V-Ray DMC Calculator
A tool to demonstrate the connection between
V-Ray's Image Sampler and DMC Sampler
v2.5
- July 2014
Changelog
v1.0 - March 03 2013 - Public Release.
v1.1 - March 25 2013 - Fixed the 'Adaptive Min Samples' formula to include clipping from the 'Max Secondary Samples' value.
v2.0 - May 22 2013 - Calculator redesign and added Notes section.
v2.1 - June 02 2013 - Fixed the 'Global Subidivs Multipler' formula to multiply the 'Subdivisions' value after being squared.
v2.2 - November 08 2013 - Added the 'Min Shading Rate' value from V-Ray 3.X to the calculator.
v2.3 - November 19 2013 - Fixed the 'Min Shading Rate' formula to no longer affect MIN Secondary Samples (Per Primary Sample) value.
v2.4 - January 30 2014 - Added the 'Divide Shading Subdivs' checkbox from V-Ray 3.X to the calculator.
v2.5 - July 06 2014 - Image Sampler MIN Subdivisions can no longer be accidentally set higher than Image Sampler MAX Subdivisions. General interface and terminology cleanup.
V-Ray Settings
Image Sampler (AA)
A. MAX Subdivisions
B. MIN Subdivisions
C. Min Shading Rate (leave at 1 if using V-Ray 2.X)
Divide Shading Subdivs (leave checked if using V-Ray 2.X)
DMC Sampler
D. Adaptive Amount
E. Global Subdivs Multiplier
F. Min Samples
Local Subdivisions (From a Light / GI / Material / etc)
G. Subdivisions
Image Samples (AA)
Per Pixel:
H.
0 Max
Formula: A2
Currently: A2
I.
0 Min
Formula: B2
Currently: B2
DMC Samples (Per Light / GI / Material / etc)
Per Image Sample:
J.
0 Max
Formula: G2 * E / H
Currently: G2 * E / H
Raised by Min Shading Rate (C)
K.
0 Min
Formula: J * (1 - D)
Currently: J * (1 - D)
Lowered by Max DMC Samples (J)
Raised by Min Samples (F)
Per Pixel:
0 Max
Formula: H * J
Currently: H * J
0 Min
Formula: I * K
Currently: I * K
Notes
This calculator serves to demonstrate the connection between V-Ray's Image Sampler and DMC Sampler, but can also be used to help optimize your V-Ray scenes. Simply input your V-Ray settings and the calculator will show you the resulting Max / Min Image and DMC samples per Image Sample and per Pixel. It will also show the formulas V-Ray uses to arrive at those values.
As of V-Ray 3.1 (3ds Max) this calculator is now implemented directly into the user interface of V-Ray to provide realtime feedback according to your scene's current settings. More info can be found here.
For an in-depth explanation of the inner workings of V-Ray and how the Image Sampler is connected to the DMC Sampler, I highly recommend reading my V-Ray Render Optimization tutorial, and Toni Bratincevic's Demystifying V-Ray DMC Sampler tutorial.
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