A
TinTriangle is one of the three basic elements of a TIN. Triangles are comprised of three
TinNodes and
TinEdges. Nodes and edges are oriented in clockwise direction.
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Access TIN Elements By Index
using (ArcGIS.Core.Data.Analyst3D.TinNode node = tinDataset.GetNodeByIndex(23))
{
}
using (ArcGIS.Core.Data.Analyst3D.TinEdge edge = tinDataset.GetEdgeByIndex(45))
{
}
using (ArcGIS.Core.Data.Analyst3D.TinTriangle triangle = tinDataset.GetTriangleByIndex(22))
{
}
Search for TIN Triangles
// search all triangles
using (ArcGIS.Core.Data.Analyst3D.TinTriangleCursor triangleCursor = tinDataset.SearchTriangles(null))
{
while (triangleCursor.MoveNext())
{
using (ArcGIS.Core.Data.Analyst3D.TinTriangle triangle = triangleCursor.Current)
{
}
}
}
// search within an extent
ArcGIS.Core.Data.Analyst3D.TinTriangleFilter triangleFilter = new ArcGIS.Core.Data.Analyst3D.TinTriangleFilter();
triangleFilter.FilterEnvelope = envelope;
using (ArcGIS.Core.Data.Analyst3D.TinTriangleCursor triangleCursor = tinDataset.SearchTriangles(triangleFilter))
{
while (triangleCursor.MoveNext())
{
using (ArcGIS.Core.Data.Analyst3D.TinTriangle triangle = triangleCursor.Current)
{
}
}
}
// search all "inside" triangles
triangleFilter = new ArcGIS.Core.Data.Analyst3D.TinTriangleFilter();
triangleFilter.FilterType = ArcGIS.Core.Data.Analyst3D.TinFilterType.InsideDataArea;
using (ArcGIS.Core.Data.Analyst3D.TinTriangleCursor triangleCursor = tinDataset.SearchTriangles(triangleFilter))
{
while (triangleCursor.MoveNext())
{
using (ArcGIS.Core.Data.Analyst3D.TinTriangle triangle = triangleCursor.Current)
{
}
}
}
TIN Triangles
// nodes, edges of the triangle
var triNnodes = triangle.Nodes;
var triEdges = triangle.Edges;
// triangle geometry
var polygon = triangle.ToPolygon();
// triangle length
var triLength = triangle.Length;
// triangle area
var triArea = triangle.Area;
// is the triangle "inside"
var isInsideTriangle = triangle.IsInsideDataArea;
// triangle aspect and slope (radians)
var aspect = triangle.Aspect;
var slope = triangle.Slope;
// get centroid
var centroid = triangle.GetCentroid();
// get normal
var normal = triangle.GetNormal();
// get adjacent triangles
var adjTriangles = triangle.GetAdjacentTriangles();
// get area of triangle that falls between the z values
double minZ = 1.0;
double maxZ = 3.0;
IReadOnlyList<Coordinate3D> coords = triangle.GetPointsBetweenZs(minZ, maxZ);
Seach for TIN Nodes, Edges, Triangles
// search all "inside" nodes
using (ArcGIS.Core.Data.Analyst3D.TinNodeCursor nodeCursor = tinLayer.SearchNodes(null))
{
while (nodeCursor.MoveNext())
{
using (ArcGIS.Core.Data.Analyst3D.TinNode node = nodeCursor.Current)
{
}
}
}
// search "inside" nodes with an extent
ArcGIS.Core.Data.Analyst3D.TinNodeFilter nodeFilter = new ArcGIS.Core.Data.Analyst3D.TinNodeFilter();
nodeFilter.FilterEnvelope = envelope;
using (ArcGIS.Core.Data.Analyst3D.TinNodeCursor nodeCursor = tinLayer.SearchNodes(nodeFilter))
{
while (nodeCursor.MoveNext())
{
using (ArcGIS.Core.Data.Analyst3D.TinNode node = nodeCursor.Current)
{
}
}
}
// search for super nodes only
var supernodeFilter = new ArcGIS.Core.Data.Analyst3D.TinNodeFilter();
supernodeFilter.FilterEnvelope = tinDataset.GetSuperNodeExtent();
supernodeFilter.DataElementsOnly = false;
supernodeFilter.SuperNode = true;
using (ArcGIS.Core.Data.Analyst3D.TinNodeCursor nodeCursor = tinLayer.SearchNodes(nodeFilter))
{
while (nodeCursor.MoveNext())
{
using (ArcGIS.Core.Data.Analyst3D.TinNode node = nodeCursor.Current)
{
}
}
}
// search all edges within an extent
// this could include outside or edges attached to super nodes depending upon the extent
ArcGIS.Core.Data.Analyst3D.TinEdgeFilter edgeFilterAll = new ArcGIS.Core.Data.Analyst3D.TinEdgeFilter();
edgeFilterAll.FilterEnvelope = envelope;
edgeFilterAll.DataElementsOnly = false;
using (ArcGIS.Core.Data.Analyst3D.TinEdgeCursor edgeCursor = tinLayer.SearchEdges(edgeFilterAll))
{
while (edgeCursor.MoveNext())
{
using (ArcGIS.Core.Data.Analyst3D.TinEdge edge = edgeCursor.Current)
{
}
}
}
// search for hard edges in the TIN
var edgeFilter = new ArcGIS.Core.Data.Analyst3D.TinEdgeFilter();
edgeFilter.FilterByEdgeType = true;
edgeFilter.EdgeType = ArcGIS.Core.Data.Analyst3D.TinEdgeType.HardEdge;
using (ArcGIS.Core.Data.Analyst3D.TinEdgeCursor edgeCursor = tinLayer.SearchEdges(edgeFilter))
{
while (edgeCursor.MoveNext())
{
using (ArcGIS.Core.Data.Analyst3D.TinEdge edge = edgeCursor.Current)
{
}
}
}
// search for "inside" triangles in an extent
ArcGIS.Core.Data.Analyst3D.TinTriangleFilter triangleFilter = new ArcGIS.Core.Data.Analyst3D.TinTriangleFilter();
triangleFilter.FilterEnvelope = envelope;
triangleFilter.DataElementsOnly = true;
using (ArcGIS.Core.Data.Analyst3D.TinTriangleCursor triangleCursor = tinLayer.SearchTriangles(triangleFilter))
{
while (triangleCursor.MoveNext())
{
using (ArcGIS.Core.Data.Analyst3D.TinTriangle triangle = triangleCursor.Current)
{
}
}
}
Target Platforms: Windows 11, Windows 10
ArcGIS Pro version: 3.2 or higher.