Size of the particle in quants.
0 .. 16 (default: 4).
The rendering speed of particles depends on their size. Oversized particles can be very slow.
The size of a particle is limited by the hardware, and can be below 16. The DirectX Caps Viewer can be used to check the
maximum point size of the 3D card.
lifespan, x,y,z, vel_x, gravity, size, alpha, red,green,blue, bmap, BRIGHT, TRANSLUCENT, MOVE, STREAK, event, skills, effect