White Dots - Question…

[craftyste]

I am using Maxwell Render and I keep getting white dots/noise/speckles in my renders. They only seem to appear on white materials such as ‘white pain’ or ‘porcelain’ etc. The persist no matter how long I run the render.

 

The attached image of two interior sculptures (chrome and porcelain) shows the problem. The reflections from the HDRI on the chrome are clear and crisp but the rest is covered in the white speckles.

 

I am new to rendering and teaching myself so if someone could explain why this is happening and how to resolve it that would be great.

Edited May 12, 2010 by craftyste

[Chog Burley]

hi there,

 

not sure what software you are using but i get similar artefacts in mental ray with blurred reflections. increasing samples or interpolation somewhere on the materials maybe?

 

CB.

[craftyste]

Huge thanks for the tip CB... But I am using Maxwell Render so whilst I will take a look at your pointer it would be great to have a specific Maxwell answer from a Maxwell user. Cheers!

[mattclinch]

the dots at the base of the chrome ball certainly looks like an undersampled caustic reflection. i'm guessing that the only way to clean this up with maxwell is to let it render for longer...

[craftyste]

Thanks for that Matt, although I was hoping for better news. That file is a small file and I've rendered it for AGES to try and remove the white dots but no use. If you have change it would be great if you could explain the 'undersampled caustic reflection'... I'm new to all this so any info is a big plus!

Cheers

[Bwana Kahawa]

Try turning down any pure white materials in your scene to a very light grey (I don't do any whites higher than RGB 235,235,235). It'll still look 'white', but reduce the amount of white spots.