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Raytracing Acceleration Parameters Dialog 1531
Raytracing Acceleration
Pa r a met er s D ia l og
Rendering menu > Raytracer S ettings > Render Scene
dialog > Raytracer panel > Raytracer Global Parameters
rollout > Global Raytrace Engine Options grou p >
Acceleration Controls button
The controls in this dialog let you override the
default acceleration values and sp ecify your own
requirements. Ty pically you don’t need to use
them, but if you are fami liar with the requirements
of your scene, they can help you optimize r aytrace
rendering for your specific needs and time
constraints.
Raytracing subdivides the scene, organizing it into
a tree for raytrace pur poses. A node in this tree is
known as a "voxel." Voxel trees are dy namic, and
you can’t explicitly specify the structure of the tree.
(If you set Max. Divisions to 2, the tree is an o ctree,
which is possibly a more familiar data structure.)
Tip: If your scene is ver y unbalanced (for example,
ithasagiantplanetobjectandaclusterofsmall
spacecraft objects) keep the B a lance setting low.
Inter face
Face Limit—Sets the maximum number of faces
allowed in a lattice voxel before it is subdivided.
Default=10.
Balance—Determines the sensitivity of the
subdivision algorithm. Increasing this value uses
more memory but can increase performance.
Default=4.0.
Max. Divisions—Sets the initial lattice d imension.
For example, 4 is a 4 x 4 x 4 lattice. Default=30.
Max. Depth—Sets the maximum number of lattice
subdivisions. Default=8.
Raytrace Exclude/Include Dialog
Rendering menu > Raytrace Global Include/Exclude
Material Editor > Raytrace material > R aytracer Controls
rollout > Local Exclude button
Material Editor > Raytrace map > Raytracer Parameters
rollout > Local Exclude button
Rendering menu > Raytracer S ettings > Render Scene
dialog > R aytracer panel > Raytracer Global Parameters
rollout > Global Raytrace Engine Options group > Exclude
button
Main toolbar > Render Scene > Render Scene dialog >
Raytracer panel > Raytracer Global Parameters rollo ut >
Global R aytrace Engine Options group > Exclude button
Upper left: Bottle excluded from both mirrors
Upper right: Bottle reflected by both mirrors
Lower middle: B ottle excluded from one mirror
These dialogs let you specify which objects the
raytracer wi l l and won’t see. This is a good
optimization when you are working with complex
scenes and a ll you really need is for an object to
reflect itself or some other, simpler elements in the
scene.
The global dialog affects all Rayt race materials
and Raytrace maps in your scene. The local dialog
affects only the current material or map.