/// <summary>
/// Calculates the area of an object
/// </summary>
public static double GetArea(IRhinoObject obj, double tol)
{
if (null != obj)
{
IOnCurve crv = OnCurve.ConstCast(obj.Geometry());
if (null != crv)
{
return(GetCurveArea(crv, tol));
}
IOnSurface srf = OnSurface.ConstCast(obj.Geometry());
if (null != srf)
{
return(GetSurfaceArea(srf));
}
IOnBrep brep = OnBrep.ConstCast(obj.Geometry());
if (null != brep)
{
return(GetBrepArea(brep));
}
IOnMesh mesh = OnMesh.ConstCast(obj.Geometry());
if (null != mesh)
{
return(GetMeshArea(mesh));
}
}
return(0.0);
}
///<summary> This gets called when when the user runs this command.</summary>
public override IRhinoCommand.result RunCommand(IRhinoCommandContext context)
{
MRhinoGetObject go = new MRhinoGetObject();
go.SetCommandPrompt("Select solid meshes for volume calculation");
go.SetGeometryFilter(IRhinoGetObject.GEOMETRY_TYPE_FILTER.mesh_object);
go.SetGeometryAttributeFilter(IRhinoGetObject.GEOMETRY_ATTRIBUTE_FILTER.closed_mesh);
go.EnableSubObjectSelect(false);
go.EnableGroupSelect();
go.GetObjects(1, 0);
if (go.CommandResult() != IRhinoCommand.result.success)
{
return(go.CommandResult());
}
List <IOnMesh> meshes = new List <IOnMesh>();
for (int i = 0; i < go.ObjectCount(); i++)
{
IOnMesh mesh = go.Object(i).Mesh();
if (mesh != null)
{
meshes.Add(mesh);
}
}
if (meshes.Count == 0)
{
return(IRhinoCommand.result.nothing);
}
OnBoundingBox bbox = new OnBoundingBox();
for (int i = 0; i < meshes.Count; i++)
{
meshes[i].GetBoundingBox(ref bbox, 1);
}
On3dPoint base_point = bbox.Center();
double total_volume = 0.0;
double total_error_estimate = 0.0;
string msg;
for (int i = 0; i < meshes.Count; i++)
{
double error_estimate = 0.0;
double volume = meshes[i].Volume(base_point, ref error_estimate);
msg = string.Format("Mesh {0} = {1:f} (+/- {2:f}\n", i, volume, error_estimate);
RhUtil.RhinoApp().Print(msg);
total_volume += volume;
total_error_estimate += error_estimate;
}
msg = string.Format("Total volume = {0:f} (+/- {1:f})\n",
total_volume,
total_error_estimate);
RhUtil.RhinoApp().Print(msg);
return(IRhinoCommand.result.success);
}
private static double GetMeshVolume(IOnMesh mesh)
{
double volume = 0.0;
if (null != mesh)
{
OnMassProperties mp = new OnMassProperties();
if (mesh.VolumeMassProperties(ref mp, true))
{
volume = Math.Abs(mp.Volume());
}
}
return(volume);
}
private static double GetMeshArea(IOnMesh mesh)
{
double area = 0.0;
if (null != mesh)
{
OnMassProperties mp = new OnMassProperties();
if (mesh.AreaMassProperties(ref mp, true))
{
area = Math.Abs(mp.Area());
}
}
return(area);
}
public override bool CustomGeometryFilter(IRhinoObject obj, IOnGeometry geo, OnCOMPONENT_INDEX ci)
{
if (geo != null)
{
IOnCurve crv = OnCurve.ConstCast(geo);
if (crv != null)
{
if (crv.IsClosed() && crv.IsPlanar())
{
return(true);
}
else
{
return(false);
}
}
IOnBrep brep = OnBrep.ConstCast(geo);
if (brep != null)
{
if (brep.m_F.Count() == 1)
{
return(true);
}
else
{
return(false);
}
}
IOnSurface srf = OnSurface.ConstCast(geo);
if (srf != null)
{
return(true);
}
IOnMesh mesh = OnMesh.ConstCast(geo);
if (mesh != null)
{
return(true);
}
}
return(false);
}
/// <summary>
/// Calculates the volume of an object
/// </summary>
public static double GetVolume(IRhinoObject obj)
{
if (null != obj && obj.IsSolid())
{
IOnSurface srf = OnSurface.ConstCast(obj.Geometry());
if (null != srf)
{
return(GetSurfaceVolume(srf));
}
IOnBrep brep = OnBrep.ConstCast(obj.Geometry());
if (null != brep)
{
return(GetBrepVolume(brep));
}
IOnMesh mesh = OnMesh.ConstCast(obj.Geometry());
if (null != mesh)
{
return(GetMeshVolume(mesh));
}
}
return(0.0);
}
private static double GetMeshVolume(IOnMesh mesh)
{
double volume = 0.0;
if (null != mesh)
{
OnMassProperties mp = new OnMassProperties();
if (mesh.VolumeMassProperties(ref mp, true))
volume = Math.Abs(mp.Volume());
}
return volume;
}
private static double GetMeshArea(IOnMesh mesh)
{
double area = 0.0;
if (null != mesh)
{
OnMassProperties mp = new OnMassProperties();
if (mesh.AreaMassProperties(ref mp, true))
area = Math.Abs(mp.Area());
}
return area;
}
