Goal: something like this https://www.trackplanning.com/3pi.htm

Candidates that should work for either JVM desktop or Android:

• jMonkeyEngine
• https://github.com/jMonkeyEngine/jmonkeyengine
• Overview: https://android-arsenal.com/details/1/1390
• libGDX
• https://github.com/libgdx
• Overview: https://android-arsenal.com/details/1/11
• jPCT
• http://www.jpct.net/about.html (JVM)
• http://www.jpct.net/jpct-ae/index.html (Android)
• Overview: https://android-arsenal.com/details/1/10
• SmartGL
• https://github.com/smart-fun/smartGL
• Overview: https://android-arsenal.com/details/1/4715

Upfront, jMonkeyEngine describes itself as a full environment, SmartGL as just a 2d/3d view wrapper, GDX and PCT seem more in-between.

Requirements:

• Fullscreen or view
• Basic physics
• 3D import… which format, from where?
• Interactivity

Looking at this:

• SmartGL seems limited to exactly what’s in the name.
• jPCT seems to have a clear distinction between desktop and Android. Can’t tell how recent it is.
• libGDX seems to have good modern support and good wiki tutorials to get started. There are also wrappers for Bullet and Box2D for physics engines and corresponding tutorials.
• https://xoppa.github.io/blog/using-the-libgdx-3d-physics-bullet-wrapper-part1/
• https://github.com/libgdx/libgdx/wiki/Box2d

So let’s start with libGDX.