Camera Frustum Tool
It is a very simple idea, and adds a frustum to the selected camera, in this case, a red polygon object. The object generated matches the camera’s frustum setting, which can be found in the attribute editor. I use this for techvis or when I need to demonstrate what the camera sees from another view.
The script locks the translates and rotations of the red frustum object, leaving the scale for tuning. The frustum is parented under the camera.
Code snippet.