public Mesh(VertexBuffer vertexBuffer, IndexBuffer indexBuffer,
BeginMode mode = BeginMode.Triangles)
{
_vertexBuffer = vertexBuffer;
_indexBuffer = indexBuffer;
_renderingMode = mode;
}
private Mesh GetBondMesh()
{
if (_bond != null)
return _bond;
Console.Write("Generating bond mesh... ");
// http://in.answers.yahoo.com/question/index?qid=20060907224537AA8MBBH
const float sqrt3over2 = 0.86602540378f;
const float sqrt3over4 = sqrt3over2 / 2;
List<Vector3> vertices = new List<Vector3>(){
new Vector3(0, 0, 0),
new Vector3(1, 0, 0),
new Vector3(0.5F, sqrt3over2, 0),
new Vector3(0, 0, 1),
new Vector3(1, 0, 1),
new Vector3(0.5F, sqrt3over2, 1)
};
List<int> indices = new List<int>(){
2, 5, 4, 1,
3, 5, 2, 0,
1, 4, 3, 0,
0, 2, 1, 0/*, //this and next line are the end caps
3, 4, 5, 3*/
};
Vector3 OFFSET = new Vector3(0.25F, sqrt3over4, 0);
//Vector3 vertex;
//std.Transformation(vertices[0], vertices[vertices.Count-1], vertices[0], out vertex);
//vertex -= OFFSET;
/*
std::transform(vertices.begin(), vertices.end(), vertices.begin(),
[&](const glm::vec3& vertex)
{
return vertex - OFFSET;
}
);
*/
var vBuffer = new VertexBuffer(vertices);
var iBuffer = new IndexBuffer(indices, BeginMode.TriangleStrip); // quads
_bond = new Mesh(vBuffer, iBuffer, BeginMode.TriangleStrip); // quads
Console.WriteLine("done. Cached the result.");
return _bond;
}
private Mesh GetAtomMesh()
{
if (_atom != null)
return _atom;
Console.Write("Generating atom mesh... ");
//adapted from sandy_bence's 2005 post over at:
//http://www.gamedev.net/topic/350823-rendering-a-sphere-using-triangle-strips/
List<Vector3> vertices = new List<Vector3>();
for (uint stack = 0; stack <= ATOM_STACKS; stack++)
{
for (uint slice = 0; slice < ATOM_SLICES; slice++)
{
float theta = stack * PI / ATOM_STACKS;
float phi = slice * 2 * PI / ATOM_SLICES;
float sinTheta = (float)Math.Sin(theta);
float cosTheta = (float)Math.Cos(theta);
float sinPhi = (float)Math.Sin(phi);
float cosPhi = (float)Math.Cos(phi);
vertices.Add(new Vector3(
cosPhi * sinTheta,
sinPhi * sinTheta,
cosTheta
));
}
}
List<int> indices = new List<int>();
for (uint stack = 0; stack < ATOM_STACKS; stack++)
{
for (uint slice = 0; slice <= ATOM_SLICES; slice++)
{
var sliceMod = slice % ATOM_SLICES;
indices.Add((int)((stack * ATOM_SLICES) + sliceMod));
indices.Add((int)(((stack + 1) * ATOM_SLICES) + sliceMod));
}
}
var vBuffer = new VertexBuffer(vertices);
var iBuffer = new IndexBuffer(indices, BeginMode.TriangleStrip);
_atom = new Mesh(vBuffer, iBuffer, BeginMode.TriangleStrip);
Console.WriteLine("done. Cached the result.");
return _atom;
}