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--- simulating_photosynthesis [2008-10-06 09:54] – davegriffiths
+++ simulating_photosynthesis [2008-10-06 09:57] – davegriffiths
@@ Line 1: / Line 1: @@
 ===Making plants grow towards light===
+Using lindenmayer systems and genetic algorithms to simulate plant growth.
 {{http://www.pawfal.org/dave/images/patab-angle-s.png}}
@@ Line 6: / Line 8: @@
 Plants are given a "fitness" based on their leaves -
-* How much do they face the light?
+  * How much do they face the light?
-* Are they too close to other leaves?
+  * Are they too close to other leaves?
-* Are they in shadow from another leaf?
+  * Are they in shadow from another leaf?
-* Are they below the ground?
+  * Are they below the ground?
-* Also - the fitness drops as the plant description (a linenmayer system string) gets too long.
+  * Also - the fitness drops as the plant description (a linenmayer system string) gets too long.
 Using this measurement, a genetic algorithm can create populations of individual plants, score each one and iteratively create new populations by combining fit individuals.
@@ Line 17: / Line 19: @@
 <embed src="http://blip.tv/play/AdGkH4_+Sw" type="application/x-shockwave-flash" width="640" height="480" allowscriptaccess="always" allowfullscreen="true"></embed>
 </html>
-Each frame is the fittest of a new population - the simplest strategy is to "cheat" :)
+The simplest strategy is to "cheat" :) Each frame is the fittest of a new population.
 {{http://www.pawfal.org/dave/images/patab-long.png}}
 The result of a long run with many thousands of generations.
 {{http://www.pawfal.org/dave/images/patab-helped.png}}
 You can also evolve from a starting point - in this case a simple tree is modified to create a bigger and more suitable one for the environment.
+Code: http://www.pawfal.org/flotsam/jetsam/patabotany/scheme/