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BCC rotate round null problem

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sean bowering
BCC rotate round null problem
on Nov 10, 2010 at 6:35:28 pm

hi, i'm trying to get a BCC 3d extruded object to rotate round a null. (like a planet revolving round the sun)... i linked the BCC Y rotation with the null Y rotation but it just rotates on the spot, not travelling round the null. is it something to do with anchor points? i'm baffled...

can anyone help me get this to work?



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peter mcauley
Re: BCC rotate round null problem
on Nov 10, 2010 at 8:14:39 pm

Hi,

A simple approach to the problem is do it this way:

• create a 3D null object and animate the position of the null so that it rotates around the object that you want as the center (the sun in your example)

• create a new 3D solid layer and apply the BCC 3D Object filter to that layer

• parent the 3D layer to the animated null

This leaves the problem of how to set the face of the 3D Object (the planet) so that it turns away from the camera as it orbits the center (the sun). Here's how to do this:

• add an expression to the Orientation Y parameter of the 3D Object

• pickwhip the Orientation Y parameter of the 3D Object to the Y Rotation parameter of the Null

• animate the Null object so that it makes one turn in negative values over the duration of the effect (from 0 to -1)

And that's about it. If you need any more help with this or would like me to send you an AE project that demonstrates this for you just drop me a line at peterm@borisfx.com

Cheers,

Peter.



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