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Example 1: Noise vs Speed

You can use the QMC sampler as global quality control, particularly the Early termination parameters.

For lower quality:

• increase the Amount
• increase Noise
• reduce Min samples

For higher quality:

• decrease the Amount
• decrease Noise
• increase Min samples

These controls have effect on everything: DOF, GI, glossy stuff, area lights etc.

Color mapping mode also affects render times and sampling quality, since VRay tries to distribute samples based on the final image result.

The images below have the same subdivs for DOF (10 subdivs), GI (50 subdivs, Direct method), glossy reflection (50 subdivs, no interpolation), area light (10 subdivs) for all images. Notice how changes in the QMC sampler parameters affect the image quality and render time (click the images to enlarge them):

	Early termination settings			Render time
	Amount	Noise	Min samples
	0.85	0.005	15	8m 43.7s
	0.95	0.01	5	4m 34.5s
	0.95	0.05	5	1m 35.8s
	0.99	0.05	5	0m 49s
	1.0	0.1	5	0m 28.6s

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