Creating a hierarchy and using expressions
| Author: | Matthias Baas (mbaas@users.sourceforge.net) |
|---|---|
| Date: | 2004/12/20 |
This script creates a hierarchy of objects so that moving the parent will automatically move the children as well. The animation is created by using expressions.
Here is the script:
######################################################################
# Creating a hierarchy and using expressions
######################################################################
# Camera
TargetCamera(
pos = vec3(2,1,2.5),
target = vec3(0,0,0),
fov = 40
)
# Lights
GLTargetDistantLight( pos=(0,0,1) )
GLTargetDistantLight( pos=(0,0,-1), diffuse=(1,0.5,0.2), intensity=2 )
######################################################################
# Center sphere
######################################################################
hub = Sphere(
radius = 0.3,
pivot = (0, 0, -0.1),
material = GLMaterial( diffuse = (0.8,0.85,0.9) )
)
# Animate the center sphere (all other objects will move with it)
e = Expression("mat3().fromEulerZYX(pi*sin(0.2*t), 0, -1.4*t)")
e.output_slot.connect(hub.rot_slot)
######################################################################
# Spokes
######################################################################
# Define the materials for the cylinders and boxes...
mat1 = GLMaterial( diffuse = (1,1,1) )
mat2 = GLMaterial( diffuse = (0.7, 0.3, 0.2) )
mats = [mat1,mat2]
# Create boxes as children of the sphere alternately using mat1 and mat2
numspokes = 20
for i in range(numspokes):
a = float(i)/numspokes
# Create cylinders as children of the center sphere
c = CCylinder(name = "Spoke%d"%i,
pos = (0,0,0),
pivot = (0,0,0.5),
length = 1.0,
radius = 0.02,
material = mats[i%2],
parent = hub
)
# Animate the rotation of the cylinder
# (the z angle will "position" the cylinder at the correct angle around the hub)
e = Expression("mat3().fromEulerZYX(0, 0.3*sin(%f+2*t)+pi/2, %f)"%(4*a*pi, 2*a*pi))
e.output_slot.connect(c.rot_slot)
# Create boxes as children of the cylinder
b = Box(name = "Box%d"%i,
pos = (0,0,-0.5),
lx=0.1, ly=0.3, lz=0.1,
material = mats[i%2],
parent = c
)
# Creating a hierarchy and using expressions
######################################################################
# Camera
TargetCamera(
pos = vec3(2,1,2.5),
target = vec3(0,0,0),
fov = 40
)
# Lights
GLTargetDistantLight( pos=(0,0,1) )
GLTargetDistantLight( pos=(0,0,-1), diffuse=(1,0.5,0.2), intensity=2 )
######################################################################
# Center sphere
######################################################################
hub = Sphere(
radius = 0.3,
pivot = (0, 0, -0.1),
material = GLMaterial( diffuse = (0.8,0.85,0.9) )
)
# Animate the center sphere (all other objects will move with it)
e = Expression("mat3().fromEulerZYX(pi*sin(0.2*t), 0, -1.4*t)")
e.output_slot.connect(hub.rot_slot)
######################################################################
# Spokes
######################################################################
# Define the materials for the cylinders and boxes...
mat1 = GLMaterial( diffuse = (1,1,1) )
mat2 = GLMaterial( diffuse = (0.7, 0.3, 0.2) )
mats = [mat1,mat2]
# Create boxes as children of the sphere alternately using mat1 and mat2
numspokes = 20
for i in range(numspokes):
a = float(i)/numspokes
# Create cylinders as children of the center sphere
c = CCylinder(name = "Spoke%d"%i,
pos = (0,0,0),
pivot = (0,0,0.5),
length = 1.0,
radius = 0.02,
material = mats[i%2],
parent = hub
)
# Animate the rotation of the cylinder
# (the z angle will "position" the cylinder at the correct angle around the hub)
e = Expression("mat3().fromEulerZYX(0, 0.3*sin(%f+2*t)+pi/2, %f)"%(4*a*pi, 2*a*pi))
e.output_slot.connect(c.rot_slot)
# Create boxes as children of the cylinder
b = Box(name = "Box%d"%i,
pos = (0,0,-0.5),
lx=0.1, ly=0.3, lz=0.1,
material = mats[i%2],
parent = c
)