Autodesk AUTOCAD 2006, Справочник по командам, Страница: 1043 / 1490

Contrast Threshold
Sets the sensitivity of adaptive sampling. With a low threshold, small
differences between the initial sample values force more samples to be taken.
At a higher threshold, the sample value differences must be greater to force
more sampling. This increases rendering speed at the expense of image
quality. You can specify a value between 0.0 and 1.0.
Cutoff Threshold
Defines a threshold for how much a further ray trace must contribute to
the final pixel value to continue. For example, a value of 0.03 means that
the next bounce must contribute at least 3 percent to the final pixel or the
ray tree will be pruned at this point. Values between 0.0 and 1.0 are valid.
With this feature, you can refine the trade-off between speed and image
quality.
Discard Back Faces
Prevents the program from reading the back faces of a 3D solid object when
performing calculations for a rendering (for hidden faces only). This setting
does not eliminate back faces; it only makes them invisible and speeds up
the rendering process.
Enable
Turns on adaptive sampling.
High
Renders with analytical horizontal anti-aliasing and 16 multiple shading
samples per pixel. The more samples per pixel, the more time it takes to
render the image.
Linear Sample
Averages the four pixels nearest to the sample point within the bitmap.
Low
Renders with analytical horizontal anti-aliasing and four multiple shading
samples per pixel. The more samples per pixel, the more time it takes to
render the image.
Maximum Bias
Sets the highest value in the range. The default is 4.0. This value should be
no more than 10.0 greater than the minimum bias value.
Photo Raytrace Render Options Dialog Box | 1019