def render_tree(n=10, r=False):
glLineWidth(2.)
glColor4f(.5, .5, .5, .5)
glBegin(GL_LINES)
_tree_branch(n - 1, euclid.Line3(euclid.Point3(0., 0., 0.),
euclid.Vector3(0., 1., 0.), 1.), r)
glEnd()
def _tree_branch(n, l, r):
glVertex3f(l.p1.x, l.p1.y, l.p1.z)
glVertex3f(l.p2.x, l.p2.y, l.p2.z)
if n == 0:
return
if r:
if random.random() > .9: return
mag = abs(l.v) * (.5 + .5 * random.random())
else:
mag = abs(l.v) * .75
if n % 2:
v1 = _ROT_30_X * l.v
v2 = _ROT_N30_X * l.v
else:
v1 = _ROT_30_Z * l.v
v2 = _ROT_N30_Z * l.v
_tree_branch(n - 1, euclid.Line3(l.p2, v1, mag), r)
_tree_branch(n - 1, euclid.Line3(l.p2, v2, mag), r)