This is the place where you specify the physical properties of a collision object.

This set of parameters contains two subcategories

RealFlow Scene

In RealFlow | Maya it is possible to use multiple "Scene" trees in the same project. To link a daemon to a different scene tree right-click on the field, choose "Set Scene", and select an item from the appearing list.

Collision Geometry

If you want to change the collision object right-click on the field and choose "Set Body" to select a new node.

Linked Domains

All fluid, rigid, and elastic containers inside the field will be affected by the collider.

Connections to more containers have to be established manually by clicking on "Add Object(s)". From the appearing list you can choose other nodes.
To break a connection select one or more containers from the "Linked Domains" field and click "Remove Object(s)".

Collision

Here an object's collision behaviour can be adjusted.

Enable Collision

Enable or disable the particle-object collision on demand, e.g. by animating this option.

Collision Distance

This parameter describes the distance between the colliding particles and an object's surface.

Auto Continuous Collision Detection

If you want to enable or disable "Continuous Collision Detection" manually, reactive this option.

Continuous Collision Detection

This option prevents particles from going through thin objects such as glasses, planes. etc.:

When an object is in "Shell" mode (see "Volume Mode" in the "Volume" section of an object), "Continuous Collision Detection" is active by default.
If the object's "Volume Mode" is "Solid Inside" or "Solid Outside you can deactivate this feature manually.

Interaction

Define properties like friction, stickiness or roughness.

Friction

A value of 0.0 creates absolutely no friction and a perfectly even surface. Higher values can even stop particles from moving. This parameter accepts all positive values between 0.0 and 1.0.

"Friction" can be controlled through → textures.

Bounce

A value of 0.0 creates perfect elasticity, while higher settings make the particles lose appropriate amounts of their energy. The maximum value is 1.0.

"Bounce" can be controlled through → textures.

Sticky

It can be seen as a “glue factor” to make particles stick on the object’s surface. You can use positive (attraction) and negative (repulsion) settings.

"Sticky" can be controlled through → textures.

Roughness

This value ranges between 0.0 and 1.0 and adds randomness to the object’s polygon normals to produce a slightly different collision direction.

"Roughness" can be controlled through → textures.

Collider Velocity Factor

This parameter is only relevant in conjunction with moving objects. "Collider Velocity Factor"

accepts any positive value including 0
is mainly used if the collision between particles and objects turns out too weak
can be controlled through → textures.

Interaction Distance

With 10, for example, particles within a distance of 10 units (depends on the actual scene scale) from the object's surface will be affected by parameters like "Friction", Bounce", etc. The value is calculated automatically based on "Collision Distance". For manual control uncheck "Auto Interaction Distance".

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