3D Camera To Psunami Camera (3D rotation matrix)

[Jamie Bradshaw]

Okay so I have been trying to dig further into this problem. I found this previous thread:

https://forums.creativecow.net/thread/227/8461#8465

… and from which this code looks like it might be close to what I need:

//
L = thisComp.layer(“Layer 1”);
u = L.toWorldVec([1,0,0]);
v = L.toWorldVec([0,1,0]);
w = L.toWorldVec([0,0,1]);

sinb = clamp(w[0],-1,1);
b = Math.asin(sinb);
cosb = Math.cos(b);
if (Math.abs(cosb) > .0005){
c = -Math.atan2(v[0],u[0]);
a = -Math.atan2(w[1],w[2]);
}else{
a = Math.atan2(u[1],v[1]);
c = 0;
}
[radiansToDegrees(a),radiansToDegrees(b),radiansToDegrees(c)]
//

(obviously I can then use radiansToDegrees(a) for the Psunami Tilt and radiansToDegrees(b) for Pan etc)

It certainly feels like I’m getting closer with it but still not there. I have a sneaky feeling it has something to do with a different rotation order from the AE camera and the Psunami camera.

For example, it I rotate the AE camera just on the x-axis it works fine, but as soon as I add any rotation on the y-axis it starts to break (and vice-versa).

Any help would be massively appreciated as I have been trying to solve this issue for a long time now. I’d even appreciate if someone with more knowledge on such things could suggest if they think I am on the right tracks or if they think it is even possible.

Thanks,
Jamie

JimJam•Graphics
https://www.jimjamgraphics.com/

[Tudor “ted” jelescu]

I have successfully used the tutorial below to link the Psunami camera to AE.
https://www.digitalanarchy.com/tutes/psunami_camera-link.pdf
Hope it helps.

Tudor “Ted” Jelescu
Senior VFX Artist

[Jamie Bradshaw]

Hi Ted.

I actually found your tutorial as I started to google for help after first I ran into trouble. Unfortunately though it didn’t seem to work for me. Not sure if I was doing anything wrong, but I still encountered the same camera rotation problem.

Many thanks,
Jamie

JimJam•Graphics
https://www.jimjamgraphics.com/

[Jamie Bradshaw]

Problem half solved.

After more investigation I have now found the problem and a work-around.

As I suspected, the issue is that the AE camera uses a rotation order of X>Y>Z while the Psunami camera uses Y>X>Z.

I started to try and work out what modifications I would need to make Dan Ebbert’s code work (that I previously posted) but I think it would take me too long to get my head around.

So instead I have simply created a work-around by parented rig system that effectively makes the rotation order of my AE camera the same as Psunami’s (Y>X>Z)

Here is a short test of that working:

https://reels.creativecow.net/film/psunami-camera-test

It has made my intended animation for the camera a lot more fiddly to do though so if someone out there does know a good way to convert X>Y>Z to Y>X>Z that would be fantastic. If anyone can help this then I would also be happy to contribute towards a definitive tutorial/script on this matter as I have seen quite a few people asking the same problem and I think a good solution really would make the Psunami plugin even more powerful.

Thanks,
Jamie

JimJam•Graphics
https://www.jimjamgraphics.com/

[Eden Exposito]

Hi Jamie!

Can you post all expressions to mimic after effects camera and where we must place it or a screenshot with it?

Thanks!!