One hard sphere is moving in a cubic box with semicircular scatterers mounted on some walls.

Velocity space is now 3-dimensional, with a 2-dimensional spherical energy surface.

To demonstrate the equal a priory density on the energy surface we project the spherical surface onto a rectangle, using Lambert's area preserving (and therefore density preserving) projection.

Interestingly, the velocity density p(v_x) is now a constant.

[Code: Hspheres]

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