Particle System Constraints

This article contains speculation that needs to be confirmed.

Particle Constraints prevent particles from passing through certain areas, such as brushes. The can also be user-defined, such as a 2-Dimensional plane.

Collision via traces

Uses traces for checking collisions.

collision mode

Type of collision? Valid ranges not known

collision group

Known arguments are NONE and DEBRIS?

amount of bounce

Amount of bounce force to apply when a collision occurs?

amount of slide

Amount of sliding force to apply when a collision occurs?

kill particle on collision

Destroys the particle when it collides with an object

brush only

If 1, the particle will collide only with brushes

trace accuracy tolerance

Amount of tolerance to use when calculating collisions. Higher values mean more tolerance, but less realistic collisions. Lower values mean more accurate collisions, most likely at the cost of additional calculations.

Prevent passing through a plane

Blocks particles from passing through an imaginary two-dimensional plane. Default settings make it at the bottom of the particle's origin.

global origin

Use global origin instead of particle origin? (Not recommended)

plane point

The 2nd Point to use to define the plane?

plane normal

3D vector that determines the angle of the plane (same concept as VPlane)

Prevent passing through static part of world

Prevents passing through any static part of the world. I.e. prop_statics, brushes, etc