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Context-sensitive L-systems can also be used to simulate phenomena other than endogenously propagating signals. For example, Figure 21 shows a simple model of a plant attacked by an insect. The insect feeds on the apical buds; a branch that no longer carries any buds wilts. The insect is assumed to move only along the branches, thus its motions can be captured using context-sensitive L-systems. In the example under consideration, the insect systematically visits all buds, using the depth- rst strategy for traversing a tree structure.
Pruning is only one of a range of phenomena that can be modeled using environmentallysensitive L-systems. A di erent example is given in Figure 26. In this case, a climbing plant detects the presence of a supporting pole and winds around it. In contrast to the earlier models of plants growing around obstacles 2, 21, 22 , the L-system model captures the nutation, or the spiralling movement of the free stem tip searching" for support. Once a collision with the pole has been detected, a signal is sent basipetally down the stem, freezing further motions of the stem below the contact point.
A parameter value of x = 0 returned to the plant indicates that the development of the corresponding branch will be terminated. A value of x = 1 allows for further branching. The model of the environment. The environmental process considers each apex or non-terminal node of the developing tier as the center of a circular leaf cluster, and maintains a list of all clusters present. New clusters are added in response to messages received from the plant. All clusters have the same radius , specified in the environmental data file (cf.