Shadow help

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Old 09 September 2012   #1
Shadow help

I need some help with incorporating 3D objects and live action footage.
So I add a 3D object into my scene, add a plane, put my video material on the plane, set to 'frontal' mode, and add a composite tag with the 'composite background' button checked. Now here's my problem: If there is a shadow in my footage, and my 3D object's shadow crosses it, the 3D shadow looks like it's obviously overlaying the real shadow. Like, the fake shadow is darker than the real shadow.
Is there anyway to make a 3D shadow match the darkness of the real shadow when they overlap?
 
Old 09 September 2012   #2
To see what I mean, look here: http://i.imgur.com/H2JUF.png
 
Old 09 September 2012   #3
You can adjust the color and density of the 3D shadow to match the real one. Check the Shadow tab of the Light attributes.
 
Old 09 September 2012   #4
Yeah, but then the density of the shadow wouldn't match the other shadows. (The part of the shadow that's not overlapping would be barely visible)
 
Old 09 September 2012   #5
Try turning the density up to 100% and above { so its just solid color, no opacity change } Sample the colour, then work out how to mask out the tile grooves.

Depending how many frames you have you could try PS, use the line tool and say 50% grey etc in the mask. If you have more camera movement then AE and stroking paths is probably the order of the day.

When you have the colour and mask sorted, then add some coloured noise in AE to even out the look of the shadow area.
 
Old 09 September 2012   #6
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