Problem Environmental Map rendering in Mental Ray

uhofmann · July 8th, 2008

Hi To all,

since a few days i tried to solve a problem but i don't get the point:

Software: 3dmax 2009 design
Render: hosted Mental Ray
I want to render a house, with mr_sun and mr_sky, i added the mr_physical_Sky shader ... in enviromental render setting. this works.
But i want a picture with clouds, so í added instead of the mr_physical_Sky a bitmap with blue sky and clouds, but when i render the background is black instead of the clouds and blue sky.
Do i unterstand something wrong??
Thanks for helping
Uwe

SandmanNinja · July 8th, 2008

I think you have to crank the multiplier on the output of the cloud jpg REALLY HIGH....

Just to make sure I understand, you've used a custom map in the mrPhysical Sky, right?

Justin Hunt · July 8th, 2008

for a full and detailed expination of whats really going on read Master Zaps Blog
http://mentalraytips.blogspot.com/

look for "Why does mental ray Render (my background) Black? Undestanding the new Physical Scale settings "

jhv

Ky Lane · July 8th, 2008

What I do is, use the mrphysicalsky, and add the bitmap to the haze channel, and up the bitmaps output to between 10-20....

uhofmann · July 9th, 2008

Quote:

Originally Posted by SandmanNinja

I think you have to crank the multiplier on the output of the cloud jpg REALLY HIGH....

Just to make sure I understand, you've used a custom map in the mrPhysical Sky, right?

Yes custom map on mrPhysical Sky.

uhofmann · July 9th, 2008

Now it works - the high output solved it and you have to adjust in the bitmap/map output the RGB curve to control the kontrast and the gamma.

But the next effekt which appears in my mockup installation ist that the skybitmap dont mirrors in mirror surfaces . - funny ne?

the material on the sphere in the attached picture is chrome, you see it
reflects the basic skycolor and the ground but not the skybitmap.

SandmanNinja · July 9th, 2008

Yeah, I brought in one of the sunset panoramics from the ArchMat folder and made the multiplier 20. Not as vibrant as a HDRI, but it offers some variety over the solid blue.

Ky Lane · July 9th, 2008

Well, heres my solution if interested, based on this

Sorry, 3DsMax2009Dx86 and MR...

uhofmann · July 9th, 2008

So works now tried different sun settings. The only thing i didn't found realy out. how you did in the scene the lensflare.

uhofmann · July 9th, 2008

here also some pics

July 8th, 2008	#1 (permalink)
uhofmann Member Join Date: Nov 2007 Location: Utrecht Posts: 41 Name: Uwe Hofmann	Problem Environmental Map rendering in Mental Ray Hi To all, since a few days i tried to solve a problem but i don't get the point: Software: 3dmax 2009 design Render: hosted Mental Ray I want to render a house, with mr_sun and mr_sky, i added the mr_physical_Sky shader ... in enviromental render setting. this works. But i want a picture with clouds, so í added instead of the mr_physical_Sky a bitmap with blue sky and clouds, but when i render the background is black instead of the clouds and blue sky. Do i unterstand something wrong?? Thanks for helping Uwe __________________ Reality is not what you see, reality is what you Want to see. http://www.make3d.eu

July 8th, 2008	#2 (permalink)
SandmanNinja Moderator Join Date: Mar 2007 Location: Ballarat, Victoria, Australia Posts: 1,375 Name: Joel Callahan	Re: Problem Environmental Map rendering in Mental Ray I think you have to crank the multiplier on the output of the cloud jpg REALLY HIGH.... Just to make sure I understand, you've used a custom map in the mrPhysical Sky, right? __________________ -SandmanNinja website

July 8th, 2008	#3 (permalink)
Justin Hunt Veteran Member Join Date: Jan 2005 Location: Brisbane Age: 34 Posts: 1,367 Name: Justin Hunt	Re: Problem Environmental Map rendering in Mental Ray for a full and detailed expination of whats really going on read Master Zaps Blog http://mentalraytips.blogspot.com/ look for "Why does mental ray Render (my background) Black? Undestanding the new Physical Scale settings " jhv

July 8th, 2008	#4 (permalink)
Ky Lane Veteran Member Join Date: Aug 2006 Location: Brisbane, Australia Age: 31 Posts: 924 Name: Ky Lane	Re: Problem Environmental Map rendering in Mental Ray What I do is, use the mrphysicalsky, and add the bitmap to the haze channel, and up the bitmaps output to between 10-20....

July 9th, 2008	#7 (permalink)
SandmanNinja Moderator Join Date: Mar 2007 Location: Ballarat, Victoria, Australia Posts: 1,375 Name: Joel Callahan	Re: Problem Environmental Map rendering in Mental Ray Yeah, I brought in one of the sunset panoramics from the ArchMat folder and made the multiplier 20. Not as vibrant as a HDRI, but it offers some variety over the solid blue. __________________ -SandmanNinja website

July 9th, 2008	#9 (permalink)
uhofmann Member Join Date: Nov 2007 Location: Utrecht Posts: 41 Name: Uwe Hofmann	Re: Problem Environmental Map rendering in Mental Ray So works now tried different sun settings. The only thing i didn't found realy out. how you did in the scene the lensflare. __________________ Reality is not what you see, reality is what you Want to see. http://www.make3d.eu

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