Nuke camera export scale issue

[chazfest]

Hi,
I'm hoping someone can help me here...
So I've been using Nuke's inbuilt CameraTracker a lot recently and love how quickly I can achieve a solid track on the majority of footage. However, getting that tracked camera (along with placement geometry) into a 3D app always seems to result in a miniature scene

So I'll export the scene from Nuke as an FBX file using the 'WriteGeo' node. I then import that FBX file into Cinema4D or Houdini and bring in the cam, geometry and animation. The resulting scene is really tiny. I can drop in a standard sphere and have to scale it to around 1-5% of its original size, otherwise it engulfs the entire scene. It's honestly like comparing a beachball to a golf ball (the latter being the scene).

Is this normal? Or is there a step I'm missing out, or an option I'm not selecting somewhere?

It's driving me up the wall tbh
Any advice is greatly appreciated.

Thanks in advance.

[metalrahul]

Have you tired adding real world scale distance to your track points and also increasing Scene scale in camera tracker parameters?

Sometimes even after these steps you may manually need to scale the scene in your 3D app by linking your camera and track points. For this purpose you should add some cue points(objects) in Nuke for reference to match while scaling in your 3D app.

[chazfest]

I'm not sure how/if you can add real world scale to a cam track in Nuke. Fingers crossed it is.
Thanks for the advice.

Also, I've found that if I create a Null object in Houdini, and branch the camera and geometry from that, I can scale the Null to bring the scene up to a more useable size. Perhaps a temporary fix if nothing else.

[Gentle Fury]

check that your exporting app is in cm....or else you will get a major discrepancy.

[metalrahul]

I'm not sure how/if you can add real world scale to a cam track in Nuke. Fingers crossed it is.
Thanks for the advice.

Select two green track points in your camera tracker node and right click>> add scale distance (you may need to convert meters to centimeters).

[tcastudios]

I can't help with geometry but for C4D I can offer SteadyCHAN
that takes care of your cameras in and out of C4D using
the chan format.

tcastudios -> xfiles

Cheers
Lennart