Why is rendering showing grainy speckles? Revit 2016 Mental ray render

[David125]

I'm getting these little blue speckles on a TV monitor in my rendering. It is a reflection of a whiteboard on an adjacent wall. The material being rendered is glass, cast, gray. The settings are in the render sample I uploaded.

[cbcarch · Accepted solution]

From my experience, the speckles are a result of:

1. A reflective material, such as glass or hi-gloss paint, metal, or wood finish, etc--which the render engine is bouncing "light photons" off of,

and it simply can't keep up with the amount of information it needs to process--so, try making the material a bit less reflective. (which brings up #2:)

2. Render setting is not high enough. If you need super-glossy or reflective materials, you will need higher render settings.

3. Lighting--try experimenting with different light settings and see if it makes any difference.

I have also found that over the past release or two of Revit--the change to Autodesk's own "raytracer" from the older Mental Ray engine

has made it harder to get high quality/photo-realistic results.

You might try Render in Cloud if you are on subscription, and use the highest setting and see what the results are.

[Corsten.Au]

Change the whiteboard frame material to " non metallic " .

Keep non reflective, that should solve the problem.

[David125]

No solution was found

[cbcarch]

OK--If you tried all of the suggestions in my post, can you share an image of the results so we can help troubleshoot further?

[David125 · Accepted solution]

Didn't see your recommendation till just now. I changed the frame of the whiteboard from aluminum to plain white. That did the trick. It's curious to me that the aluminum did not have any reflectance characteristics. Is it just that it was metallic that caused the problem? My concern now is when I have something I need to be metallic and reflected on a screen. Do I then do 2 renderings with the appropriate settings for each then photoshop them together?

Just a thought.