Practical Algorithms for 3D Computer Graphics, 2nd Edition

11.2. CPU textures 483

Figure 11.23: Variably sized rand o m colored dots.

Figure 11.24: Random colored crysta ls . (Basically a random dot texture but with a

dot radius tha t exceeds the s iz e of the unit cell.)

11.2.20 Crystals

By allowing the dot radius to incr eas e until adjacent dots overlap and then

bringing into effect a Z buffer as used in section 11.2.7 the d ots will appear to

lock together into a matrix of colored crystals. Figure 11.24 illustrates a basic

one sphere per unit cell texture after crystallization with the color of each dot

chosen at random.

11.2.21 Blisters

Blisters are another example of the extension of the random dots texture. ...