[io] improve help message of vview
@@ -151,10 +151,13 @@ class VViewOptions(object):
frames per second of generated video (default 25)
--camera=x,y,z
initial position of the camera (default=above looking down)
+ current camera position can be obtained with the key c
--lookat=x,y,z
initial direction to look (default=center of bounding box)
--up=x,y,z
initial up direction of the camera (default=y-axis)
+ --clipping=x,y,z
+ initial clippring range of the camera
--ortho=scale
start in ortho mode with given parallel scale
(default=perspective)
