Attaching A Camera To An Object

Question

I'm currently putting together a demonstration of a
user-controlled ball rolling around on a piece of land and I'd
really like the camera to follow the ball from a distance (i.e.
have the camera move along the same axis as the ball is from it's
position in the sky) but am having some trouble doing this. What
terminology or syntax should I use for this, and whereabouts in my
code should it fit?
My code is as follows:
quote:
global w, hk, rb, vPlaneH, rb2
on beginSprite me
createPhysicalObjects()
end
on createPhysicalObjects me
-- ball
m = w.model("Marble")
m.addModifier(#meshdeform)
rb = hk.makeMovableRigidBody(m.name, 100)
rb.restitution = 2
rb.friction = 500
-- ground
m = w.model("Landscape")
m.addModifier(#meshdeform)
rb2 = hk.makeFixedRigidBody(m.name, false)
-- invisible bottom
vPlaneMR = w.newModelResource("ground", #box)
vPlaneMR.height = 10
vPlaneMR.width = 225
vPlaneMR.length = 225
vPFixed = w.newModel("bottom", vPlaneMR)
vPFixed.transform.position = vector (0, 0, -20)
vPFixed.transform.rotation = vector (90, 0, 0)
--vPFixed.visibility = #none
vPFixed.addModifier (#meshDeform)
--vPFixed.visibility = #none
vPFixedH = hk.makeFixedRigidBody ("bottom", true, #box)
hk.gravity = vector (0, 0, -100)
end
on exitFrame me
-- x axis (RED) point left, y axis (GREEN) points towards
the camera and z axis (BLUE) points up
-- Marble Movement
if keyPressed (126) then rb.applyImpulse (vector (-300, 0, 0
else if keyPressed (125) then rb.applyImpulse (vector (300,
0, 0))
else if keyPressed (123) then rb.applyImpulse (vector (0,
300, 0))
else if keyPressed (124) then rb.applyImpulse (vector (0,
-300, 0))
end if
I've managed to transform the camera now into a suitable
position from the Marble.
quote:
w.camera[1].transform.position = vector (-350, -350, 250)
This is the perfect starting viewpoint, though I still cannot
find the right code for attaching it.

Answer 1

I don't have director in front of me to check the syntax, but
try this:
on exitFrame me
-- x axis (RED) point left, y axis (GREEN) points towards the
camera and z axis (BLUE) points up
-- Marble Movement
if keyPressed (126) then rb.applyImpulse (vector (-300, 0, 0
else if keyPressed (125) then rb.applyImpulse (vector (300,
0, 0))
else if keyPressed (123) then rb.applyImpulse (vector (0,
300, 0))
else if keyPressed (124) then rb.applyImpulse (vector (0,
-300, 0))
end if
--Make camera follow ball (although rotation never changes
this way)
ballTransform = m.getWorldTransform()
w.camera[1].transform.position = ballTransform.position
w.camera[1].translate(-350,-350,250,#self)
lookAtPosition = ballTransform.position
w.camera[1].pointAt(lookAtPosition)
end
It should give you a good a start at least....