Colliders

Object Collider

Makes a scene object solid for the simulation: a sphere, a box or any mesh.

Outputs: Collider: A collider. Connect it to a solver’s Colliders input.

Setting	What it does	Default
Object	Scene object to collide against
Shape	How the object’s shape is represented to the simulation. Simple shapes run faster than a mesh	SPHERE
Friction	Tangential friction against this object (0 = slippery, 1 = sticky)	0.5
Static Friction	A separate friction that holds resting rigid shards on this obstacle	False
Static Friction	Impact only: friction that keeps resting shards from starting to slide. Used when Static Friction is on	0.7
Bounciness	Elastic bounce restitution against this obstacle	0
Dynamic (Two-Way)	Particles push, float and topple this object (SPHERE / BOX). Its pose is simulated and keyframed	False
Density (kg/m³)	Body density: lighter than the material it sits in floats (wood ~500, steel 7800)	500
Stickiness (m/s²)	Atom: how hard material clings to this surface, as the pull (acceleration) needed to tear it off. 0 lets go freely; ~g (9.8) holds mud on a vertical wall	0
Sample Budget	Hydro: maximum surface collision points to sample across this mesh (Atom, Blaze and rigid bodies use every triangle)	1024
Motion	Atom: how a mesh collider moves	AUTO
High-Speed Projectile	Enable swept capsule continuous collision detection (CCD) and spallation wake lookahead for high-speed bullets/balls	False

Ground Plane

An endless floor, level or tilted, that particles cannot pass through.

Outputs: Collider: A collider. Connect it to a solver’s Colliders input.

Setting	What it does	Default
Target Object	Optional Empty/Object whose 3D location and +Z normal orient the Ground Plane
Height (Z)	Ground floor height in normalized [0, 1] solver space	0.05
Tilt (Euler)	Euler rotation (XYZ) tilting the ground plane normal from +Z	(0, 0, 0)
Friction	Tangential friction of the ground (0 = slippery, 1 = sticky)	0.5
Bounciness	Bounce of the ground for particles and bodies (0 = none, 1 = elastic)	0
Stickiness (m/s²)	Atom: the pull needed to lift material off the ground (0 lets go freely)	0
Static Friction	A separate friction that holds resting rigid shards on this plane	False
Static Friction	Impact only: friction that keeps resting shards from starting to slide. Used when Static Friction is on	0.7

Kill Volume

Removes particles that enter (or leave) a box or a sphere, like a drain.

Outputs: Collider: A collider. Connect it to a solver’s Colliders input.

Setting	What it does	Default
Target Object	Optional Empty/Object whose 3D location and scale drive the Kill Volume
Shape	Box or sphere region where particles are removed (Blaze: an outflow that removes the gas)	BOX
Center (Z-Up)	Centre of the region without a Target, m	(0, 0, 0.2)
Size (m)	Dimensions of the region, m (a sphere uses X as its diameter)	(0.6, 0.6, 0.25)
Invert (Kill Outside)	When enabled, deletes particles that leave this volume instead of particles entering it	False

Blaze Outflow

Lets smoke and fire leave the Blaze domain through a region instead of bouncing back.

Outputs: Collider: A collider. Connect it to a solver’s Colliders input.

Setting	What it does	Default
Shape	The region where the gas is removed	BOX
Object	Object whose world bounding box is the region (Shape: Object)
Center (m)	Centre of a box or sphere region, m	(0, 0, 3)
Size (m)	Dimensions of a box region (a sphere uses X as its diameter), m	(4, 4, 0.5)
Removes	What the outflow removes (none: it does nothing)
Invert (Outside)	Remove the gas outside the region instead of inside it	False