made a few fixes

code/svis.py

@@ -3,24 +3,29 @@ This is the visualization backend for bare_sim module
 '''
 try:
 	import visual as vs
-	from visual import vector as v
+	from visual import vector as vv
 except ImportError:
-	from vector import Vector as v
+	from vector import Vector as vv
+# 	from vector import Vector as vector
+	pass
+from vector import Vector as v
 
 from geom import Camera
 
 from util import drawAxes
+# converts a vector object into a visual vector object
+v_to_vv = lambda vec: vv(vec.x, vec.y, vec.z)
 
 def drawCameraFrame(cam):  # create frame and draw its contents
 	c = v(cam.t)
-	cam.center = vs.sphere(pos=c,
+	cam.center = vs.sphere(pos=v_to_vv(c),
 	                        radius=Camera.default_radius,
 	                        color=vs.color.green)
-	cam.dir = vs.arrow(pos=c,
-	                    axis=v(cam.direction) * cam.f,
+	cam.dir = vs.arrow(pos=v_to_vv(c),
+	                    axis=v_to_vv(v(cam.direction)) * cam.f,
 	                    shaftwidth=1.0)
 	# TODO: check for orientation of the camera, rotate plane accordingly
-	cam.img_plane = vs.box(pos=c + cam.dir.axis,
+	cam.img_plane = vs.box(pos=v_to_vv(c) + v_to_vv(cam.dir.axis),
 	                        length=cam.image_width, 
 	                        width=0.5,
 	                        height=cam.image_width,