Graphics Programs Reference
In-Depth Information
1. Go to the
Render
window under the
Properties
panel. In the
Sampling
tab, set
Samples
to
100
both for
Preview
and
Render
(they are set to
10
by default).
2. Set the
Clamp
value to
1.00
(it's set to
0.00
by default). Go to the
Light
Paths
tab and set the
Filter Glossy
value to
1.00
as well. The resulting
rendered image, as shown here, is now a lot more smooth and noise free:
3. Save the blend file in an appropriate location on your hard drive with a
name such as
start_01.blend
.
Samples
set to
10
by default are obviously not enough to give a noiseless image,
but are good for a fast preview. We could also let the
Preview
samples as default
and increase only the
Render
value, to have longer rendering times but a clean im-
age only for the final render (that can be started, as in BI, by pressing the
F12
key).
By using the
Clamp
value, we can cut the energy of the light. Internally, Blender con-
verts the image color space to linear. It then re-converts it to RGB, that is, from
0
to
255
for the output. A value of
1.00
in linear space means that all the image values
are now included inside a range starting from
0
and arriving to a maximum of
1
, and
that values bigger than
1
are not possible, so usually avoiding the fireflies problem.
Clamp
values higher than
1.00
can start to lower the general lighting intensity of
the scene.
The
Filter Glossy
value is exactly what the name says, a filter that blurs the glossy
reflections on the surface to reduce noise.
Be aware that even with the same samples, the
Rendered
preview not always has a
total correspondence to the final render, both with regards to the noise as well as to
the fireflies. This is mainly due to the fact that the preview-rendered 3D window and
