pcl_pcd_viewer: Display point clouds.

OPTIONS

-bc r,g,b: background color
-fc r,g,b: foreground color
-ps X: point size (1..64)
-opaque X: rendered point cloud opacity (0..1)
-ax n: enable on-screen display of XYZ axes and scale them to n
-ax_pos X,Y,Z: if axes are enabled, set their X,Y,Z position in space (default 0,0,0)
-cam (*): use given camera settings as initial view (*) [Clipping Range / Focal Point / Position / ViewUp / Distance / Field of View Y / Window Size / Window Pos] or use a <filename.cam> that contains the same information.
-multiview 0/1: enable/disable auto-multi viewport rendering (default disabled)
-normals 0/X: disable/enable the display of every Xth point's surface normal as lines (default disabled)
-normals_scale X: resize the normal unit vector size to X (default 0.02)
-pc 0/X: disable/enable the display of every Xth point's principal curvatures as lines (default disabled)
-pc_scale X: resize the principal curvatures vectors size to X (default 0.02)