def __init__(self, start=(0,0,0), end=(0,0,-1), np=2):
if np < 2:
raise AttributeError("The minimum value of np is 2 (one segment)")
start = vector(start)
end = vector(end)
vline = (end-start)/(np-1)
self.pos = []
for i in range(np):
self.pos.append(start + i*vline)
self.up = (0,1,0)
def convert(pos=(0,0,0), up=(0,1,0), points=None, closed=True):
pos = vector(pos)
up = norm(vector(up))
up0 = vector(0,1,0)
angle = acos(up.dot(up0))
reorient = (angle > 0.0)
axis = up0.cross(up)
pts = []
for pt in points:
newpt = vector(pt[0],0,-pt[1])
if reorient: newpt = newpt.rotate(angle=angle, axis=axis)
pts.append(pos+newpt)
if closed and (pts[-1] != pts[0]): pts.append(pts[0])
return pts
def _set_lights(self, n_lights):
old_lights = self._get_lights()
for lt in old_lights:
lt.visible = False
if (type(n_lights) is not list) and (type(n_lights) is not tuple):
n_lights = [n_lights] # handles case of scene.lights = single light
for lt in n_lights:
if isinstance( lt, cvisual.light ): #< TODO: should this be allowed?
lt.display = self
lt.visible = True
else:
lum = cvisual.vector(lt).mag
distant_light( direction=cvisual.vector(lt).norm(),
color=(lum,lum,lum),
display=self )
