def startOfStep():
t = balls2d.nextIteration() * balls2d.timestep()
t0 = 2.0
t1 = 4.0
if t < t0:
y_offset = 0.0
vy = 0.0
else:
y_offset = -0.1 * math.sin(4.0 * math.pi * (t - t0))
vy = -0.4 * math.pi * math.cos(4.0 * math.pi * (t - t0))
if t < t1:
x_offset = 0.0
vx = 0.0
else:
x_offset = -0.1 * math.sin(3.0 * math.pi * (t - t1))
vx = -0.3 * math.pi * math.cos(3.0 * math.pi * (t - t1))
assert balls2d.numStaticPlanes() == 4
balls2d.setStaticPlanePosition(0, x_offset, -1.0 + y_offset)
balls2d.setStaticPlanePosition(1, x_offset, 1.0 + y_offset)
balls2d.setStaticPlanePosition(2, -1.0 + x_offset, y_offset)
balls2d.setStaticPlanePosition(3, 1.0 + x_offset, y_offset)
balls2d.setStaticPlaneVelocity(0, vx, vy)
balls2d.setStaticPlaneVelocity(1, vx, vy)
balls2d.setStaticPlaneVelocity(2, vx, vy)
balls2d.setStaticPlaneVelocity(3, vx, vy)
def startOfStep():
t = balls2d.nextIteration() * balls2d.timestep()
t0 = 2.0
t1 = 4.0
if t < t0:
y_offset = 0.0
vy = 0.0
else:
y_offset = - 0.1 * math.sin( 4.0 * math.pi * ( t - t0 ) )
vy = - 0.4 * math.pi * math.cos( 4.0 * math.pi * ( t - t0 ) )
if t < t1:
x_offset = 0.0
vx = 0.0
else:
x_offset = - 0.1 * math.sin( 3.0 * math.pi * ( t - t1 ) )
vx = - 0.3 * math.pi * math.cos( 3.0 * math.pi * ( t - t1 ) )
assert balls2d.numStaticPlanes() == 4
balls2d.setStaticPlanePosition( 0, x_offset, -1.0 + y_offset )
balls2d.setStaticPlanePosition( 1, x_offset, 1.0 + y_offset )
balls2d.setStaticPlanePosition( 2, -1.0 + x_offset, y_offset )
balls2d.setStaticPlanePosition( 3, 1.0 + x_offset, y_offset )
balls2d.setStaticPlaneVelocity( 0, vx, vy )
balls2d.setStaticPlaneVelocity( 1, vx, vy )
balls2d.setStaticPlaneVelocity( 2, vx, vy )
balls2d.setStaticPlaneVelocity( 3, vx, vy )
def startOfStep():
start_of_step_time = balls2d.nextIteration() * balls2d.timestep()
if start_of_step_time >= 2 and balls2d.numStaticPlanes() == 4:
balls2d.deleteStaticPlane(2)