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LehaS
06-17-2005, 09:26 AM
I've got rather theoretical question about sampling in Mental Ray...
I read that Min and Max Samples attributes control number of shading samples per object per pixel based on Contrast Threshold....But what actually those numbers represent? The number of neighbouring pixels of the current rendered one to be examined ? Also what the difference in setting the attributes to :
Min -2 Max 0 and Min 0 Max 2

Pretty lots of questions i have but i guess this info is going to be usefull for many artists

Thanx in advance :)
floze
06-17-2005, 10:01 AM
Have a look over here:

http://www.lamrug.org/resources/samplestips.html

Maybe it helps if you imagine a sample is a subpixel, i.e. a pixel in the pixel. The number of samples taken per pixel is 4^n, where n is the number you specify in the render globals. So a value of 2 in the globals means 4^2 = 16 samples per pixel are taken.
If it comes to negative samples values, undersampling happens. A value of -2 in the render globals means 1 sample is taken every 16th pixel, or 4^(-2) = 0.0625 samples per pixel.
LehaS
06-17-2005, 12:56 PM
Is there any way to visualize samples subdivisions without MR standalone ?

Thanx for great info resourse floze :thumbsup:
floze
06-17-2005, 08:42 PM
Switch the setting 'Diagnose Samples' in the renderglobals under Diagnostics to ON.
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