private static void Subdivide(IList<Vector3D> positions, IndicesUnsignedInt indices, TriangleIndicesUnsignedInt triangle, int level)
{
if (level > 0)
{
positions.Add(((positions[triangle.I0] + positions[triangle.I1]) * 0.5).Normalize());
positions.Add(((positions[triangle.I1] + positions[triangle.I2]) * 0.5).Normalize());
positions.Add(((positions[triangle.I2] + positions[triangle.I0]) * 0.5).Normalize());
int i01 = positions.Count - 3;
int i12 = positions.Count - 2;
int i20 = positions.Count - 1;
//
// Subdivide input triangle into four triangles
//
--level;
Subdivide(positions, indices, new TriangleIndicesUnsignedInt(triangle.I0, i01, i20), level);
Subdivide(positions, indices, new TriangleIndicesUnsignedInt(i01, triangle.I1, i12), level);
Subdivide(positions, indices, new TriangleIndicesUnsignedInt(i01, i12, i20), level);
Subdivide(positions, indices, new TriangleIndicesUnsignedInt(i20, i12, triangle.I2), level);
}
else
{
indices.AddTriangle(triangle);
}
}
public void TriangleIndicesTest()
{
TriangleIndicesUnsignedInt triangle = new TriangleIndicesUnsignedInt(0, 1, 2);
Assert.AreEqual(0, triangle.UI0);
Assert.AreEqual(1, triangle.UI1);
Assert.AreEqual(2, triangle.UI2);
TriangleIndicesUnsignedInt triangle2 = triangle;
Assert.AreEqual(triangle, triangle2);
TriangleIndicesUnsignedInt triangle3 = new TriangleIndicesUnsignedInt(3, 4, 5);
Assert.AreNotEqual(triangle, triangle3);
}
public void AddTriangle(TriangleIndicesUnsignedInt triangle)
{
_values.Add(triangle.UI0);
_values.Add(triangle.UI1);
_values.Add(triangle.UI2);
}
private static void Subdivide(SubdivisionMesh subdivisionMesh, TriangleIndicesUnsignedInt triangle, int level)
{
if (level > 0)
{
IList<Vector3D> positions = subdivisionMesh.Positions;
Vector3D n01 = ((positions[triangle.I0] + positions[triangle.I1]) * 0.5).Normalize();
Vector3D n12 = ((positions[triangle.I1] + positions[triangle.I2]) * 0.5).Normalize();
Vector3D n20 = ((positions[triangle.I2] + positions[triangle.I0]) * 0.5).Normalize();
Vector3D p01 = n01.MultiplyComponents(subdivisionMesh.Ellipsoid.Radii);
Vector3D p12 = n12.MultiplyComponents(subdivisionMesh.Ellipsoid.Radii);
Vector3D p20 = n20.MultiplyComponents(subdivisionMesh.Ellipsoid.Radii);
positions.Add(p01);
positions.Add(p12);
positions.Add(p20);
int i01 = positions.Count - 3;
int i12 = positions.Count - 2;
int i20 = positions.Count - 1;
if ((subdivisionMesh.Normals != null) || (subdivisionMesh.TextureCoordinate != null))
{
Vector3D d01 = subdivisionMesh.Ellipsoid.GeodeticSurfaceNormal(p01);
Vector3D d12 = subdivisionMesh.Ellipsoid.GeodeticSurfaceNormal(p12);
Vector3D d20 = subdivisionMesh.Ellipsoid.GeodeticSurfaceNormal(p20);
if (subdivisionMesh.Normals != null)
{
subdivisionMesh.Normals.Add(d01.ToVector3H());
subdivisionMesh.Normals.Add(d12.ToVector3H());
subdivisionMesh.Normals.Add(d20.ToVector3H());
}
if (subdivisionMesh.TextureCoordinate != null)
{
subdivisionMesh.TextureCoordinate.Add(SubdivisionUtility.ComputeTextureCoordinate(d01));
subdivisionMesh.TextureCoordinate.Add(SubdivisionUtility.ComputeTextureCoordinate(d12));
subdivisionMesh.TextureCoordinate.Add(SubdivisionUtility.ComputeTextureCoordinate(d20));
}
}
//
// Subdivide input triangle into four triangles
//
--level;
Subdivide(subdivisionMesh, new TriangleIndicesUnsignedInt(triangle.I0, i01, i20), level);
Subdivide(subdivisionMesh, new TriangleIndicesUnsignedInt(i01, triangle.I1, i12), level);
Subdivide(subdivisionMesh, new TriangleIndicesUnsignedInt(i01, i12, i20), level);
Subdivide(subdivisionMesh, new TriangleIndicesUnsignedInt(i20, i12, triangle.I2), level);
}
else
{
subdivisionMesh.Indices.AddTriangle(triangle);
}
}
private static void Subdivide(SubdivisionMesh subdivisionMesh, TriangleIndicesUnsignedInt triangle, int level)
{
if (level > 0)
{
IList<Vector3D> positions = subdivisionMesh.Positions;
Vector3D p01 = ((positions[triangle.I0] + positions[triangle.I1]) * 0.5).Normalize();
Vector3D p12 = ((positions[triangle.I1] + positions[triangle.I2]) * 0.5).Normalize();
Vector3D p20 = ((positions[triangle.I2] + positions[triangle.I0]) * 0.5).Normalize();
positions.Add(p01);
positions.Add(p12);
positions.Add(p20);
int i01 = positions.Count - 3;
int i12 = positions.Count - 2;
int i20 = positions.Count - 1;
if (subdivisionMesh.Normals != null)
{
subdivisionMesh.Normals.Add(p01.ToVector3H());
subdivisionMesh.Normals.Add(p12.ToVector3H());
subdivisionMesh.Normals.Add(p20.ToVector3H());
}
if (subdivisionMesh.TextureCoordinate != null)
{
subdivisionMesh.TextureCoordinate.Add(SubdivisionUtility.ComputeTextureCoordinate(p01));
subdivisionMesh.TextureCoordinate.Add(SubdivisionUtility.ComputeTextureCoordinate(p12));
subdivisionMesh.TextureCoordinate.Add(SubdivisionUtility.ComputeTextureCoordinate(p20));
}
//
// Subdivide input triangle into four triangles
//
--level;
Subdivide(subdivisionMesh, new TriangleIndicesUnsignedInt(triangle.I0, i01, i20), level);
Subdivide(subdivisionMesh, new TriangleIndicesUnsignedInt(i01, triangle.I1, i12), level);
Subdivide(subdivisionMesh, new TriangleIndicesUnsignedInt(i01, i12, i20), level);
Subdivide(subdivisionMesh, new TriangleIndicesUnsignedInt(i20, i12, triangle.I2), level);
}
else
{
subdivisionMesh.Indices.AddTriangle(triangle);
}
}
