# Nodes overview¶

A short overview of all available node types is given here. You may skip this section if you want.

## Backbone¶

Type

Provides

Axis

An axis system with position and orientation and optionally a parent

RigidBody

An Axis with cog and weight

## Geometry¶

Type

Provides

Point

A 3d location

Circle

A circle with radius and orientation

## Connectors¶

Connectors connect two or more nodes and can apply a force on them based on their positions and orientations.

Type

Provides

Cable

A finite length cable with linear stiffness. A cable runs between two Point nodes and can run over multiple pois or circles. A cable may have a diameter.

LinearBeam

A beam connects two axis systems with a linear beam element

LC6d

Connects two axis systems with six linear springs. Orientation of the springs is determined by the main axis system

Connector2d

Connects two axis systems with two linear springs. Orientation of the springs is determined by shortest distance between the two axis systems

## Forces¶

Forces apply a force to a node. The magnitude of the force may depend on the position and/or orientation of the node.

Type

Provides

Force

An fixed force and/or moment applied on a Point

HydSpring

A linear hydrostatic spring attached to an Axis

Buoyancy

A buoyancy mesh (.obj or .stl) attached to an Axis

Tank

A (ballast)tank mesh (.obj or .stl) attached to an Axis

BallastSystem

A group of ballast-tanks for which a ballast-plan can be created

## Contact¶

Basic elastic contact can be modelled using meshes and contact-balls.

Type

Provides

ContactBall

A ball with a radius and a stiffness

ContactMesh

A mesh that can contact a contact ball

## Information¶

Type

Provides

Visual

(Almost) Everything gets better when visualized :-).

WaveInteraction1

1 st order hydrodynamic database

## Groups¶

Nodes or groups of nodes can be “managed” by another node. This makes it possible to standardize common groups of nodes. For example the nodes that make up a shackle or sling.

Type

Provides

GeometricContact

Bar-Bar or Pin-in-hole connections

Sling

A sling “splice” with eyes, mass, etc

Shackle

A standard shackle