Linking Camera to Fractal Noise

[Dan Ebberts]

Roland,

Here’s one for Offset Turbulance that’s based on the camera’s POI:

C = thisComp.activeCamera;
z=C.pointOfInterest[2]-C.position[2];
y=C.pointOfInterest[1];
x=C.pointOfInterest[0];
xAngle=radiansToDegrees(Math.atan(y/z));
yAngle=radiansToDegrees(Math.atan(x/z));
[thisComp.width/2 – yAngle*12, thisComp.height/2 + xAngle*12]

Dan

[Roland R. kahlenberg]

Thanks Dan! I’ll give the Expression a nice gentle stir as soon as I can.

Gracias!
RoRK

broadcastGEMs.com – the leader in customizable royalty-free animated backdrops

[Darby Edelen]

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]));


Darby Edelen

NVIDIA
Santa Clara, CA

[Roland R. kahlenberg]

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

[Darby Edelen]

[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…

Darby Edelen

NVIDIA
Santa Clara, CA

[Roland R. kahlenberg]

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

[Darby Edelen]

Good deal, you know what you’re after 🙂

Darby Edelen

NVIDIA
Santa Clara, CA