Added width and height to the offscreen rendering output. By default, it outputs 512x512. We need the newest VTK installed if we want to output the image size larger than the physical screen, 
Added width and height to the offscreen rendering output. By default, it outputs 512x512. We need the newest VTK installed if we want to output the image size larger than the physical screen, 

minesense/VisTrails,Nikea/VisTrails,hjanime/VisTrails,VisTrails/VisTrails,Nikea/VisTrails,celiafish/VisTrails,VisTrails/VisTrails,minesense/VisTrails,hjanime/VisTrails,celiafish/VisTrails,minesense/VisTrails,VisTrails/VisTrails,Nikea/VisTrails,VisTrails/VisTrails,celiafish/VisTrails,hjanime/VisTrails,Nikea/VisTrails,minesense/VisTrails,VisTrails/VisTrails,minesense/VisTrails,celiafish/VisTrails,hjanime/VisTrails,hjanime/VisTrails