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{{tag>programmation python maya fractale}} ======Arbre fractal====== Par position/rotation (polygonal) : <file python fractalTree.py> from maya.cmds import polyCube,xform from math import cos,sin def tree(x,y,z,a,b,l,w,r,s,it,lvl=0): if(lvl<it): polyCube(h=l,w=w,d=w) xform(relative=1, translation=(x,y,z), rotation=(-50*b,0,90+a*50), pivots=(0,l*.5,0) ) x2 = x + l*cos(a)*cos(b) y2 = y + l*cos(a)*sin(b) z2 = z + l*sin(a) tree(x2,y2,z2,a+s,b,l*r,w*r,r,s,it,lvl+1) tree(x2,y2,z2,a-s,b,l*r,w*r,r,s,it,lvl+1) tree(x2,y2,z2,a,b+s,l*r,w*r,r,s,it,lvl+1) tree(x2,y2,z2,a,b-s,l*r,w*r,r,s,it,lvl+1) tree(0,0,0, # position 0,0, # angle (alpha,beta) 1.0,.1, # size (length,width) .7, # size factor 1, # spreading (0<x<pi/2) 5) # iterations </file> Par position (courbes) : <file python fractalTreeCV.py> from maya.cmds import curve from math import cos,sin class FractalTree(): '''Tree in one curve (inexact but light)''' def __init__(self): self.pts = [] self.it = 7 # tree iterations self.r = .7 # branch length factor self.s = .5 # branch spreading (0<x<pi/2) self.d3 = True # 3D or 2D tree self.branch() curve(p=self.pts,d=1) def branch(self, x=0,y=0,z=0, # branch position a=0,b=0, # branch angle l=10, # branch length lvl=0 # branch iteration ): if(lvl<self.it): self.pts.append((x,y,z)) x2 = x + l*cos(a)*cos(b) y2 = y + l*cos(a)*sin(b) z2 = z + l*sin(a) self.branch(x2,y2,z2,a+self.s,b,l*self.r,lvl+1) self.branch(x2,y2,z2,a-self.s,b,l*self.r,lvl+1) if(self.d3): self.branch(x2,y2,z2,a,b+self.s,l*self.r,lvl+1) self.branch(x2,y2,z2,a,b-self.s,l*self.r,lvl+1) tree = FractalTree() </file> <file python fractalTreeMultiCV.py> from maya.cmds import curve from math import cos,sin class FractalTree(): '''Every branch is a curve (exact, 20.000+ curves in it-8)''' def __init__(self): self.it = 6 # tree iterations self.r = .7 # branch length factor self.s = .5 # branch spreading (0<x<pi/2) self.d3 = True # 3D or 2D tree self.branch() def branch(self, x=0,y=0,z=0, # branch position a=0,b=0, # branch angle l=10, # branch length lvl=0 # branch iteration ): if(lvl<self.it): x2 = x + l*cos(a)*cos(b) y2 = y + l*cos(a)*sin(b) z2 = z + l*sin(a) curve(p=[(x,y,z),(x2,y2,z2)],d=1) self.branch(x2,y2,z2,a+self.s,b,l*self.r,lvl+1) self.branch(x2,y2,z2,a-self.s,b,l*self.r,lvl+1) if(self.d3): self.branch(x2,y2,z2,a,b+self.s,l*self.r,lvl+1) self.branch(x2,y2,z2,a,b-self.s,l*self.r,lvl+1) tree = FractalTree() </file> {{gallery>:galerie?fractaltree*&500x500&nocrop&showtitle}} ~~DISCUSSION~~