physical camera

[shadevfx]

Is there any way to reproduce the nice, natural light falloff you get with the physical cam, without the physical cam?

I'm working with scenes that are tracked to live action footage and of course when you turn physical cam on, it no longer tracks correctly.

Is there any workaround for this?

B

[joconnell]

Ah - that'd probably be a motion blur setting. For some daft reason the vray cam is set to render in between frames rather than on the frames so you're getting the position of tracked objects at frame 0.5, 1.5, 2.5 instead of 0,1,2,3 which your track is locked to. In your render settings wherever motion blur is you should find a setting called interval center which is set to 0.5 by default. This is similar to most film camera but for tracked stuff you need it to be at 0 so that the render centers itself around the frame rather than halfway between them. You might find that you get weird motion blur on frame 0 with this if your background footage has a moving camera at the start of the shot and this is because vray needs movement from one frame to the next to calculate motion blur so if you're rendering frame 0, if it hasn't moved before then it doesn't have anything to figure out the motion blur with. Ideally you'd put a keyframe on frame -1 to give it something to work with. I normally do this by using the in / out curves on my camera moves so that the animation curve continues on in the direction it last travelled.

[shadevfx]

yes that makes sense. thanks for the tip. But really the issue is that the focal length seems unconnected to the maya camera... I hooked them up with the connection editor and it still seemed all out of wack.. not just slightly, severely.

Obviously I must be missing a step or something somewhere along the way.

[griml0ck]

No, I have had the same problem. Would be nice to be able to use the Vray cam but still have mayas FOV so you can use your tracked camera. Maybe best solution would be an option that says "use maya fov" and you just click on it. Would solve a lot of problems!

[vlado]

You can use the "Specify FOV" option for the physical camera and then put whatever value you need.

Best regards,
Vlado

[shadevfx]

I second Grimlock's request.. theres often an animated FOV, and yeah you can hook it up with an expression, but a button would be nice. As vRay starts getting more and more use in features this is going to come up.

B