Adding Custom 3D Models

[joaq-ram]

Would like to ability to import custom models (.obj, .3ds) into the widget for visualization purposes. These models could range in size from spacecraft to planetary bodies. Having the ability to modify the translucence of these models/surfaces would also be helpful.

The use case this issue popped up from was the desire to visualize Jupiter's magnetopause/bowshock using a 3D model of some sort. This is vital when visualizing magnetometer data to establish a reference for each data value.