I am trying to draw a box. I've used the sample code for acquiring a bounding box. When I try to create the box I get complaints that there are no values in the array. Is there a better way to do this?
See the following example code below:
public override IRhinoCommand.result RunCommand(IRhinoCommandContext context) { // Select a curve object MRhinoGetObject go = new MRhinoGetObject(); go.SetCommandPrompt("Select curve"); go.SetGeometryFilter(IRhinoGetObject.GEOMETRY_TYPE_FILTER.curve_object); go.GetObjects(1, 1); if (go.CommandResult() != IRhinoCommand.result.success) return go.CommandResult(); // Validate the selection IRhinoObject obj = go.Object(0).Object(); if (null == obj) return IRhinoCommand.result.failure; // Get the active view MRhinoView view = RhUtil.RhinoApp().ActiveView(); if (null == view) return IRhinoCommand.result.failure; // Get the construction plane from the active view OnPlane plane = new OnPlane(view.ActiveViewport().ConstructionPlane().m_plane); // Create a construction plane aligned bounding box OnBoundingBox bbox = new OnBoundingBox(); IRhinoObject[] objs = new IRhinoObject[1] { obj }; bool rc = RhUtil.RhinoGetTightBoundingBox(objs, ref bbox, false, plane); if (rc == false) return IRhinoCommand.result.failure; // Validate bounding box if (0 != bbox.IsDegenerate()) { RhUtil.RhinoApp().Print("Curve's tight bounding box is degenerate.\n"); return IRhinoCommand.result.nothing; } // ON_BrepBox wants 8 points defining the box corners // arranged in this order: // // v7______________v6 // |\ |\ // | \ | \ // | \ _____________\ // | v4 | v5 // | | | | // | | | | // v3---|---------v2 | // \ | \ | // \ | \ | // \ | \ | // \v0____________\v1 // On3dPoint[] box_corners = new On3dPoint[8]; box_corners[0] = bbox.Corner(0, 0, 0); box_corners[1] = bbox.Corner(1, 0, 0); box_corners[2] = bbox.Corner(1, 1, 0); box_corners[3] = bbox.Corner(0, 1, 0); box_corners[4] = bbox.Corner(0, 0, 1); box_corners[5] = bbox.Corner(1, 0, 1); box_corners[6] = bbox.Corner(1, 1, 1); box_corners[7] = bbox.Corner(0, 1, 1); // Transform points to the world-xy plane OnXform p2w = new OnXform(); p2w.ChangeBasis(plane, OnUtil.On_xy_plane); for (int i = 0; i < 8; i++) box_corners[i].Transform(p2w); // Make a brep box OnBrep brep = OnUtil.ON_BrepBox(box_corners); if (null != brep) { context.m_doc.AddBrepObject(brep); context.m_doc.Redraw(); } return IRhinoCommand.result.success; }