/// <summary>
/// Tessellate the topography.
/// </summary>
/// <param name="mesh">The mesh into which the topography's facets will be added.</param>
public void Tessellate(ref Mesh mesh)
{
foreach (var t in this._mesh.Triangles)
{
var c = this._colorizer(t);
t.Vertices[0].Color = c;
t.Vertices[1].Color = c;
t.Vertices[2].Color = c;
}
mesh.AddMesh(this._mesh);
}
/// <summary>
/// Create a topography from a custom mesh. It is assumed that the mesh is an open mesh that's roughly parallel to the XY plane.
/// </summary>
/// <param name="mesh">The mesh geometry of the topography.</param>
/// <param name="material">The topography's material.</param>
/// <param name="transform">The topography's transform.</param>
/// <param name="id">The topography's id.</param>
/// <param name="name">The topography's name.</param>
/// <returns></returns>
public Topography(Mesh mesh, Material material, Transform transform, Guid id, string name) : base(material,
transform,
false,
id,
name)
{
var newMesh = new Mesh(mesh);
var bbox = new BBox3(mesh.Vertices.Select(v => v.Position));
this._minElevation = bbox.Min.Z;
this._maxElevation = bbox.Max.Z;
double absoluteMinimumElevation = this.AbsoluteMinimumElevation ?? this.MinElevation - this.DepthBelowMinimumElevation;
var nakedBoundaries = mesh.GetNakedBoundaries();
var basePlane = new Plane((0, 0, absoluteMinimumElevation), (0, 0, 1));
foreach (var polygon in nakedBoundaries)
{
// construct bottom
var bottomPolygon = polygon.Project(basePlane);
var tess = new Tess
{
NoEmptyPolygons = true
};
tess.AddContour(bottomPolygon.Reversed().ToContourVertexArray());
tess.Tessellate(WindingRule.Positive, ElementType.Polygons, 3);
var faceMesh = tess.ToMesh(normal: (0, 0, -1));
this._baseVerts = new List <Vertex>(faceMesh.Vertices);
newMesh.AddMesh(faceMesh);
// construct sides
var upperSegments = polygon.Segments();
var lowerSegments = bottomPolygon.Segments();
for (int i = 0; i < upperSegments.Count(); i++)
{
var topEdge = upperSegments[i];
var bottomEdge = lowerSegments[i];
var normal = topEdge.Direction().Cross(Vector3.ZAxis).Unitized();
var a = newMesh.AddVertex(topEdge.Start, normal: normal);
var b = newMesh.AddVertex(topEdge.End, normal: normal);
var c = newMesh.AddVertex(bottomEdge.End, normal: normal);
var d = newMesh.AddVertex(bottomEdge.Start, normal: normal);
newMesh.AddTriangle(a, c, b);
newMesh.AddTriangle(a, d, c);
}
}
this.Mesh = newMesh;
}
/// <summary>
/// Tessellate the topography.
/// </summary>
/// <param name="mesh">The mesh into which the topography's facets will be added.</param>
public void Tessellate(ref Mesh mesh)
{
mesh.AddMesh(this._mesh);
}
