lauderdale, FL Posts: 1,161 Name: william york	Re: Grainy Render Sorry too small to tell anything... __________________ DESIGN FORWARD http://www.mantastudios.com

April 24th, 2008	#8 (permalink)
SandmanNinja Moderator Join Date: Mar 2007 Location: Ballarat, Victoria, Australia Posts: 1,298 Name: Joel Callahan	Re: Grainy Render My eye was drawn to the feature wall above the fireplace. Maybe that's what Manta was doing as well? That definately looks like something in the bump slot. But the closeup is a different wall. What saved my life, mind and sanity was Brian's Mental Bout Max Mental Ray tutorials. I have them all. He starts off walking you from converting a scene from scanline to mental ray and then the subject gets deeper and deeper and is thoroughly explained. www.mentalboutmax.com 3DS itself ships with some pretty good tutorials on mental ray, too. I use the preset values in DRAFT and a resolution of 640x480 when I'm starting out (draft for speed, and no smaller than 640x480 so I can see some details). When the overall solution looks close, I switch to low. For a WIP here, I switch to 800x600, MEDIUM preset, and tweak the settings a bit. I figure that the final render to the client is going to be HIGH or VERY HIGH and a lot bigger, so to get a fair amount of feedback, make a WIP render that's big enough to see detail and high enough in quality to get rid of noise, etc. __________________ -SandmanNinja website

April 24th, 2008	#9 (permalink)
shaneis Veteran Member Join Date: Aug 2007 Location: Sydney Posts: 623 Name: Shane Neal	Re: Grainy Render Looks like a shadow map artifact, possibly an AO artifact or even FG settings too low. Check the samples for the lights and material AO, also test the FG by increasing the FG and rendering a region on the offending wall. See if that helps.

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