Model-Less Control - Real-Time Rendering: Computer Graphics with Control Engineering - page 94

Input Membership Functions

abovehigh belowhigh

1

abovehigh
belowhigh

0.8

0.6

0.4

0.2

0

−40 −30 −20 −10 0

fpserr

10 20 30 40

(a)

Output Membership Functions

increasehigh decreasehigh

increasehigh
decreasehigh

1

0.8

0.6

0.4

0.2

0

−4000 −3000 −2000 −1000 0 1000 2000 3000 4000

Vertex Count

(b)

FIGURE 6.6 Input and output membership functions.

The fps_error fuzzy variable is set at ±40 FPS from the operating point of 400
FPS while the vertex_count variable is set at ±4,000 vertices. The fuzzy control
system follows the design in Figure 6.7.
All experiments were run on a desktop computer with an Intel Core 2 Quad CPU
at 3 GHz, with 8 GB of main memory and NVIDIA GeForce GT 320 graphics
processor hardware (4 GB video memory) on a 64-bit Windows 7 operating system.
The fuzzy logic toolbox was used to generate the fuzzy inference system and fuzzy
controller design.