9.5.2

822 • CHAPTER 18
MATERIAL EDITOR • 823
MIP and SAT mapping approximate a value using these pixels. Only an approximation is made, since
calculating the exact value would increase the render time greatly. Figure 2 shows Edge antialiasing
with 2 x 2 oversampling. The material used SAT sampling. The image quality is much improved,
including the reection on the sphere.
Figure 1: Rendered with MIP sampling. Figure 2: Rendered with SAT sampling.
The downside to MIP and SAT mapping is that they require extra memory. MIP mapping needs an
extra byte of memory per texture pixel, SAT mapping requires an extra 12 bytes per texture pixel.
Although SAT mapping produces better render quality than MIP mapping, MIP mapping uses much
less RAM and hence is the default interpolation type. As a rule of thumb, use MIP mapping initially
and switch over to SAT mapping if required. CINEMA 4D’s shaders use SAT mapping automatically
without consuming additional memory.
MIP and SAT mapping affect the render time. On the one hand, MIP and SAT mapping take slightly
longer to render. On the other hand, you may be able to reduce the antialiasing setting.
Blur Offset, Blur Scale
With oors, try a positive blur strength of about +20%. Floors tend to suffer
most from perspective distortion, so they require special treatment.
The Blur Offset can be used to soften a texture.