Version:

Collision Attribute

In the Collision attribute, specify how to control the particle’s physical setup.

[Collision attributes in the Particle Editor.]

CPU Collision Attribute Parameters

Name	Description
Physics Type	Specifies how the particle interacts physically. [See the AWS documentation website for more details]
Collide Terrain	Includes terrain in particle collisions. Default value: false
Collide Static Objects	Includes non-terrain, static objects in particle collisions. This is expensive. Default value: false
Collide Dynamic Objects	Includes non-terrain, dynamic objects in particle collisions. This is expensive. Default value: false
On Collide	Upon impact with the static environment, the particle dies. [See the AWS documentation website for more details] Default value: Die
Max Collision Events	Limits the number of collisions that the particle can have in its physics simulation. This affects only particles that have Physics Type set to Rigid Body. Valid values: `0` to `255`Default value: `0`
Bounciness	Controls the elasticity for collision response. This affects only particles that have Physics Type set to Simple Collision. You can override this feature by setting Surface Type. You can also use a special value of –1 to have the particle die on first collision. Valid values: anyDefault value: `0`
Collision Fraction	Determines the fraction of emitted particles that perform collisions. Valid values: `0` to `1`Default value: `1`
Collision Cutoff Distance	Specifies the maximum distance from the camera at which collisions are performed. A value of 0 means infinite. Valid values: `0+`Default value: `0`
Surface Type	Selects from a variety of surface material types for the collision behavior. If set, Surface Type overrides Bounciness and Dynamic Friction. Default value: none
Dynamic Friction	The coefficient of dynamic friction. If set, Surface Type overrides Dynamic Friction. This affects only particles that have Physics Type set to Simple Collision. Valid values: `0+`Default value: `1`
Thickness	Controls the fraction of the particle’s visible radius to use for the physical radius. This affects particles that have Physics Type set to Simple Physics and geometry particles that have Physics Type set to Simple Collision. Valid values: `0+`Default value: `1`
Density	Controls the particle density in kg/m^3. An example of a physically correct value is Water = 1000. This affects only particles that have Physics Type set to Simple Physics or Rigid Body. Valid values: `0+`Default value: `1000`

[Collision attributes for GPU in the Particle Editor.]

GPU Collision Attribute Parameters

Name	Description
Depth Collision	Specifies how the particle interacts physically. [See the AWS documentation website for more details]
Cubemap Far Plane	Sets the far plane distance for cubemap depth buffer generation. Default value: `20`
Die on Collide	Upon impact with the static environment, the particle dies. [See the AWS documentation website for more details] Default value: Die
Bounciness	Controls the elasticity for collision response. This affects only particles that have Physics Type set to Simple Collision. You can override this feature by setting Surface Type. You can also use a special value of –1 to have the particle die on first collision.Valid values: anyDefault value: `0`
Thickness	Controls the fraction of the particle’s visible radius to use for the physical radius. This affects particles that have Physics Type set to Simple Physics.Valid values: `0+`Default value: `1`