Set Rhino camera using GHPython.

set_rhino_camera.py

"""
Sets Rhino camera from starting location, target location and lens length.
    Args:
        S: Starting location.
        T: Target location.
        L: Lens length.
"""

ghenv.Component.Name = "Set Camera"
ghenv.Component.NickName = 'SetCam'

# Import libraries.
import Rhino
import Grasshopper as gh

# Warnings.
if not S:
        msg = "Input parameter 'S' failed to collect data."
        ghenv.Component.AddRuntimeMessage(gh.Kernel.GH_RuntimeMessageLevel.Warning, msg)
if not T:
        msg = "Input parameter 'T' failed to collect data."
        ghenv.Component.AddRuntimeMessage(gh.Kernel.GH_RuntimeMessageLevel.Warning, msg)
if not L:
        msg = "Input parameter 'L' failed to collect data."
        ghenv.Component.AddRuntimeMessage(gh.Kernel.GH_RuntimeMessageLevel.Warning, msg)

# Optional: Set Rhino viewport to alter.
views = Rhino.RhinoDoc.ActiveDoc.Views.GetViewList(True, False)
Rhino.RhinoDoc.ActiveDoc.Views.ActiveView = views[0] # Choose VP here.

# Set camera.
if S and T:
    vp = Rhino.RhinoDoc.ActiveDoc.Views.ActiveView.ActiveViewport
    vp.PushViewProjection()
    vp.Camera35mmLensLength = L
    vp.CameraUp = Rhino.Geometry.Vector3d.ZAxis
    vp.SetCameraLocation(S, False)
    vp.SetCameraDirection(T - S, True)