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This is a test for the CalculateScreenVelocity BillboardOriented actions for Stardust 3D (the Stardust native 3D engine). The CalculateScreenVelocity action projects a particle's velocity vector in 3D space onto the screen, yielding a 2D vector. The BillboardOriented action then align 2D display objects' rotation values to these 2D vectors.
You can pause the example by pressing the "Pause" button at the bottom left. The simulation will stop, but the particles will still align to their projected 2D velocities as you rotate the camera.
The source files for this example can be found here.