A model in DAVE is called a Scene. Elements/parts of a model are called Nodes.
So Nodes are placed in a Scene to model something.
Groups of nodes can be saved as an Asset. This is then a re-usable building block.
Axis systems are right-handed.
In the global axis system the Z-axis points up.
The mean sea-surface is defined as Z=0
The default unit system is m, kN, mT (metric tonne). G and RHO are defined accordingly.
Unfortunately there is no standard way of defining rotations in 3D.
DAVE uses a rotation vector to represent rotations. This means that the rotation is defined as a vector with three components (rx,ry,rz). The magnitude of the vector is the rotation in degrees. The axis of rotation is the direction of the vector.
(0,0,90): A rotation of 90 degrees about the Z-axis
(0,-10,0): A rotation of -10 degrees about the Y-axis
(10,10,0): A rotation of sqrt(10^2 + 10^2) about the (1,1,0) axis.
Hint: If euler angles are needed then axis systems can be stacked to obtain the same result.
The following 2D rotations are available: tilt_x, tilt_y, heel, trim, heading and heading_compass. These are derived from the projection of one of the local axis onto the global axis system. For example the tilt about the x-axis is derived from the z-component of the y-axis.
Example: A 3d rotation of (5,0,0) will give a heel of 5 degrees and a tilt_x of 8.7% A 3d rotation of (0,0,120) will give a heading of 120 degrees and a heading_compass of 330.