8

Radiosity Processing Parameters Rollout 65
Large image with no iterations has areas of uneven
illumination.
Inset images: After a number of iterations, the uneven areas
have been corrected.
Ref ine I ter ations (Selected Obj ects)—Sets the
number of Refine iterations to perform for selected
objects, u sing the same method as Refine Iterations
(All Objects). Make an object selection and then
set the number of iterations you require. Refining
selected objec ts rather than the entire scene can
save a lot of processing time. Typically, this option
is useful for objects that have a lot of small surfaces
and show a lot of variance, such as railings or
chairs or highly subdivided walls.
Note: After 3 ds Max processes Refine Iterations,
Initial Quality is d isabled and you can’t change it
until you click Reset or Reset Al l.
Process R efine I terations Stored in Obj ects—Each
objecthasaradiositypropertycalledRefine
Iterations. Each time you refine an object selection,
the number of steps stored with these objects is
incremented.
When you reset the radiosity solution and then
startitagain,thestepsforeachobjectsarerefined
automatically, provided this toggle is turned on.
This is useful w hen you are creating animations,
when the radiosity needs to be processed at every
frame, and the same level of qualit y between
frames has to b e maintained.
Update Da ta W hen R equir ed on St art—When
on,theradiosityenginemustberesetandthen
recalculated if the solution is invalidated. In this
case, the St art menu changes to read Update &
Start. When this is pressed, the radiosity solution
is reset and the calculation starts over again.
When th is toggle is off, the radiosity solution does
not need to be reset if it is invalidated. You can
continue processing your scene with the invalid
solution.
Note: The radiosity solution is invalidated any time
an object or light is added, removed, moved, or
altered in any way.
Interactive Tools group
The options in this group help you adjust the
displayoftheradiositysolutionintheviewport
and in the rendered output. These controls
take effect immediately on an existing r adiosity
solution and do not require any additional
processing for you to see their effects.
Indirect Light Filtering—Reduces the amount
of noise between surface elements by averaging
the indirect lighting levels with the surrounding
elements. A value of 3 or 4 is usually sufficient.
If you use too hig h a va lue, you risk losing detail
in the scene. Because Indirect Light Filtering is
interactive, you can readily evaluate the result and
adjust it as y ou need.
Direct Light Filtering—Reduces the amount
of noise between surface elements by averaging
the direct lighting levels with the surrounding
elements. A value of 3 or 4 is usually sufficient. If
you use too high a value, you r isk losing detail in
the scene. Direct Light Filtering is interactive, so
you can readily evaluate the result and adjust it as
you need.