CHAPTER 6

PLANTS

 

As described in Chapter 1, IFS and hopalong procedures can be used to model simple plants (Figure 2 and Figure 3). The fractal fern is a famous object modeled with IFS and hopalong technique, and there is a good reason for that. There are few other plants that can also show the same self similarity as the fern. Some simple trees can also be generated, but it is for example not possible to create leaves or berries on the tree. The transition probability technique can be used to create leaves and berries. This method works almost like an IFS, but every object can be transformed into a few different sets of objects. Each set has a transition probability. The following table will show how it is set up.

This technique is interesting and can create nice models. This technique will not be explained further as the L-systems, that are described in the next chapter, are a lot more powerful tool.

OBJECT TRANSITION PROBABILITY
Stem Continue stem
Create branch right
Create branch left
0.6
0.2
0.2
Branch Continue straight ahead
Create branch left
Create branch right
Create berry
Terminate branch
0.4
0.2
0.2
0.1
0.1

Table 2: Transition probability.

 

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