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1508 Chapter 16: Material Editor, Materials, and Maps
AflatmirrorsurfacethathasaBumpmapwill
appear bumpy, but its reflection won’t be distorted
by the bumps un less you use this option.
Use B uilt-In Noise—Distor ts the reflection using the
settings in the Noise group.
Distor ti on Amount—Adjusts the amount of
distortion to the reflected image. This is the
only value that affects the amount of distortion.
No m atter how h igh the Bump map’s A mount
spinner is set, or how extreme the Noise settings,
if this Distortion Amount is set to 0, no distortion
appears in the reflection itself. This control is
inactive when None is chosen.
Noise group
Thecontrolsinthisgroupareinactiveunlessyou
chooseUseBuilt-InNoiseastheactivedistortion
type.
Regular—Generates plain noise. Basically the
same as Fractal noise with the Levels setti ng at 1.
When the noise type is set to Regular, the Levels
spinner is inactive (because Regular is not a frac ta l
function).
Fr act al—Generates noise using a fractal algorithm.
The Levels setting determines the number of
iterations f or the fractal noise.
Tu rbu lence—Generates fractal noise with an
absolute value function applied to it to make fault
lines.
Phase—Controls the speed of the animation of the
noise function. A 3D noise function is used for the
noise, so that the first two parameters are U and V
andthethirdisphase.
You can animate this parameter to animate the
noise effect.
Size—Sets the sca le of the noise function. Smaller
values give smaller chunks of noise.
Level s —Sets the number of fr actal iterations or
turbulence (as a continuous func tion).
Raytrace Map
Material Editor > Maps rollout > Click a Map button. >
Material/Map Browser > Raytrace
Raytrace map creates highly reflective and refractive
surfaces.
Rayt race map provides fully raytraced reflections
and refractions. The reflections and refractions it
generates are more accurate than those produced
by the reflect/refract
map (p age 2–1509) .
Rendering raytrace d objects is slower than using
Reflect/Refract. On the other hand, Raytrace is
optimized for rendering 3ds Max scenes, and you
canfurtheroptimizeitforyourscenebyexcluding
specific objects or effects from ray tr acing.
Yo u c a n a l s o u s e t h e
Raytrace material (page
2–1353)
,whichusesthesameraytracertogenerate
accurate, raytraced reflections and refractions.
The differences b etween Raytr ace map and
Ray t race material are:
• YouuseRaytracemapasyoudoothermaps.
This means you can add raytraced reflections
or refractions to any kind of material.
• YoucanassignRaytracemaptomaterial
components other than reflect or refract,