Intact.Simulation computations are fundamentally based on the unit system in use in the Rhino document. Failure to pay heed to the unit system can lead to unexpected and incorrect results.

For example, consider a beam restrained at the left end with a 1000 N load applied to the right end as shown below. With a simulation set up using millimeter length units in Rhino, the danger level in the beam exceeds 1 almost everywhere and indicates the beam is grossly overloaded.

However, if the beam is modeled in meters, the result is quite different: the beam will not fail. Note that in both cases, Rhino shows the dimension of the beam to be 10.00.

The unit system in a simulation is based on the length units of the current Rhino document and follow the following table:

Derived units such as acceleration, torque, and density are consistent within each unit system.

• Linear acceleration units are length/s²
• Torque units are force·length
• Density units are mass/length³

Across the several unit systems, the rotational units are the same. Namely:

• Rotational velocity units are rad/s
• Rotational acceleration units are rad/s²