Re: Linking Camera to Fractal Noise by Darby Edelen on Aug 25, 2008 at 6:29:41 pm
So I posted this to the Media Motion list, but I wanted to make sure that it went up here as well. The way I usually link fractal noise with the camera is by using a 3D null as a reference point for the offset turbluence, scale and rotation of the fractal noise. Those expressions are below. "Target" is the 3D Null layer.
For Offset Turbulence: l = thisComp.layer("Target");
fromComp(l.toComp(l.anchorPoint));
For Scale: c = thisComp.activeCamera;
l = thisComp.layer("Target");
pc = c.toWorld([0,0,0]);
pl = l.toWorld(l.anchorPoint);
value * c.cameraOption.zoom / length(pl, pc);
For Rotation: l = thisComp.layer("Target");
v = l.toCompVec([1,0,0]);
radiansToDegrees(Math.atan2(v[1], v[0]));
Re: Linking Camera to Fractal Noise by Roland R. Kahlenberg on Aug 26, 2008 at 3:48:25 am
AcccccccccCCCKKK!!!
My camera's a one-point camera -no POI. I'm doing a very simple y-rotation of the camera. And no Null's too cos of the simple camera move.
I ended up using the Ease Interpolation Method and came up with this script -
-------
yRot = thisComp.activeCamera.transform.yRotation;
ease(yRot,333.8,700,[360,value[1]],[900,value[1]])
-------
But thanks for those scripts. They'll come in extremely handy for more complex camera moves - which will be coming up shortly.
FWIW, I'm using Fractal Noise to mimic a night sky - so interpolation is almost a must to ensure that the relative movement of the clouds/sky is more realistic.
Gracias!
RoRK
broadcastGEMs.com - the leader in customizable royalty-free animated backdrops
Re: Linking Camera to Fractal Noise by Darby Edelen on Aug 26, 2008 at 8:26:48 am
[Roland R. Kahlenberg]"My camera's a one-point camera -no POI. I'm doing a very simple y-rotation of the camera. And no Null's too cos of the simple camera move."
I'm not quite clear on why this doesn't allow you to use a Null? If anything using the 3D Null technique to simulate clouds on a horizon should work better with a simple pan/rotation than with translation.
I really think you'll be impressed with the results if you apply all 3 expressions to your 2D fractal noise layer and play with the camera...
Re: Linking Camera to Fractal Noise by Roland R. Kahlenberg on Aug 26, 2008 at 9:00:09 am
I've got over 100 layers in the comp. That makes me wanna go the minimalist route on other thingies. And it's a night sky, so the clouds are subtle. It looks alright with the translation. The rotation actually looks good - maybe too good. :-)
I've got loads of things happening on the floor area so the cloud/sky area is bestest if left subtle.
But I'll give your Expressos a whirl once I'm done with this and get to work with a more day-like sky BCK.
Cheers
RoRK
broadcastGEMs.com - the leader in customizable royalty-free animated backdrops
