[Houdini] [Python] Export viewport image.

export_viewport_image.py

from time import gmtime, strftime

cur_desktop = hou.ui.curDesktop()
desktop = cur_desktop.name()
viewer = hou.paneTabType.SceneViewer
panetab = cur_desktop.paneTabOfType(viewer).name()
persp = cur_desktop.paneTabOfType(viewer).curViewport().name()
camera_path = desktop + '.' + panetab + '.' + 'world.' + persp
hn = hou.getenv('HIPNAME')
defaultName = strftime(hn + '%Y%m%d.jpg', gmtime())
filename = hou.ui.selectFile(title='Select Screenshot File',
                             default_value=defaultName,
                             file_type=hou.fileType.Image)

if filename is not None:
    frame = hou.frame()
    hou.hscript("viewwrite -f %d %d %s '%s'" % (frame, frame,
                camera_path, filename))