bool _snip(int u, int v, int w, int n, int [] V)
{
int p;
Point3DF A = Points[V[u]];
Point3DF B = Points[V[v]];
Point3DF C = Points[V[w]];
if (C_EPSILON > (((B.X - A.X) * (C.Y - A.Y)) - ((B.Y - A.Y) * (C.x - A.x))))
{
return(false);
}
for (p = 0; p < n; p++)
{
if ((p == u) || (p == v) || (p == w))
{
continue;
}
Point3DF P = Points.get(V[p]);
if (_insideTriangle(A, B, C, P))
{
return(false);
}
}
return(true);
}
//
public MeshIndexed()
{
this.Vertices = new List <Vector3Ext>();
this.Polygons = new List <GlPolyIndex>();
this.Attributes = new Attributes();
this.DisplayScale = 1.0f;
this.Rotation = new Point3DF(0, 0, 0);
}
public void Translate(Point3DF translation)
{
for (int j = 0; j < Points.Count; j++)
{
Points[j].X += translation.X;
Points[j].Y += translation.Y;
Points[j].Z += translation.Z;
}
}
public void Scale(Point3DF scale)
{
for (int j = 0; j < Points.Count; j++)
{
Points[j].X *= scale.X;
Points[j].Y *= scale.Y;
Points[j].Z *= scale.Z;
}
}
public Point3DF Scale(Point3DF scale)
{
Point3DF result = new Point3DF();
result.X = this.X * scale.X;
result.Y = this.Y * scale.Y;
result.Z = this.Z * scale.Z;
return(result);
}
public Point3DF Scale(float scaleX, float scaleY, float scaleZ)
{
Point3DF result = new Point3DF();
result.X = this.X * scaleX;
result.Y = this.Y * scaleY;
result.Z = this.Z * scaleZ;
return(result);
}
public Matrix4 CalculateRotation(Point3DF rotation)
{
Matrix4 rotX = Matrix4.CreateRotationX(rotation.X);
Matrix4 rotY = Matrix4.CreateRotationY(rotation.Y);
Matrix4 rotZ = Matrix4.CreateRotationZ(rotation.Z);
Matrix4.Mult(ref rotX, ref rotY, out rotationMatrix);
return(Matrix4.Mult(rotationMatrix, rotZ));
}
public Vector3 Mult(ref Matrix4 matrix, Point3DF vector)
{
Vector3 result = new Vector3();
result.X = matrix.M11 * vector.X + matrix.M12 * vector.Y + matrix.M13 * vector.Z;
result.Y = matrix.M21 * vector.X + matrix.M22 * vector.Y + matrix.M23 * vector.Z;
result.Z = matrix.M31 * vector.X + matrix.M32 * vector.Y + matrix.M33 * vector.Z;
return(result);
}
///
/// Returns the area of the contour
///
float _area()
{
int n = Points.Count;
float A = 0.0f;
for (int p = n - 1, q = 0; q < n; p = q++)
{
Point3DF pval = Points[p];
Point3DF qval = Points[q];
A += pval.X * qval.Y - qval.X * pval.Y;
}
return(A * 0.5f);
}
// 3d shapes
public static MeshIndexed MakeCube(float x, float y, float z, Color color)
{
MeshIndexed result = new MeshIndexed();
Point3DF[] points = new Point3DF[8];
// create vertexes
points[0] = new Point3DF(0, 0, 0);
points[1] = new Point3DF(0, y, 0);
points[2] = new Point3DF(x, y, 0);
points[3] = new Point3DF(x, 0, 0);
points[4] = new Point3DF(0, 0, z);
points[5] = new Point3DF(0, y, z);
points[6] = new Point3DF(x, y, z);
points[7] = new Point3DF(x, 0, z);
foreach (Point3DF point in points)
{
result.Vertices.Add(new Vector3Ext(point));
}
// base
result.AddFacet(new Facet(points[0], points[3], points[2]), color);
result.AddFacet(new Facet(points[2], points[1], points[0]), color);
// sides
result.AddFacet(new Facet(points[0], points[4], points[3]), color);
result.AddFacet(new Facet(points[3], points[4], points[7]), color);
result.AddFacet(new Facet(points[0], points[1], points[5]), color);
result.AddFacet(new Facet(points[5], points[4], points[0]), color);
result.AddFacet(new Facet(points[2], points[6], points[5]), color);
result.AddFacet(new Facet(points[5], points[1], points[2]), color);
result.AddFacet(new Facet(points[7], points[6], points[2]), color);
result.AddFacet(new Facet(points[2], points[3], points[7]), color);
// top
result.AddFacet(new Facet(points[4], points[5], points[6]), color);
result.AddFacet(new Facet(points[6], points[7], points[4]), color);
result.Translate(-x / 2, -y / 2, 0);
return(result);
}
//
public Vector3Ext(Point3DF point)
{
this.Attributes = new Attributes();
this.Position = new Vector3(point.X, point.Y, point.Z);
}
public Facet(Point3DF p1, Point3DF p2, Point3DF p3)
{
Points = new Point3DF[3] {
p1, p2, p3
};
}
