Hi Benjamin,
In the initialization script, you can use the createShape function to create the sphere and specify its color. There should already be an example in there by default that is commented out for a box shape.
On the Inputs tab of the Simulation 3D Actor, you can specify properties that you would like to create an Inport for such as position or velocity and you can use these to move the red sphere around the scene.
Note that you will need to set the 'Mobility' property of the Actor to sim3d.utils.MobilityTypes.Movable in order to move it around the scene.
To record, unfortunately we don't have any built-in capabilities to record the Viewer yet, though this is an important feature that we are considering for inclusion in a future product release. For now, you will need to screen record to obtain a video.
I hope this helps, and please let me know if you have any additional questions.
Nishan
