V-Ray DMC Calculator
A tool to demonstrate the connection between
V-Ray's Image Sampler and DMC Sampler
- July 2014
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.
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)
D. Adaptive Amount
E. Global Subdivs Multiplier
F. Min Samples
Local Subdivisions (From a Light / GI / Material / etc)
Image Samples (AA)
DMC Samples (Per Light / GI / Material / etc)
Per Image Sample:
Formula: G2 * E / H
Currently: G2 * E / H
Raised by Min Shading Rate (C)
Formula: J * (1 - D)
Currently: J * (1 - D)
Lowered by Max DMC Samples (J)
Raised by Min Samples (F)
Formula: H * J
Currently: H * J
Formula: I * K
Currently: I * K
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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