public void CDS_FindClosestPointOnSurface()
{
ObjectId surfaceId = promptForTinSurface();
if (surfaceId.IsNull)
{
write("\nNo TIN Surface selected.");
return;
}
PromptPointResult result = _editor.GetPoint(
"\nSelect point outside surface: ");
if (result.Status != PromptStatus.OK)
{
write("\nNo point selected.");
return;
}
Point3d selectedPoint = result.Value;
Point3d closestPointFound = Point3d.Origin;
double shortestDistanceSoFar = Double.MaxValue;
using (Transaction tr = startTransaction())
{
TinSurface surface = surfaceId.GetObject(OpenMode.ForRead)
as TinSurface;
write("\nSelected surface: " + surface.Name);
write("\nSelected point: " + selectedPoint.ToString());
ObjectIdCollection borders = surface.ExtractBorder(
SurfaceExtractionSettingsType.Model);
foreach (ObjectId borderId in borders)
{
Polyline3d border = borderId.GetObject(OpenMode.ForRead)
as Polyline3d;
Point3d closestToBorder =
border.GetClosestPointTo(selectedPoint, false);
double distance = selectedPoint.DistanceTo(closestToBorder);
if (distance < shortestDistanceSoFar)
{
closestPointFound = closestToBorder;
shortestDistanceSoFar = distance;
}
}
}
write("\nClosest point found: " + closestPointFound.ToString());
using (Transaction tr = startTransaction())
{
BlockTableRecord btr = tr.GetObject(_database.CurrentSpaceId,
OpenMode.ForWrite) as BlockTableRecord;
Line line = new Line(selectedPoint, closestPointFound);
btr.AppendEntity(line);
tr.AddNewlyCreatedDBObject(line, true);
tr.Commit();
}
}
public void GetBorderFromSurface()
{
ObjectIdCollection entityIds = ts.ExtractBorder(Autodesk.Civil.SurfaceExtractionSettingsType.Model);
border = ObjectId.Null;
try
{
for (int i = 0; i < entityIds.Count; i++)
{
ObjectId entityId = entityIds[i];
if (entityId.ObjectClass == RXClass.GetClass(typeof(Polyline3d)))
{
border = entityId; //entityId.GetObject(OpenMode.ForRead) as Polyline3d;
}
}
}
catch (System.Exception ex)
{ }
}
public void ExtractBorder(Transaction trans, ObjectId surfaceId)
{
TinSurface surface = trans.GetObject(surfaceId, OpenMode.ForRead) as TinSurface;
// Extract Border from the TinSurface
// The extracted entities can be Polyline, Polyline3d, or Face.
ObjectIdCollection entityIds;
entityIds = surface.ExtractBorder(Autodesk.Civil.SurfaceExtractionSettingsType.Plan);
for (int i = 0; i < entityIds.Count; i++)
{
ObjectId entityId = entityIds[i];
if (entityId.ObjectClass == RXClass.GetClass(typeof(Polyline3d)))
{
Polyline3d border = entityId.GetObject(OpenMode.ForWrite) as Polyline3d;
// Do what you want with the extrated 3d-polyline
}
}
}