Raytrace Antialiaser Dialog: Multiresolution Adaptive Antialiaser
 
 
 
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Rendering menu Raytracer Settings Render Setup dialog Raytracer panel Raytracer Global Parameters rollout Raytracer Global Parameters Global Ray Antialiaser group Turn on global antialiasing. Choose Multiresolution Adaptive Antialiaser from the drop-down list. ... button

Material Editor Material/Map Browser Raytrace material Raytracer Controls rollout Raytraced Reflection and Refraction Antialiaser group (enabled only if antialiasing is globally enabled) Choose Multiresolution Adaptive Antialiaser from the drop-down list. ... button

The Multiresolution Adaptive Antialiaser dialog changes settings for the Raytrace material and maps Multiresolution Adaptive antialiaser. You can use this dialog either globally, from the Raytracer Global Parameters rollout, or locally, from the Raytracer Controls rollout. When you locally change settings for an antialiaser, you don't affect the global settings for that antialiaser.

Interface

Adaptive Control group

Initial Rays

Sets the initial number of rays cast per pixel. Default=4.

Threshold

Determines the sensitivity of the adaptation algorithm. It can range from 0 to 1, where 0 always casts the maximum number of rays and 1 always casts only the minimum number of rays. Default=0.1.

Max. Rays (Maximum Rays)

Sets the maximum number of rays the algorithm will cast. Default=32.

Blur / Defocus (Distance Blur) group

Blur Offset is similar to blur offset for bitmaps, while Defocusing is based on distance.

Blur Offset

Affects the sharpness or blurriness of the reflections or refractions without regard to distance. You can use Blur Offset to soften or defocus the details of a reflection or refraction. The value is specified in pixels. Default=0.0.

TipThe default Blur Offset setting usually produces good results. If you see aliasing in reflections or refractions, increase its value in increments of 0.5 until the aliasing goes away.
Blur Aspect

This is an aspect ratio that changes the shape of the blur. Usually you will not need to change it. Default=1.0.

TipIf you see aliasing that occurs mostly along horizontal lines, try increasing Blur Aspect to 1.5. This changes the shape of the blurred effect. The reverse is also true. If aliasing occurs mostly along vertical lines, try decreasing Blur Aspect to 0.5.
Defocusing

Defocusing is a blur based on distance. With Defocus, objects near the surface are not blurred, but objects farther away are blurred. The rays cast are spread as they leave the Raytrace material object's surface. Default=0.0.

TipIncreasing the value of Defocusing can give a good distance blurring effect. Small adjustments are usually adequate. Try starting with a value less than 0.1, and increase or decrease it as necessary. Also try adjusting Reflect Falloff in Raytrace material or Attenuation in Raytrace map to get the best distance blurring effect.
Defocus Aspect

This is an aspect ratio that changes the shape of the defocusing. Usually you will not need to change it. Default=1.0.