 | | | Tracking rig | Tracking rig 2004-06-16 - By kim aldis
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As promised a week or two ago, a track rig that uses output from a track
node to build a rig. The script builds a rig with a frame to which is
attached a null. The null is constrained to the tracker ouptut, the scale of
the frame constrained to the camera FOV. You can move the frame back and
forth along the rig bone to get the 3rd dimension (z depth) by eye and
edumacated gueswork. The idea would be to parent/constrain the thing you
need to track back to the tracked null on the frame. Comments, thoughts, etc
back to me. Enjoy:)
(jscript, btw)
Useage:-
// Useage: run, pick when prompted:-
// the camera
// the tracker node in the fxtree
// the input node in the fxtree that feeds the tracker ( so we can pull out
the x/y res of the
// tracked image (is there an way to get this from the tracker????
//
//
// the rig produces a rectangular frame on a bone, the bone being
constrained to the camera.
// z depth on the tracked point - the sole unknown in the equation - can
animated by translating the frame back and forth
// in parent (the bone) space.
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<DIV><SPAN class=687164222-15062004><FONT face=Arial size=2>As promised a week
or two ago, a track rig that uses output from a track node to build a rig.
The script builds a rig with a frame to which is attached a null.
The null is constrained to the tracker ouptut, the scale of the
frame constrained to the camera FOV. You can move the frame back and forth
along the rig bone to get the 3rd dimension (z depth) by eye and
edumacated
gueswork. The idea would be to parent/constrain the thing you need to track
back
to the tracked null on the frame. Comments, thoughts, etc back to me.
Enjoy:)</FONT></SPAN></DIV>
<DIV><SPAN class=687164222-15062004><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=687164222-15062004><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=687164222-15062004><FONT face=Arial size=2>(jscript,
btw)</FONT></SPAN></DIV>
<DIV><SPAN class=687164222-15062004><FONT face=Arial
size=2>Useage:-</FONT></SPAN></DIV>
<DIV><SPAN class=687164222-15062004><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=687164222-15062004><FONT face=Arial size=2><FONT size=1>
<P>// Useage: run, pick when prompted:-<BR>// the camera<BR>// the tracker node
in the fxtree<BR>// the input node in the fxtree that feeds the tracker ( so we
can pull out the x/y res of the <BR>// tracked image (is there an way to get
this from the tracker????<BR>//<BR>//<BR>// the rig produces a rectangular
frame
on a bone, the bone being constrained to the camera.<BR>// z depth on the
tracked point - the sole unknown in the equation - can animated by translating
the frame back and forth<BR>// in parent (the bone)
space.</P></FONT></FONT></SPAN></DIV></BODY></HTML>
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