8

1304 Chapter 16: Material Editor, Materials, and Maps
Name
Descr iption
Hammersley Spaces samples regularly along the X
axis, but along the Y axis it spaces them
according to a scattered, "quasi random"
pattern. Depending on Quality, the
number of samples can range from 4 to
40. This method is not adaptive.
MAX 2.5 Star
Thesampleatthecenterofthepixelis
averaged with four samples surrounding
it. The pattern is like the fives o n dice.
This is the supersampling me thod that
was available in 3ds Max 2.5.
Regular sampling, as performed by the Adaptive
Uniform and MAX 2.5 Star methods, is more prone
to aliasing than the irregular patterns performed
bytheAdaptiveHaltonandHammersleymethods.
You can set a variable Quality value for the
AdaptiveHalton,AdaptiveUniform,and
Hammersley metho ds. Quality can range from 0.0
to 1.0. A quality of 0.0 is minimal, with about four
samples per pixel. A quality of 1.0 is the highest
possible, with between 36 a nd 40 samples per
pixel. High-quality supersampling is very time
consuming.
AnothersettingfortheAdaptiveHaltonand
Adaptive Uniform supersamplers is the Adaptive
toggle, which works in conjunction with the
Threshold spinner. When Adaptive is on, these
methods t ake fewer samples un less a change in
color is greater than the Threshold value. In that
case, they take the full number of samples specified
bytheQuality.Toreducetheamountoftimethe
supersampler spends, leave the Adaptive check
box on.
Interfa ce
Use G l oba l Set t in gs—When on, the material
uses the supersampling options set in the
DefaultScanlineRendererrollout(page3–37) .
Default=on.
Enable Local Supersampling—When on, applies
supersampling to the material. Default=off
Sampler drop-down list—Lets you choose which
supersampling method to apply. The list is not
active unless Use Global Settings is turned off.
Default=Max 2.5 Star.
Super sampl e Ma ps—When on, the maps applied
to the material are supersampled as well. When
off, the supersampler u ses pixel ave rages for maps.
This switch is active only when Use Global Settings
is turned off. Default=on.
Quality—Adjusts the quality of supersampling by
controlling the number of samples used for each
pixel. At the minimum value, 0.0, four samples are
taken per pixel. At the maximum value, 1.0, about
40 samples are taken per pixel (the value varies
depending o n which shader is active). Range=0.0
to 1.0. Default=0.5.
This spinner is unavailable for the Max 2.5 Star
method.
Adaptive—VisibleonlyfortheAdaptiveHalton
and Adapt ive Uniform methods. When on, these
methods take fewer samples than the Quality
specifies unless samples show a change in color
greater than the Threshold value. In that case,
they take all the samples specified by the Qualit y.