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Camera Tracker and Shadows

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Sean Morton
Camera Tracker and Shadows
on Oct 21, 2011 at 6:35:09 pm

Hi everyone.

I need some lighting help. I have taken some green screen
footage and used camera tracker and keylight to give me a
moving actor. I initially recorded the actor with the cameraman
moving from left to right. I then used camera tracker and
placed the footage using camera tracker into a 3d space.

My problem is that when I added a light source I wasn't able
to get a shadow from the actor onto the back wall of the 3d space.

I have enabled shadows onto the 3d wall I created. Does Camera
Tracker allow for shadows on its footage? What am i doing wrong?
I am trying to do a more realistic composite. Using drop shadow
doesn't work since it only drops shadow on one angle and I am
panning around the actor.

Sean


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Michael Szalapski
Re: Camera Tracker and Shadows
on Oct 21, 2011 at 7:01:57 pm

Camera tracker only creates tracking data, it doesn't have anything to do with the video output.

Try precomposing your keyed actor. I'm guessing whatever method you used to pull the key isn't giving you the alpha you're expecting.

- The Great Szalam
(The 'Great' stands for 'Not So Great, in fact, Extremely Humble')

No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.


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Sean Morton
Re: Camera Tracker and Shadows
on Oct 21, 2011 at 7:33:15 pm

Hi Michael

I recorded Actor with tracking markers on the Green screen. I then
used Camera Tracker to Track footage and create tracking data and
create a camera. I then used keylight and an mask to create the alpha.
I have the actor in front of the 3d Space using camera tracker camera with no problems.
I did use a Drop Shadow on the actor which worked but I would like to create the shadow
with a spot light source.

Does that work flow sound correct?


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Michael Szalapski
Re: Camera Tracker and Shadows
on Oct 21, 2011 at 7:55:54 pm

Do you have your light set to cast shadows?
Do you have your actor layer set to cast shadows?
Do you have your other layers set to receive shadows?

If you answered "yes" to all of the above questions, I'd try precomping your actor and doing the keying in a precomp. See if that fixes your issue of it not casting shadows. (Make the precomp 3d in your main comp and leave everything in the precomp where you're doing your keying 2d.)

- The Great Szalam
(The 'Great' stands for 'Not So Great, in fact, Extremely Humble')

No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.


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Sean Morton
Re: Camera Tracker and Shadows
on Oct 21, 2011 at 8:03:54 pm

Yes is my answer to all of those questions.
I will try your suggestion. Could you explain
why you think that might do the trick??

Sean


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Michael Szalapski
Re: Camera Tracker and Shadows
on Oct 21, 2011 at 8:18:55 pm

It was a stab in the dark, but I just did a test and I don't think it'll help.
Try this: Make a small solid layer and put it in the same area as your keyed layer in 3d space. See if it casts shadows. If not, you've got a setting messed up somewhere.
OR
Do you have any 2d layers (adjustment layers, etc.) mixed in there? That'll throw off shadow casting too.

- The Great Szalam
(The 'Great' stands for 'Not So Great, in fact, Extremely Humble')

No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.


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