public Slice(TriangleMesh mesh, Plane plane)
{
//GL.Disable(EnableCap.Lighting);
//GL.LineWidth(2);
//GL.Begin(PrimitiveType.Lines);
//float height = 0;
// Slice at 3 levels and combine all segments - this obviates dealing with triangles that are exactly on the plane.
for (int i = -1; i <= 1; i++)
{
Vector3 offset = plane.Normal * 0.0001f * (float)i;
LineHandler lineHandler = new LineHandler(0.0f);
Plane testPlane = new Plane(plane.Normal, plane.Point + offset);
foreach (Triangle t in mesh.Triangles)
{
var intersect = new TrianglePlaneIntersect(t, testPlane);
if (intersect.Intersects)
{
lineHandler.AddSegment(intersect.PointA, intersect.PointB);
//GL.Color3(Color.Blue);
//GL.Vertex3(intersect.PointA + new Vector3(0, 0, height + .01f));
//GL.Color3(Color.Red);
//GL.Vertex3(intersect.PointB + new Vector3(0, 0, height + .01f));
}
else if (intersect.all_intersect && Vector3.Dot(t.Plane.Normal, testPlane.Normal) > 0.5f)
{
// Entire triangle intersects
// Add all the triangle edges (TODO: clean this up...)
List<Vector3> vertices = new List<Vector3>(t.Vertices);
for (int a = 0; a < 3; a++)
{
Vector3 v1 = vertices[a];
Vector3 v2 = vertices[(a + 1) % 3];
lineHandler.AddSegment(v1, v2);
}
}
}
if (this.polyTree == null)
{
Init(lineHandler.GetOuterLoops(), plane);
}
else
{
Slice s = new Slice(lineHandler.GetOuterLoops(), plane);
this.Union(s);
}
}
//GL.End();
//GL.Enable(EnableCap.Lighting);
//GL.LineWidth(1);
}
public Slice(TriangleMesh mesh, Plane plane)
{
//GL.Disable(EnableCap.Lighting);
//GL.LineWidth(2);
//GL.Begin(PrimitiveType.Lines);
//float height = 0;
// Slice at 3 levels and combine all segments - this obviates dealing with triangles that are exactly on the plane.
for (int i = -1; i <= 1; i++)
{
Vector3 offset = plane.Normal * 0.0001f * (float)i;
LineHandler lineHandler = new LineHandler(0.0f);
Plane testPlane = new Plane(plane.Normal, plane.Point + offset);
foreach (Triangle t in mesh.Triangles)
{
var intersect = new TrianglePlaneIntersect(t, testPlane);
if (intersect.Intersects)
{
lineHandler.AddSegment(intersect.PointA, intersect.PointB);
//GL.Color3(Color.Blue);
//GL.Vertex3(intersect.PointA + new Vector3(0, 0, height + .01f));
//GL.Color3(Color.Red);
//GL.Vertex3(intersect.PointB + new Vector3(0, 0, height + .01f));
}
else if (intersect.all_intersect && Vector3.Dot(t.Plane.Normal, testPlane.Normal) > 0.5f)
{
// Entire triangle intersects
// Add all the triangle edges (TODO: clean this up...)
List <Vector3> vertices = new List <Vector3>(t.Vertices);
for (int a = 0; a < 3; a++)
{
Vector3 v1 = vertices[a];
Vector3 v2 = vertices[(a + 1) % 3];
lineHandler.AddSegment(v1, v2);
}
}
}
if (this.polyTree == null)
{
Init(lineHandler.GetOuterLoops(), plane);
}
else
{
Slice s = new Slice(lineHandler.GetOuterLoops(), plane);
this.Union(s);
}
}
//GL.End();
//GL.Enable(EnableCap.Lighting);
//GL.LineWidth(1);
}
