Hi guys! I’m using 3d max 2013 and rendering with mental-ray.
I got this problem:
When I render it appears on the floor some granular reflections.. I don’t understand what’s the problem. I neither know if it’s a problem of light or material. I post you some image.
As material i use a standard material with a diffuse and a bump.
As light I’m using both GI and Final gether. I use mr sun and sky portal each windows.
Someone know the reason of this problem?
Thank you!

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Ditch standard materials, A&D are best for architectural scenes in mental ray. If the problem persists increase the glossy samples in your floor material. If you can’t it’s because the glossiness is set to 1, reduce it and you can now play with the samples.

Hope that helps.

No way… I changed material and I used “Flooring/Tile Square - Blue-Gray” tried to increase to the maximum the glossy samples but it’s still not working fine. I tried to increase also the glossy precision without any success. :(

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I remember having an issue like this in the past caused from the “mr Physical Sky” shader. Drag the Physical Sky Map into a material editor slot and in the Sun Disk Appearance menu make the Disk Intensity = 0,0 and render again.

ivan

No, that is not the cause of the issue.
Probably MR is trying to say that it is not able to store in the geometry the photons set in the Light properties menu, or cannot reach the value set there.
Is the MR Sun the only light source in the scene? If yes, use the Photon target option and make the radius considerably smaller than the scene; could be a little bit bigger than the window for example. Or create a Plane object below the model to catch the photons bouncing astray. That done you will probably get rid of the messages bit the main issue will remain.
Try using the tile preset of an A&D material instead of Flooring/Tile Square.
The last option would be to post the max file simplified and zipped here.
Someone will take a look and surely will find a kind of working solution.

ivan

nothing change… i post you the file.
If someone can help me and try to found out the error i will be glad! :)

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problem_of_light.zip.zip

Were you trying to attach a file to your post above? It didn’t make it…
Please see this post for help with attachments.

Max 4.2 through 2014, Composite 2014.
XP-64 (SP2).
nVidia 9800GTX+ (512MB) (Driver 314.22).
i5-3570K @ 4.4GHz, 8Gb Ram, DX9.0c.

Sorry, didn’t have the time to take a look into the file immediately.
Actually the issue is caused from the Daylight it is just corrupt.
I don’t know how it happened but probably you scaled it or transformed it or maybe imported it from somewhere; in one way or another it doesn’t work the right way.
Therefore the error messages you are getting.
All I did was to create a new daylight system and a big plane object beneath the house
to catch the bouncing sun photons, also I checked the scanline option in the render menu.
(See Attachments)
This is a further simplified version of your file; feel free to merge all the missing objects and continue your work.
Just for info, the Autodesk materials are good and easy to manipulate but they are terribly slow. Actually I prefer the A&D materials; in my test rendering the pro materials took 1 min 24 sec to render; the A&D only 51 sec.

Cheers and keep going!

ivan

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test02_1.zip

Thank you Ivan! :)