public void AddContour(ContourVertex[] vertices, ContourOrientation forceOrientation)
{
if (_mesh == null)
{
_mesh = new Mesh();
}
bool reverse = false;
if (forceOrientation != ContourOrientation.Original)
{
float area = SignedArea(vertices);
reverse = (forceOrientation == ContourOrientation.Clockwise && area < 0.0f) || (forceOrientation == ContourOrientation.CounterClockwise && area > 0.0f);
}
MeshUtils.Edge e = null;
for (int i = 0; i < vertices.Length; ++i)
{
if (e == null)
{
e = _mesh.MakeEdge();
_mesh.Splice(e, e._Sym);
}
else
{
// Create a new vertex and edge which immediately follow e
// in the ordering around the left face.
_mesh.SplitEdge(e);
e = e._Lnext;
}
int index = reverse ? vertices.Length - 1 - i : i;
// The new vertex is now e._Org.
e._Org._coords = vertices[index].Position;
e._Org._data = vertices[index].Data;
// The winding of an edge says how the winding number changes as we
// cross from the edge's right face to its left face. We add the
// vertices in such an order that a CCW contour will add +1 to
// the winding number of the region inside the contour.
e._winding = 1;
e._Sym._winding = -1;
}
}
public void Tessellate(WindingRule windingRule, ElementType elementType, int polySize, CombineCallback combineCallback)
{
_vertices = null;
_elements = null;
_windingRule = windingRule;
_combineCallback = combineCallback;
if (_mesh == null)
{
return;
}
// Determine the polygon normal and project vertices onto the plane
// of the polygon.
ProjectPolygon();
// ComputeInterior computes the planar arrangement specified
// by the given contours, and further subdivides this arrangement
// into regions. Each region is marked "inside" if it belongs
// to the polygon, according to the rule given by windingRule.
// Each interior region is guaranteed be monotone.
ComputeInterior();
// If the user wants only the boundary contours, we throw away all edges
// except those which separate the interior from the exterior.
// Otherwise we tessellate all the regions marked "inside".
if (elementType == ElementType.BoundaryContours)
{
SetWindingNumber(1, true);
}
else
{
TessellateInterior();
}
_mesh.Check();
if (elementType == ElementType.BoundaryContours)
{
OutputContours();
}
else
{
OutputPolymesh(elementType, polySize);
}
_mesh = null;
}
public Tess()
{
_normal = Vec3.Zero;
_bminX = _bminY = _bmaxX = _bmaxY = 0.0f;
_windingRule = WindingRule.EvenOdd;
_mesh = null;
_vertices = null;
_vertexCount = 0;
_elements = null;
_elementCount = 0;
}