Adobe Director Basics

ADOBE DIRECTOR BASICS
3D: Controlling action
on GetDistanceToPlane(aPointInSpace,aPointOnPlane,aNormalToPlane)
-- INPUT: All parameters must be vectors
-- and must be position
-- vectors
-- must not have a length of zero
-- OUTPUT: Returns the distance from aPointInSpace to the
-- closest point in the plane
---------------------------------------------------------------
vNormal = aNormalToPlane.getNormalized()
vPlaneToPoint = aPointInSpace - aPointOnPlane
vDistance = vPlaneToPoint.dotProduct(vNormal)
return vDistance
end GetDistanceToPlane
Getting the closest point in a plane
Where will the fridge magnet jump to when the user releases it? The following handler uses the
GetDistanceToPlane() to find the closest position rather than the distance:
on GetClosestPointInPlane(aPosition,aPointOnPlane,aNormalToPlane)
-- INPUT: All parameters must be vectors
-- and must be position
-- vectors
-- must not have a length of zero
-- OUTPUT: Returns the closest point in the plane to aPosition
---------------------------------------------------------------
vNormal = aNormalToPlane.getNormalized()
vDistance = GetDistanceToPlane( \
aPosition, \
aPointOnPlane, \
vNormal)
vPointInPlane = aPosition - vNormal * vDistance
return vPointInPlane
end GetClosestPointInPlane
Mapping a vector to a plane
Imagine that you have an inclined plane with a ball on it. The force of gravity acts vertically on the ball. What
proportion of that force acts parallel to the plane to make the ball roll?
Imagine that you have a pole in the ground at an arbitrary angle, and that the sun is directly overhead. What will be
the length and direction of the pole's shadow?
You can use following handler to solve both these questions:
Last updated 8/26/2011
380