How can I get a stereo cameras volume and parameters? I need to find some parameter of the stereo camera.
In particular I need:


The distance of the near and far plane and where are them (for calculate the dimensions, the position of the vertices of the panel, etc.)
Where exactly is the volume of the camera situated (the volume you can see if you enable the option in the 3D view generic properties)
The formula used to calculate this data in blender (who knows where the file with this formula is? 

import bpy

scene = bpy.context.scene
cam = scene.camera
print("convergence_distance: %f" %cam.data.stereo.convergence_distance)
print("convergence_mode: %r" %cam.data.stereo.convergence_mode) 
print("interocular_distance: %f" %cam.data.stereo.interocular_distance) 
print("pivot: %s" %cam.data.stereo.pivot) 
print("focal_length: %f" %cam.data.lens)
print("gpu_dof.focal_length: %f" %cam.data.gpu_dof.focal_length)
print("gpu_dof.focus_distance: %f" %cam.data.gpu_dof.focus_distance)
print("gpu_dof.is_hq_supported: %s" %cam.data.gpu_dof.is_hq_supported)
print("lens_unit: %s" %cam.data.lens_unit)
print("sensor_width: %f" %cam.data.sensor_width) 
print("clip_end: %f" %cam.data.clip_end) 
print("rotation_euler: x = {0}, y = {1}, z = {2}".format(*cam.rotation_euler))
print("location: x = {0}, y = {1}, z = {2}".format(*cam.location)) 
print("sensor_height: %f" %cam.data.sensor_height) 
print("sensor_width: %f" %cam.data.sensor_width) 
print("angle: %f" %cam.data.angle) 
print("angle_x: %f" %cam.data.angle_x) 
print("angle_y: %f" %cam.data.angle_y) 
print("cam.matrix_local")
print(cam.matrix_local)
print("cam.matrix_basis")
print(cam.matrix_basis)
print("cam.matrix_world")
print(cam.matrix_world)
print("cam.calc_matrix_camera(x=1, y=1, scale_x=1.0, scale_y=1.0)")
print(cam.calc_matrix_camera(x=1, y=1, scale_x=1.0, scale_y=1.0))**



with this code i have some camera parameters but i don't know how to find the others.

tips?
The code in properties_data_camera.py can give you clues to most of the camera properties.

The volume options for the 3DView are displayed with code in space_view3d.py and use properties within the 3DView data eg. context.space_data.show_stereo_3d_volume.

The volume pyramid drawn for this option is based on a pyramid created from the camera location/rotation, using cam.lens which is shown to the user as focal length and cam.sensor_width (sensor size). The cam.clip_start and cam.clip_end define where the top and bottom of this pyramid are. The actual c-code that does the drawing can be found in drawobject.c

The location of the convergence plane is based on stereo.convergence_distance and looks to use the same calculations as clip_start with the outer edges based on the same volume pyramid.