粒子生命

Create a few groups of particles, each with a colour, and a square matrix of interaction coefficients between groups in [-1, 1]. Each frame, for every particle sum forces from particles of each group within a radius, using coefficient times 1/distance (or a piecewise curve that is repulsive at very short range). Add the force to velocity, multiply by a friction factor, update position and bounce or wrap at edges. Expose the matrix as sliders with a randomise button, and use a spatial grid to scale beyond a few thousand particles.