Why is the displacement value too low?
• Possible reasons for this include: • If you have modeled only half of the hull, but not checked the “Mirror About the Centerplane” box, your values will be half of what they should be. • Orca3D computes most of the hydrostatic data from a surface mesh, not with the traditional approach of integrating stations. The user has control over the density of this mesh, just as you do with Rhino’s display or analysis mesh. If the mesh is too coarse, your values will be low. If they are too high, it will slow down the computations without adding appreciable accuracy. The settings may be adjusted using the OrcaProperties command. You should experiment with different settings, and see their effect on your results. As you increase the density of the mesh, you will reach a point of diminishing returns. • Surfaces in Rhino have the concept of an “inside” and an “outside.” The outside should be the side in contact with the water; if not, the volume of that surface will be computed to be negative. If
