public static CylinderVisual3DModel Closed2DAreaToCylinderVisual3DModel(List <Point> featurePoints, double upperZValue, double lowerZValue)
{
CylinderVisual3DModel cylinderVisual3D = new CylinderVisual3DModel();
Rect rect = FeaturePointHelper.GetFeaturePointsBoundaryRect(featurePoints);
List <Vertex2D> vertexList = new List <Vertex2D>();
for (int i = 0; i < featurePoints.Count; i++)
{
Vertex2D vertex = new Vertex2D(featurePoints[i])
{
Index = i
};
vertexList.Add(vertex);
}
bool isCw = PolygonTriangulationHelper.IsClockwise(vertexList);
if (!isCw)
{
featurePoints.Reverse();
}
//List<int> trianglePointIndexList = PolygonTriangulationHelper.ResolveToTriangles(vertexList);
List <Vec> vecList = new List <Vec>();
for (int i = 0; i < featurePoints.Count; i++)
{
Vec vec = new Vec {
x = (float)featurePoints[i].X, y = (float)featurePoints[i].Y
};
vecList.Add(vec);
}
List <int> trianglePointIndexList = PolygonHelper.Resolve(vecList);
if (trianglePointIndexList == null)
{
return(null);
}
List <int> lowerUnderSurfacePointIndexList = new List <int>();
for (int i = 0; i < trianglePointIndexList.Count; i = i + 3)
{
lowerUnderSurfacePointIndexList.Add(trianglePointIndexList[i]);
lowerUnderSurfacePointIndexList.Add(trianglePointIndexList[i + 2]);
lowerUnderSurfacePointIndexList.Add(trianglePointIndexList[i + 1]);
}
Geometry3DModel upperGeometry3DModel = FeaturePointsToGeometry3DModel(featurePoints, upperZValue, rect, lowerUnderSurfacePointIndexList);
cylinderVisual3D.UpperUndersurface = upperGeometry3DModel;
Geometry3DModel lowerGeometry3DModel = FeaturePointsToGeometry3DModel(featurePoints, lowerZValue, rect, trianglePointIndexList);
cylinderVisual3D.LowerUndersurface = lowerGeometry3DModel;
cylinderVisual3D.SideSurface = FeaturePointsToSideSurefaceGeometry3DModel(featurePoints, upperZValue, lowerZValue);
return(cylinderVisual3D);
}
private static Geometry3DModel FeaturePointsToGeometry3DModel(IList <Point> featurePoints, double zValue, Rect rect, List <int> trianglePointIndexList)
{
Geometry3DModel geometry3DModel = new Geometry3DModel();
geometry3DModel.TriangleIndices.AddRange(trianglePointIndexList);
List <Point3D> point3DList = ClosedPathPointsToPoint3Ds(featurePoints, zValue);
foreach (Point3D point3D in point3DList)
{
geometry3DModel.Positions.Add(point3D);
double textureCoordinateX = (point3D.X - rect.X) / rect.Width;
double textureCoordinateY = (point3D.Y - rect.Y) / rect.Height;
Point point = new Point(textureCoordinateX, textureCoordinateY);
geometry3DModel.TextureCoordinates.Add(point);
}
return(geometry3DModel);
}
private static Geometry3DModel FeaturePointsToSideSurefaceGeometry3DModel(IList <Point> featurePoints, double upperZValue, double lowerZValue)
{
if (featurePoints == null || featurePoints.Count < 3)
{
throw new Exception("The count of closed path points must large than or equal to 3.");
}
Geometry3DModel geometry3DModel = new Geometry3DModel();
List <Point3D> point3DList = ClosedAreaFeaturePointsToSideSurfacePoint3Ds(featurePoints, upperZValue, lowerZValue);
for (int i = 0; i < point3DList.Count; i++)
{
geometry3DModel.Positions.Add(point3DList[i]);
geometry3DModel.TextureCoordinates.Add(new Point(i / 2.0 / point3DList.Count, i % 2.0 / point3DList.Count));
}
for (int i = 0; i < geometry3DModel.Positions.Count / 2 - 1; i++)
{
int startIndex = i * 2;
geometry3DModel.TriangleIndices.Add(startIndex);
geometry3DModel.TriangleIndices.Add(startIndex + 1);
geometry3DModel.TriangleIndices.Add(startIndex + 3);
geometry3DModel.TriangleIndices.Add(startIndex);
geometry3DModel.TriangleIndices.Add(startIndex + 3);
geometry3DModel.TriangleIndices.Add(startIndex + 2);
}
//连接首尾
geometry3DModel.TriangleIndices.Add(geometry3DModel.Positions.Count - 2);
geometry3DModel.TriangleIndices.Add(geometry3DModel.Positions.Count - 1);
geometry3DModel.TriangleIndices.Add(1);
geometry3DModel.TriangleIndices.Add(geometry3DModel.Positions.Count - 2);
geometry3DModel.TriangleIndices.Add(1);
geometry3DModel.TriangleIndices.Add(0);
return(geometry3DModel);
}
public static MeshGeometry3D CreateGeometry3D(Geometry3DModel geometry3DModel)
{
MeshGeometry3D mesh = new MeshGeometry3D();
if (geometry3DModel == null)
{
return(mesh);
}
if (geometry3DModel.Positions != null)
{
foreach (Point3D point3D in geometry3DModel.Positions)
{
mesh.Positions.Add(point3D);
}
}
if (geometry3DModel.TriangleIndices != null)
{
foreach (int pointIndice in geometry3DModel.TriangleIndices)
{
mesh.TriangleIndices.Add(pointIndice);
}
}
if (geometry3DModel.TextureCoordinates != null)
{
foreach (Point point in geometry3DModel.TextureCoordinates)
{
mesh.TextureCoordinates.Add(point);
}
}
mesh.Freeze();
return(mesh);
}