def update(self, params):
self.set_background_color(params["Background Color"])
self.path1 = pyribbed.Polyline()
self.path2 = pyribbed.Polyline()
twists = params["Twists"]
offset = params["Twist Offset"]
baseRadius = params["Base Radius"]
apexRadius = params["Apex Radius"]
segments = 1000
for i in xrange(segments + 1):
t = float(i) / segments
radius = (self.ellipse_pos(1, apexRadius - baseRadius, t)[1] +
baseRadius)
angle = 2 * pi * t * twists + offset
pos = self.ellipse_pos(params["Width"], params["Height"], t)
dir = self.ellipse_norm(params["Width"], params["Height"], t)
p1 = cos(angle) * dir + Vector(0, 0, sin(angle))
p2 = cos(angle + pi) * dir + Vector(0, 0, sin(angle + pi))
p1 *= radius
p2 *= radius
p1 += pos
p2 += pos
self.path1.push_back(p1)
self.path2.push_back(p2)
# Sweep radii
ribRad = params["Rib Radius"]
self.ribCross = self.circle(Vector(0, 0, 0), Vector(ribRad, 0, 0),
Vector(0, ribRad, 0), 0.0, 2.0 * math.pi,
8)
railRad = params["Rail Radius"]
self.railCross = self.circle(Vector(0, 0, 0), Vector(railRad, 0, 0),
Vector(0, railRad, 0), 0.0, 2.0 * math.pi,
8)
self.rail1 = sweep(self.railCross, self.path1)
self.rail2 = sweep(self.railCross, self.path2)
bend = params["Rib Bend"]
def ribParams(end0, frenet0, end1, frenet1, t):
mag = 2.0 * t - 1.0
return (end0 + mag * bend * (frenet0.binormal),
end1 + mag * bend * (frenet1.binormal))
numRibs = params["Num. Ribs"]
self.ribsRails = pyribbed.hermite_ribbed_surface(
self.path1, (0.02, 0.98), self.path2, (0.02, 0.98), ribParams,
numRibs, self.ribCross)
for rib in self.ribsRails:
self.instance(rib)
self.instance(self.rail1)
self.instance(self.rail2)
self.light(Vector(50, 50, 50), Vector(1, 1, 1), 1)
self.light(Vector(-50, -50, -50), Vector(0.4, 0.1, 1), 0.1)
def circle(self, center, xVec, yVec, startAngle, endAngle, samples):
sc = pyribbed.Polyline()
for i in xrange(samples):
t = float(i) / float(samples - 1)
angle = t * (endAngle - startAngle) + startAngle
sample = math.cos(angle) * xVec + math.sin(angle) * yVec
sc.push_back(center + sample)
return sc