/**
* Create the VBO for the triangles
* */
void CreateTrianglesVBO()
{
trianglesVBO.Invalidate();
List <RenderVertex> renderVertices = new List <RenderVertex>();
for (int triangleIndex = 0; triangleIndex < mesh.GetNumberOfTriangles(); triangleIndex++)
{
Triangle t = mesh.GetTriangle(triangleIndex);
for (int vertexIndex = 0; vertexIndex < 3; vertexIndex++)
{
Vector3 pos = mesh.GetVertex(t.GetVertexIndex(vertexIndex));
Vector2 textCoords = mesh.GetTextureCoordinate(t.GetTexCoordIndex(vertexIndex));
renderVertices.Add(new RenderVertex(pos, t.Normal, color, textCoords));
}
}
trianglesVBO.Setup(renderVertices, PrimitiveType.Triangles);
}
public static ITriangleMesh Snap(ITriangleMesh mesh, float epsilon)
{
Dictionary <int, int> vertexMapping = new Dictionary <int, int>();
ITriangleMesh result = new TriangleMesh();
for (int i = 0; i < mesh.GetNumberOfVertices(); i++)
{
Vector3 vi = mesh.GetVertex(i);
bool found = false;
for (int j = 0; j < result.GetNumberOfVertices(); j++)
{
Vector3 vj = result.GetVertex(j);
if (Vector3.Subtract(vi, vj).Length < epsilon)
{
vertexMapping[i] = j;
found = true;
}
}
if (!found)
{
int idx = result.AddVertex(vi);
vertexMapping[i] = idx;
}
}
for (int i = 0; i < mesh.GetNumberOfTexCoords(); i++)
{
result.AddTextureCoordinate(mesh.GetTextureCoordinate(i));
}
for (int i = 0; i < mesh.GetNumberOfTriangles(); i++)
{
Triangle t = mesh.GetTriangle(i).Clone();
t.A = vertexMapping[t.A];
t.B = vertexMapping[t.B];
t.C = vertexMapping[t.C];
result.AddTriangle(t);
}
Console.WriteLine("Mesh snapping: " + mesh.GetNumberOfVertices() + " -> " + result.GetNumberOfVertices() + " verts.");
return(result);
}
/**
* Generated the unification of two meshes. Attention: no new mesh is generated, in fact the
* geometry of mesh2 is added to mesh1.
*/
public static void Unite(ITriangleMesh mesh1, ITriangleMesh mesh2)
{
int numberOfVertsMesh1 = mesh1.GetNumberOfVertices();
int numberOfTexCoordsMesh1 = mesh1.GetNumberOfTexCoords();
for (int i = 0; i < mesh2.GetNumberOfVertices(); i++)
{
mesh1.AddVertex(mesh2.GetVertex(i));
}
for (int i = 0; i < mesh2.GetNumberOfTexCoords(); i++)
{
mesh1.AddTextureCoordinate(mesh2.GetTextureCoordinate(i));
}
for (int i = 0; i < mesh2.GetNumberOfTriangles(); i++)
{
Triangle t = mesh2.GetTriangle(i).Clone();
t.VertexIndexOffset(numberOfVertsMesh1);
t.TexCoordsIndexOffset(numberOfTexCoordsMesh1);
mesh1.AddTriangle(t);
}
mesh1.ComputeTriangleNormals();
}