Graphics Programs Reference
In-Depth Information
Reviewing the image sampling render
As things are looking good at this point, the only real problem that needs to be solved
by image sampling would the same one that we have identified on a number of oc-
casions already: noise. We do though have a choice as to how we go about solving
the noise problems we see here, as most of the issues that can be spotted on close
inspection are material based.
This means we can either increase the number of subdivs being used for effects
such as the frosted glass at the material level, or we could force a global cleanup of
the scene using the image sampling controls themselves. As doing this would also
clean up any noisy soft shadows in the scene, this is the initial approach we will take.
This will still leave us with the option of going in and giving any problematic materi-
als in the scene a final tweak should we need to do so. To do that, let's perform the
following steps:
1. In the
Image sampler (Antialiasing)
rollout of the option editor, ensure that
the
Type
in the
Image Sampler
section is set to
Adaptive DMC
.
2. Then, in the controls immediately below it, set the
Min subdivs
value to
1
and
Max subdivs
to
16
.
These settings give V-Ray the option of using a maximum of 256 samples per pixel
wherever it deems them necessary, while at the same time allowing it to drop all the
way down to a minimum of 1 sample per pixel whenever it can. This can save on a lot
of unnecessary render time as V-Ray now has the option of
only
using extra samples
whenever it becomes really necessary. The control that will make the determination
as to when extra samples are applied can be found in the rollout just below, this be-
ing the
DMC sampler
control.
You can see in the
Image sampling
rollout that, by default, the
Use DMC sampler
thresh
control is enabled. This tells V-Ray to make use of the threshold controls
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