Particle group> Glow group
The Glow group controls -- you guessed it -- a glow around the particles. Active when Glow Sphere or Star are chosen as the Particle Type.

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At left, the Glow group. At right, Glow Sphere and Star options in Particle Type.
Size %
Sets the size of the glow. Lower values give a faint glow. Higher values give a heavier glow to the particle.

Left to right, Size at 100 and 300. This example uses the preset 'tf2_Virus'.
Opacity %
Sets the opacity of the glow. Lower values give a transparent glow. Higher values give a more solid glow to the particle.

Left to right, Opacity at 10 and 100.
Feather %
Sets the softness of the glow. Lower values give a globular, solid edge. Higher values give a feathery soft edge to the particle.

Left to right, Feather at 30 and 100. This example uses the preset 'tf2_SimpleOval'.
Transfer Mode pop-up
The Transfer Mode controls how particles are composited together.
