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3D rotation with scale+opacity according to Z position
Hi,
I have made a little slideshow in which I animate photos in a circle rotating in 3d space controlled by a Null object.
I just don’t get the circle to have depth. The photos on the backside of the circle don’t get small enough and are too confusing, so I need to scale them down, add blur and transparency the farer they are in the back on the z-axis.
Can anyone help me with an expression? I wonder because since the photos are rotated by a Null Object there is no location other than the original one stored in the seperate photo layers until I take off the parenting to the Null… can you still access the rotated position to read the Z-Axis and use it to trigger a expression for the scale+opacity??
Also I went nuts to arrange the layers in 3D space on a circle. when rotating them around a center I couldn’t make them auto-orient to the camera, so I had to move them by hand to their locations… I guess there must be scripts for the purpose of arranging layers in 3D space. Any hints??
Thanks in advance,
Karim
replied 17 years, 7 months ago 2 Members · 3 Replies
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3 Replies
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You can get the world position of a layer like this:
toWorld(anchorPoint)
Are you saying that you have the child layer’s “Auto Orient Towards Camera” turned on but it’s not working?
Dan
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Hello Dan,
thanks for your reply…
I got auto orient on and its working now but I had to place all layers by hand. When I moved the anchor point and rotated each layer by x degrees the auto orient would not work. Is that right?? Does auto orient only work for layers which are not rotated??As for the expression…
toWorld(anchorPoint)
Where do I place it and how do i extract the z-position from it to use e.g. for transparency? Sorry, but I only use exressions rarely and always have to start from scratch.
Karim
-Karim-
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If you’re moving the anchor point, that will definitely mess up the auto orient, because it’s the anchor point that gets oriented towards the camera.
If you need the world z coordinate for your expression, you just do something like this:
z = toWorld(anchorPoint)[2];
Of course, again, if you’ve moved the layer’s anchor point, that will mess up the calculation.
Then you’d have to do something like this:
z = toWorld([width/2, height/2, 0])[2];
Dan
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