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Convert 3D null position points to 2D, with an expression?

Posted: April 28th, 2008, 9:57 am
by drscarybeard
I have a .ma file with a Maya camera and a bunch of nulls. I have imported this into After Effects.

I want to turn the 3D position points of the nulls relative to the camera into 2D position points based on the Comp window position.

Is there a way to do this with an expression?

Thanks

Re: Convert 3D null position points to 2D, with an expression?

Posted: April 28th, 2008, 10:08 am
by Dan Ebberts
I general, it would look like this:

L = thisComp.layer("Null 1");
L.toComp(L.anchorPoint)


Dan

Re: Convert 3D null position points to 2D, with an expression?

Posted: August 25th, 2008, 9:20 am
by jayse
Could anyone clarify this one? I'd love to use a 3d null from c4d that I set up as 'the sun'

Use that to drive the positional values of a 2 dimensional item such as the position of Knoll Lens Flare.

I tried putting this on a new null and targeting the 3d null (thisComp.layer("sun"));

But it errors out. Must be more to it.

~ noob

// jayse

Re: Convert 3D null position points to 2D, with an expression?

Posted: August 25th, 2008, 9:26 am
by Dan Ebberts
You would apply the expression to the effect point (assuming the effect is applied to a comp-sized 2D layer).

Dan

Re: Convert 3D null position points to 2D, with an expression?

Posted: August 25th, 2008, 12:17 pm
by jayse
That's awesome Dan - thanks so much - this will become one of my most used expressions!