Hi Matt, The Chimera camera always points along the negative z-axis. The positions of the models are moved/rotated to get different view-points. Do you mean you want camera location (x,y,z) and horizontal angular field of view to the edges of the window (for perspective projection)? I know how to get at these using Python code, but I'm not sure if any Chimera commands report those values. Also I don't know if that info makes its way into X3D or VRML exported from Chimera. Greg Couch would know these answers. He is at SIGGRAPH this week. A quite gruesome way to get the parameters is to find them in the Chimera session file. grep formattedPositions mysession.py formattedPositions = {'p2': (0.3954088241213373, 18.749999499320985, (14.059999585151672, 7.399999618530273, 8.628906249999993), (36.02048479676247, -18.762672296762467), 8.62890625, {(0, 0): ((13.338430482851305, 2.7738552720503122, 6.309792459458727), (0.3889244976446376, 0.8937166155966246, 0.22362545950400858, 33.757570197325826))}, {(0, 0, 'Volume'): (False, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, False, 5.0)}, 4, (29.312384727061698, 10.919780805124898, 8.628906249999993), False), 'p1': (1.0, 18.749999499320985, (14.059999585151672, 7.399999618530273, 8.62890625), (36.02048479676247, -18.762672296762467), 8.62890625, {(0, 0): ((-1.913954659058722, -0.7459259145443079, 6.309792459458727), (0.3889244976446376, 0.8937166155966246, 0.22362545950400858, 33.757570197325826))}, {(0, 0, 'Volume'): (False, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, False, 5.0)}, 4, (14.059999585151669, 7.399999618530277, 8.628906249999993), False)} This is pretty messy and the values depend on which Chimera version saved the file. The values are defined by Python code chimera/share/Midas/__init__.py in the _savePosition() routine: return ( viewer.scaleFactor, viewer.viewSize, cam.center, cam.nearFar, cam.focal, xforms, clips, om.cofrMethod, cofr, viewer.clipping ) If you want a Python script to simply dump the camera positions for all savepos positions I can provide that. Tom
Hi Tom,
I am creating a workaround for my graphics problem. What I have done in the past is to create a VRML file from Chimera export, extract the openGL camera parameters using a text editor, start up Amira, using TCL I would recreate the same camera view within Amira. At this point I could splice animation clips made by Chimera& Amira using Final Cut Pro.
It has been a while since I have done this. I am now looking at the exported VRML files and they are lacking the camera info.
Is there a command I can use to get the camera parameters for the savepos keyframes?
thanks, Matt