public static void DrawOutline(IGraphicsContainer3D outlineGraphicsContainer3D, IGeometry geometry)
{
const esriSimple3DLineStyle OutlineStyle = esriSimple3DLineStyle.esriS3DLSTube;
const double OutlineWidth = 0.1;
const int Black_R = 0;
const int Black_G = 0;
const int Black_B = 0;
IColor outlineColor = ColorUtilities.GetColor(Black_R, Black_G, Black_B);
outlineGraphicsContainer3D.DeleteAllElements();
GraphicsLayer3DUtilities.AddOutlineToGraphicsLayer3D(outlineGraphicsContainer3D, GeometryUtilities.ConstructMultiPatchOutline(geometry), outlineColor, OutlineStyle, OutlineWidth);
}