Implementation of 3D Dilute Gas Visualization

Tsartsidze, Giorgirequested to merge
g.dilute3Dgas into develop

closes #1256 (closed)

  • Implement real-space 3D visualization for Dilute3D (random gas), replacing the "not implemented yet" placeholder
  • New randomPositions3D function generates random x,y,z positions in a thin slab (one particle diameter thick), with z-shifted so the lowest particle sits on the layer surface
  • Uses volume density to compute particle count (N = density * Lxy^2 * Lz), capped at 200 particles
  • Slab thickness matches Dense3D for consistent particle counts at equal density
Edited by Tsartsidze, Giorgi

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