A Compositing / RotoShape Node question

I'm a very new Shake user, and having some trouble getting my mind around Chapter 6: Rotoscoping, in the User Manual.
If I have a guy walking across a room and I want to make the top half of his body disappear, can that be done with a Rotoshape?
My two video clips are: #1 -- a clean plate, a shot of the room with nothing in it, the camera locked off on a tripod. #2 -- the same locked-off shot with the guy walking across the room.
I thought it would be easy to draw a rotoshape on top of clip #2 that would cover the top half of the guy's body, a black shape that would create transparency where the guy's body was. Then I would composite the clean plate clip #1 underneath clip #2 to "fill in" the missing body with the rest of the room.
But I must not be setting up my node tree properly. When I connect a rotoshape node to Clip #2, and load the rotoshape node into the viewer to draw the shape, I am not sure where to draw it, because I cannot see the clip that shows the position of the guy's body. And beyond that, if I did draw the rotoshape in the correct place, would it serve as an alpha channel for Clip #2, knocking out the top half of the body?
Am I conceptualizing this in the most efficient way? Any tips on setting up the nodes would be greatly appreciated!
Jim

Thanks much, Jon and Captain! Your comments are enlightening. I tried both methods, and Jon's worked a little better for me. Using Captain's main clip to switchmatte and rotoshape to switchmatte, I got a weird dark outline around the rotoshape I drew that I did not get when I went rotoshape directly into the mask channel of the foreground clip, and then from there main clip and cleanplate into an over node. But other than that dark outline (and it may have been operator error of some kind) the compositing theory worked.
On Captain's comment -- "Plus, adding multiple masks becomes easier, less messy and more practical. How do you add a second mask?" -- I was under the impression that you could have more than one mask, or rotoshape, on a rotoshape node. Page 157 in the user manual, Volume II: Compositing, says "To create another shape, click the Add Shapes button again." That seemed to work for me. I was able to add a second mask, if I am using the terminology right. Or maybe what I was adding was a "rotoshape," but I thought of it as a mask because I inverted it to black to make something in my foreground image "disappear" and let the cleanplate show through to fill in the missing section of the foreground clip.
In any case, as a Shake user of just a few days now, it gives me an idea that there are multiple ways to get to the same destination.
Thanks again, Jon and Captain, for the advice.
Jim

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Sebastian : Thanks. I did come across this white paper & now I have converted they ASM disks to physical. When you say just direcly pass LUNs from storage, its still going to be a virtual block device off the RAW lun to OVS, is that what you meant? .. ie RAW disk to OVS --> use phy: directive to present and xvd"n" to vm (PV block driver)
ssolbach wrote:
Hi,
1.) It is recommended to use physical disks for all ASM disks (also for OCR and Vote). If you use 11.2. then OCR/Vote are on ASM anyway.
See also: http://www.oracle.com/technetwork/database/clustering/oracle-rac-in-oracle-vm-environment-131948.pdf
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Avi Miller wrote:
Also note that you should be using the file: driver with Oracle VM, not tap:aio -- all of the Oracle performance improvements went into the loopback driver that uses the file method.Edited by: Abhijit on Dec 8, 2011 7:14 AM
Edited by: Abhijit on Dec 8, 2011 7:15 AM
Edited by: Abhijit on Dec 8, 2011 7:18 AM
Edited by: Abhijit on Dec 8, 2011 7:19 AM

A Compositing / RotoShape Node question

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