Sherif.Nagib
03-10-2004, 03:46 PM
Hey guys, I'm new to 3D tracking so here's my problem..
I wanted to track a nodal pan shot where the camera begins in the center.. then it rotates to look to the right side & then the left side in some exhibit. What I want to do is fill this exhibit with those security laser red lines (or maybe they're infrared. I don't know)..anyway, I did the tracking in Boujou, & you know with nodal pan shots you can't describe any geometry or define where ground is or where walls are . I exported it to 3d max as a max script which creates the camera automatically…the tracking is fine.. when I put something it remains in place with no shifts.
The problem is : when I place a straight line in front of the camera it doesn't look parallel with ground in the scene or perpendicular to the wall.. Look :
http://achilles.arabcg.com/big01.jpg
http://achilles.arabcg.com/camera.jpg
So I thought of rebuilding some cubes to match with those in scenes.. & I was shocked to find my self not able to match a 3D box to a real one.. it's not matching at all.. look at these images .. the first one is the original plate in max viewport with no 3d boxes :
http://achilles.arabcg.com/parll01.jpg
http://achilles.arabcg.com/parll02.jpg
http://achilles.arabcg.com/parll03.jpg
I don't know what's wrong.. the camera lens in max is 62 mm.. should I change this one ??.. it's created by the max script exported from Boujou.
Here's a small test that may help you understand the situation more.
a divx small test video - 1.29 MB (http://achilles.arabcg.com/videos/track.avi)
Plz help me guys :(
EDIT : forgot to say that.. the 3d box you see is tilted so it's not resting on 3d max grid.. If I made a box that rests on 3d max grid it doesn't give me even a close result & goes totay wrong.. so max grid isn't matching to the real ground.
I wanted to track a nodal pan shot where the camera begins in the center.. then it rotates to look to the right side & then the left side in some exhibit. What I want to do is fill this exhibit with those security laser red lines (or maybe they're infrared. I don't know)..anyway, I did the tracking in Boujou, & you know with nodal pan shots you can't describe any geometry or define where ground is or where walls are . I exported it to 3d max as a max script which creates the camera automatically…the tracking is fine.. when I put something it remains in place with no shifts.
The problem is : when I place a straight line in front of the camera it doesn't look parallel with ground in the scene or perpendicular to the wall.. Look :
http://achilles.arabcg.com/big01.jpg
http://achilles.arabcg.com/camera.jpg
So I thought of rebuilding some cubes to match with those in scenes.. & I was shocked to find my self not able to match a 3D box to a real one.. it's not matching at all.. look at these images .. the first one is the original plate in max viewport with no 3d boxes :
http://achilles.arabcg.com/parll01.jpg
http://achilles.arabcg.com/parll02.jpg
http://achilles.arabcg.com/parll03.jpg
I don't know what's wrong.. the camera lens in max is 62 mm.. should I change this one ??.. it's created by the max script exported from Boujou.
Here's a small test that may help you understand the situation more.
a divx small test video - 1.29 MB (http://achilles.arabcg.com/videos/track.avi)
Plz help me guys :(
EDIT : forgot to say that.. the 3d box you see is tilted so it's not resting on 3d max grid.. If I made a box that rests on 3d max grid it doesn't give me even a close result & goes totay wrong.. so max grid isn't matching to the real ground.