Adobe Director Basics

ADOBE DIRECTOR BASICS
3D: Controlling action
In SlideAlongWall.dir, the camera turns to face along a barrier after coming close to it
Below you will find a handler similar to the one in the SlideAlongWall.dir movie. It accepts three parameters:
aNode: a pointer to a node that may collide with a barrier
aDirection: a vector pointing in the direction that aNode is attempting to travel
aNormal: a vector pointing out from the barrier at right-angles to the point of collision
The handler will turn aNode by 2 degrees, or until it is no longer facing towards the barrier. This handler is called once
per frame, so the node will turn automatically until it is facing along the barrier. The node can then continue to travel
parallel to the barrier.
Note: If the node were touching the barrier but facing at exactly 90° to the normal, then it may remain stuck. By using a
value just over 90.0°, you can be sure that the node will be able to move after it has completed its turn.
on TurnAlongBarrier(aNode, aDirection, aNormal)
vAngle = aDirection.angleBetween(-aNormal)
if not vAngle then
-- Let the user choose which way to turn
exit
end if
vPosition = aNode.worldPosition
vAxis = aDirection.cross(aNormal)
vAngle = min(2, (90.001 - vAngle))
aNode.rotate(vPosition, vAxis, vAngle, #world)
end TurnAlongBarrier
Note: If the user is controlling the rotation of the camera or avatar, then you will want to avoid applying an automatic
rotation. The Steer and Slide Camera With Mouse behavior detects when the user is explicitly turning, and does not call
the TurnAlongBarrier() handler when this occurs.
Hugging Terrain
In your 3D world the ground may not be flat. As the camera or avatar moves around, you will want it to remain at the
same position with respect to the terrain beneath it.
Last updated 8/26/2011
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