white spots on ceilling / max + vray / IM + LC

[frnskm]

Hello everyone, im having an issue on this interior scene, using max 2012 + vray 1.5.

I keep gettin these white spots on the ceilling.

Following are printscreens off all settings.

all lights and materials on scene are setted with at least subdivs 12.

Hope you can help me with this.

tks in advance

[Scott Schroeder]

It helps to post Vray questions in the Vray forum.

 

Typically those spots are caused by incompatible materials/lights. Make sure you have no standard mats with raytrace reflections or Autodesk Pro Materials or Mental Ray lights.

 

Do you get the white spots when you render with a gray material override? You really need to do that as your first check to remove materials from the scene. If the spots go away, then you know it is a material issue. If they remain, it could be a light issue. Start turning off lights and see what happens.

[frnskm]

tks for the reply scott.

i just tried override materials with vraymtl and spots were gone.

you might be right about the incompatible material. but how do i find it?

tks again

[Scott Schroeder]

You go though your materials in your scene? Usually it's a standard material with raytrace reflections. So start looking for those.

In the material editor, browse the "Scene Materials" menu. You can also search for a VrayMaterial Converter on ScriptSpot, but that may not always catch the material.

 

You can also incrementally add/remove objects into your include/exclude options for override material. When the spots go away, you found the object with the offending material. If the spots get smaller or change shape, you've found one of the objects with the offending material. I'd start first with objects you know you didn't model/material, such as things downloaded from the web or other places.

[salvador]

Happened to me before. It's annoying to go all over the scene hunting the culprit but there is no other safe way to do it.

 

On a side note, as Scott said, a similar effect can also be caused by V-Ray light materials with high intensities and /or Direct Lighting function turned on and low sampling. I suggest you check for that as well. IMPE, if you don't really need V-Ray light mats to light things up, don't use them unless you know exactly what you are doing and what to expect.

 

My two cents.