The next step is to cause the panda to actually
move back and forth. Add the following lines of code:
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import direct.directbase.DirectStart
from pandac.PandaModules import *
from direct.task import Task
from direct.actor import Actor
from direct.interval.IntervalGlobal import *
import math
#Load the first environment model
environ = loader.loadModel("models/environment")
environ.reparentTo(render)
environ.setScale(0.25,0.25,0.25)
environ.setPos(-8,42,0)
#Task to move the camera
def SpinCameraTask(task):
angledegrees = task.time * 6.0
angleradians = angledegrees * (math.pi / 180.0)
base.camera.setPos(20*math.sin(angleradians),-20.0*math.cos(angleradians),3)
base.camera.setHpr(angledegrees, 0, 0)
return Task.cont
taskMgr.add(SpinCameraTask, "SpinCameraTask")
#Load the panda actor, and loop its animation
pandaActor = Actor.Actor("models/panda-model",{"walk":"models/panda-walk4"})
pandaActor.setScale(0.005,0.005,0.005)
pandaActor.reparentTo(render)
pandaActor.loop("walk")
#Create the four lerp intervals needed to walk back and forth
pandaPosInterval1= pandaActor.posInterval(13,Point3(0,-10,0), startPos=Point3(0,10,0))
pandaPosInterval2= pandaActor.posInterval(13,Point3(0,10,0), startPos=Point3(0,-10,0))
pandaHprInterval1= pandaActor.hprInterval(3,Point3(180,0,0), startHpr=Point3(0,0,0))
pandaHprInterval2= pandaActor.hprInterval(3,Point3(0,0,0), startHpr=Point3(180,0,0))
#Create and play the sequence that coordinates the intervals
pandaPace = Sequence(pandaPosInterval1, pandaHprInterval1,
pandaPosInterval2, pandaHprInterval2, name = "pandaPace")
pandaPace.loop()
run()
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Intervals are tasks that change a property
from one value to another over a specified period of time. Starting
an interval effectively starts a background process that modifies the
property over the specified period of time. For example, consider the
pandaPosInterval1 above. When that interval is
started, it will gradually adjust the position of the panda from
(0,10,0) to (0,-10,0) over a period of 13 seconds. Similarly,
when the pandaHprInterval1 is started,
the orientation of the panda will rotate 180 degrees over a period of 3 seconds.
Sequences are tasks that execute one interval
after another. The pandaPace sequence above
causes the panda to move in a straight line, then turn, then in the
opposite straight line, then to turn again. The code pandaPace.loop() causes the Sequence to be started
in looping mode.
The result of all this is to cause the panda to pace
back and forth from one tree to the other.
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