A ProEssentials v10 WPF .NET 8 demonstration of 3D Delaunay triangulation using Pe3doWpf — the ProEssentials 3D scientific graph object. Loads the same 70-point acoustic survey data as example 147 but renders it as an interactive rotating 3D heightmap surface rather than a 2D contour fill.
70 scattered hand-held sound meter readings (Q/N vs PC vs dBA) triangulated into a 3D surface mesh where dBA drives both height and contour color. The floor of the scene shows a projected 2D contour for plan-view reference — giving you both the 3D spatial shape and the familiar 2D contour map at the same time.
This example and example 147 use the same 70-point dataset and the same color scale — the difference is the chart object and rendering dimension:
| Feature | Example 147 | Example 414 (this repo) |
|---|---|---|
| Chart object | PesgoWpf (Scientific Graph) | Pe3doWpf (3D Scientific Graph) |
| Output | 2D filled contour map | 3D rotating heightmap surface |
| Plotting method | SGraphPlottingMethod.ContourDelaunay |
PePlot.Option.Delaunay3D = true + ThreeDGraphPlottingMethod.Four |
| Value axis | Z (contour color only) | Y (both height and contour color) |
| Column mapping | X / Y / Z | X / Z / Y (Y and Z swapped) |
| Bottom projection | — | ShowContour.BottomColors |
| Interaction | Zoom + pan | Rotate + zoom + pan + light drag |
Pe3do1.PePlot.Option.Delaunay3D = true;
Pe3do1.PePlot.Method = ThreeDGraphPlottingMethod.Four; // Surface With ContourDelaunay3D is a boolean flag on the default surface mode — it is not a
separate PolyMode. Set it before the plotting method.
ThreeDGraphPlottingMethod.Four renders the triangulated mesh as a solid
colored surface with contour bands overlaid.
Pe3do1.PeData.Subsets = 1; // always 1 for Delaunay3D
Pe3do1.PeData.Points = 70;
// Column mapping (note swap of Y and Z compared to example 147):
float fX = float.Parse(columns[0], ...); // Q/N — horizontal X axis
float fZ = float.Parse(columns[1], ...); // PC — depth axis
float fY = float.Parse(columns[2], ...); // dBA — HEIGHT (the value axis)
Pe3do1.PeData.X[0, p] = fX;
Pe3do1.PeData.Y[0, p] = fY; // Y is always height in Pe3do
Pe3do1.PeData.Z[0, p] = fZ;In Pe3do, Y is always the vertical/height axis. Loading dBA into Y means the surface elevation directly represents sound level — the taller the peak, the louder the reading.
Pe3do1.PeAnnotation.Graph.X[p] = fX;
Pe3do1.PeAnnotation.Graph.Y[p] = fY;
Pe3do1.PeAnnotation.Graph.Z[p] = fZ; // Z coordinate needed in 3D space
Pe3do1.PeAnnotation.Graph.Type[p] = (int)GraphAnnotationType.SmallDotSolid;
Pe3do1.PeAnnotation.Graph.Text[p] = string.Format("{0:##0.0}", fY);3D annotations require X, Y, and Z coordinates — unlike 2D annotations in example 147 which only need X and Y. The text labels float in 3D space at each measurement location and rotate with the surface.
Pe3do1.PeAnnotation.Graph.LeftJustificationOutside = true; // smart label placement
Pe3do1.PeAnnotation.Graph.SymbolObstacles = true; // avoid overlaps
Pe3do1.PeAnnotation.Graph.AnnotationTextFixedSize = true; // consistent size at all zoom levels// Pe3do — uses PePlot.Option:
Pe3do1.PePlot.Option.ManualContourScaleControl = ManualScaleControl.MinMax;
Pe3do1.PePlot.Option.ManualContourMin = 80.0F;
Pe3do1.PePlot.Option.ManualContourMax = 102.0F;
// Pesgo — uses PeGrid.Configure (different path, same intent):
// Pesgo1.PeGrid.Configure.ManualScaleControlZ = ManualScaleControl.MinMax;This is a key API difference between Pe3do and Pesgo for contour range control.
Pe3do1.PePlot.Option.ShowContour = ShowContour.BottomColors;Projects a colored 2D contour onto the floor of the 3D scene. This gives a plan-view reference as you rotate the surface — you can see both the 3D shape and the 2D spatial distribution simultaneously.
Pe3do1.PePlot.Option.DxZoom = .3F; // camera distance
Pe3do1.PeUserInterface.Scrollbar.ViewingHeight = 26; // vertical tilt
Pe3do1.PeUserInterface.Scrollbar.DegreeOfRotation = 180; // initial rotation
Pe3do1.PeGrid.Option.GridAspectY = .5F; // compress Y scale
Pe3do1.PeFunction.SetLight(0, -9.0F, -3.2F, 1.0F);
Pe3do1.PePlot.Option.LightStrength = .35F;// Pe3do requires all three — in this order:
Pe3do1.PeFunction.Force3dxVerticeRebuild = true;
Pe3do1.PeFunction.Force3dxAnnotVerticeRebuild = true; // required when annotations present
Pe3do1.PeFunction.ReinitializeResetImage();
Pe3do1.Invalidate();
Pe3do1.Refresh(); // Pe3do often needs explicit Refresh()Force3dxAnnotVerticeRebuild is required in addition to Force3dxVerticeRebuild
whenever 3D graph annotations are present.
DelaunaySample.txt — 70 lines, space-delimited, three columns per line.
Column mapping for Pe3do (differs from example 147):
| Column | Maps to | Meaning |
|---|---|---|
| 1 | X | Q/N — flow coefficient |
| 2 | Z | PC — pressure coefficient (depth axis) |
| 3 | Y | dBA — sound level (height axis) |
Copied to the output directory automatically on build.
| Input | Action |
|---|---|
| Left-click drag | Rotate |
| Left-click drag + Shift | Pan / translate |
| Mouse wheel | Zoom in / out |
| Middle-button drag | Rotate light source |
| Double-click | Start / stop auto-rotation |
| Right-click | Context menu — export, print, customize, annotations |
- Visual Studio 2022
- .NET 8 SDK
- Internet connection for NuGet restore
1. Clone this repository
2. Open DelaunayHeightmap.sln in Visual Studio 2022
3. Build → Rebuild Solution (NuGet restore is automatic)
4. Press F5
References
ProEssentials.Chart.Net80.x64.Wpf.
Package restore is automatic on build.
- WPF Delaunay 2D Contour — Example 147
- WPF Heatmap Spectrogram — Grid-Based Contour
- WPF Quickstart — Simple Scientific Graph
- 3D Realtime Surface — ComputeShader
- All Examples — GigasoftInc on GitHub
- Full Evaluation Download
- gigasoft.com
Example code is MIT licensed. ProEssentials requires a commercial license for continued use.