Hi @dale, I’m trying to use a PickContext to highlight the face of a brep as the mouse moves over it in a custom GetPoint-derived class. The PickContext seems to work for general objects but it doesn’t seem to select subobjects like faces even though I’ve set SubObjectSelectionEnabled on the context. Below is a sample command and I’ve attached a sample model. When you run the TestPickObjects command and move over the surface or text dots they are found and highlighted but when I move over a brep it doesn’t seem to find the face. Any idea on what I am leaving out?
Thanks, Larry
using System.Collections.Generic;
using Rhino;
using Rhino.Commands;
using Rhino.DocObjects;
using Rhino.Input;
using Rhino.Input.Custom;
using Rhino.Geometry;
namespace TestCommands
{
public class PickCompartmentTestCommand : Command
{
/// <summary>
/// Get the name of the command
/// </summary>
public override string EnglishName
{
get { return "TestPickObjects"; }
}
/// <summary>
/// Logic to execute the command
/// </summary>
/// <param name="doc"></param>
/// <param name="mode"></param>
/// <returns></returns>
protected override Result RunCommand(RhinoDoc doc, RunMode mode)
{
GetObjectsWithHighlight getObj = new GetObjectsWithHighlight(doc);
for (; ; )
{
var result = getObj.Get();
if (result == GetResult.Cancel || result == GetResult.Nothing) return Result.Cancel;
if (result == GetResult.Point) break;
}
if (getObj.Result() == GetResult.Point)
{
}
return Result.Success;
}
}
public class GetObjectsWithHighlight : GetPoint
{
RhinoDoc _rhinoDoc = null;
List<ObjRef> _highlightedObjs = new List<ObjRef>();
public GetObjectsWithHighlight(RhinoDoc rhinoDoc)
{
_rhinoDoc = rhinoDoc;
}
/// <summary>
/// Override dynamic drawing to highlight compartments as you move near them.
/// </summary>
/// <param name="e"></param>
protected override void OnDynamicDraw(GetPointDrawEventArgs e)
{
base.OnDynamicDraw(e); // call base class method
if (e.Viewport.Id == View().ActiveViewport.Id)
{
HighlightObjects(e, _highlightedObjs, false);
_highlightedObjs.Clear();
var clientPt = e.Viewport.WorldToClient(e.CurrentPoint);
var pickedObjs = PickObjects(new System.Drawing.Point((int)clientPt.X, (int)clientPt.Y));
HighlightObjects(e, pickedObjs, true);
_highlightedObjs.AddRange(pickedObjs);
}
}
protected void HighlightObjects(GetPointDrawEventArgs e, IList<ObjRef> objects, bool highlight)
{
foreach (var objRef in objects)
{
if (objRef.Brep() != null && !objRef.Brep().IsSurface)
{
if (objRef.GeometryComponentIndex.ComponentIndexType == ComponentIndexType.BrepFace)
objRef.Object().HighlightSubObject(objRef.GeometryComponentIndex, highlight);
else
e.Display.DrawDot(e.CurrentPoint, "No Face Found", System.Drawing.Color.Yellow, System.Drawing.Color.Black);
}
else
objRef.Object().Highlight(highlight);
}
}
/// <summary>
/// Internal helper method to figure out the selected objects
/// </summary>
/// <param name="screenPt"></param>
/// <returns>The collection of picked object refs</returns>
protected IList<ObjRef> PickObjects(System.Drawing.Point screenPt)
{
PickContext pickContext = new PickContext();
pickContext.View = this.View();
//pickContext.PickMode = PickMode.Shaded;
pickContext.PickMode = PickMode.Wireframe;
pickContext.SubObjectSelectionEnabled = true;
pickContext.PickStyle = PickStyle.PointPick;
var pickTransform = View().ActiveViewport.GetPickTransform(screenPt);
pickContext.SetPickTransform(pickTransform);
View().ActiveViewport.GetFrustumLine(screenPt.X, screenPt.Y, out Line worldLine);
pickContext.PickLine = worldLine;
pickContext.UpdateClippingPlanes();
return _rhinoDoc.Objects.PickObjects(pickContext);
}
}
}
TestPickModel.3dm (168.6 KB)
