Adobe Director Basics

ADOBE DIRECTOR BASICS
3D: Controlling action
Applying one transform to another
As illustrated in the “Parent and child relationships with no nodes” on page 374 section above, the * (multiply)
operator can generate a new transform by applying one transform to another. If you prefer to modify one of the
original transforms you can use one of the following methods:
transform.multiply()
transform.preMultiply()
To test this in the Message window, create a transform t that represents a translation and a transform r that represents
a rotation:
t = transform()
t.translate(13, 17, 19)
r = transform()
r.rotate(90, 0, 0)
Generate a transform that represents a rotation followed by a translation, without changing the original transforms.
Note that the y and the z axes change as the initial rotation occurs around the vector(0, 0, 0) and then the
translation t is applied.
put showTransform(t*r)
-- "
1.00000 0.00000 0.00000 0.00000
0.00000 -0.00000 1.00000 0.00000
0.00000 -1.00000 -0.00000 0.00000
13.00000 17.00000 19.00000 1.00000
"
Create a duplicate of the rotation transform, and apply the translation to it using multiply(). This will modify the
duplicate rotation transform.
r2 = r.duplicate()
r2.multiply(t)
put showTransform(r2)
-- "
1.00000 0.00000 0.00000 0.00000
0.00000 -0.00000 1.00000 0.00000
0.00000 -1.00000 -0.00000 0.00000
13.00000 17.00000 19.00000 1.00000
"
Generate a transform that represents a translation followed by a rotation, without modifying the original transforms.
put showTransform(r*t)
-- "
1.00000 0.00000 0.00000 0.00000
0.00000 -0.00000 1.00000 0.00000
0.00000 -1.00000 -0.00000 0.00000
13.00000 -19.0000017.00000 1.00000
"
Use r.preMultiply() to apply the translation first, followed by the rotation, modifying the r transform in the
process.
Last updated 8/26/2011
377