/// <summary>
/// Create a point cube - a set of vertex on each point of a cube
/// </summary>
/// <param name="size">Size of cub</param>
/// <param name="pos">Optional, offset position to place model</param>
/// <returns></returns>
public static Vector4[] CreateVertexPointCube(float size, Vector3?pos = null)
{
size = size / 2f; // halv side - and other half +
Vector4[] vertices =
{
new Vector4(new Vector4(-size, size, size, 1.0f)), // arranged as wound clockwise around top, then around bottom
new Vector4(new Vector4(size, size, size, 1.0f)),
new Vector4(new Vector4(size, size, -size, 1.0f)),
new Vector4(new Vector4(-size, size, -size, 1.0f)),
new Vector4(new Vector4(-size, -size, size, 1.0f)),
new Vector4(new Vector4(size, -size, size, 1.0f)),
new Vector4(new Vector4(size, -size, -size, 1.0f)),
new Vector4(new Vector4(-size, -size, -size, 1.0f)),
};
if (pos != null)
{
GLStaticsVector4.Translate(ref vertices, pos.Value);
}
return(vertices);
}
/// <summary>
/// Sphere in triangles
/// </summary>
/// <param name="recursionlevel">Detail level, 3 provides a good sphere</param>
/// <param name="size">Size of sphere</param>
/// <param name="pos">Optional world position</param>
/// <param name="ccw">Winding of triangles</param>
/// <returns>Tuple of Vertex with W=1 and texcoords</returns>
static public Tuple <Vector4[], Vector2[]> CreateTexturedSphereFromTriangles(int recursionlevel, float size, Vector3?pos = null, bool ccw = true)
{
var faces = CreateSphereFaces(recursionlevel, size);
Vector4[] coords = new Vector4[faces.Count * 3];
Vector2[] texcoords = new Vector2[faces.Count * 3];
float zcorr = ccw ? -1 : 1;
int p = 0;
foreach (var tri in faces)
{
var uv1 = GetSphereCoord(tri.V1);
var uv2 = GetSphereCoord(tri.V2);
var uv3 = GetSphereCoord(tri.V3);
FixColorStrip(ref uv1, ref uv2, ref uv3);
//System.Diagnostics.Debug.WriteLine(tri.V1 + "->" + uv1 + " " +
// tri.V2 + "->" + uv2 + " " +
// tri.V3 + "->" + uv3 + " "
// );
coords[p] = new Vector4(new Vector3(tri.V1.X, tri.V1.Y, zcorr * tri.V1.Z), 1); // we swap Z for CCW winding order
texcoords[p++] = uv1;
coords[p] = new Vector4(new Vector3(tri.V2.X, tri.V2.Y, zcorr * tri.V2.Z), 1);
texcoords[p++] = uv2;
coords[p] = new Vector4(new Vector3(tri.V3.X, tri.V3.Y, zcorr * tri.V3.Z), 1);
texcoords[p++] = uv3;
}
if (pos != null)
{
GLStaticsVector4.Translate(ref coords, pos.Value);
}
return(new Tuple <Vector4[], Vector2[]>(coords, texcoords));
}
/// <summary>
/// Sphere in triangles
/// </summary>
/// <param name="recursionlevel">Detail level, 3 provides a good sphere</param>
/// <param name="size">Size of sphere</param>
/// <param name="pos">Optional world position</param>
/// <param name="ccw">Winding of triangles</param>
/// <returns>Vertex with W=1</returns>
public static Vector4[] CreateSphereFromTriangles(int recursionlevel, float size, Vector3?pos = null, bool ccw = true)
{
var faces = CreateSphereFaces(recursionlevel, size);
List <Vector4> vertices = new List <Vector4>();
float zcorr = ccw ? -1 : 1;
foreach (var tri in faces)
{
vertices.Add(new Vector4(tri.V1.X, tri.V1.Y, zcorr * tri.V1.Z, 1.0f));
vertices.Add(new Vector4(tri.V2.X, tri.V2.Y, zcorr * tri.V2.Z, 1.0f));
vertices.Add(new Vector4(tri.V3.X, tri.V3.Y, zcorr * tri.V3.Z, 1.0f));
}
var array = vertices.ToArray();
if (pos != null)
{
GLStaticsVector4.Translate(ref array, pos.Value);
}
return(array);
}
/// <summary>A solid cube built with triangles</summary>
/// <param name="size">Size of sides</param>
/// <param name="sides">What sides to construct</param>
/// <param name="pos">Optional, offset position to place model</param>
/// <returns>Vector4 array of positions (w=1)</returns>
public static Vector4[] CreateSolidCubeFromTriangles(float size, Sides[] sides, Vector3?pos = null)
{
size = size / 2f; // halv side - and other half +
List <Vector4> vert = new List <Vector4>();
bool all = Array.IndexOf(sides, Sides.All) >= 0;
if (all || Array.IndexOf(sides, Sides.Left) >= 0)
{
vert.AddRange(new Vector4[] {
new Vector4(new Vector4(-size, -size, -size, 1.0f)), // left side, lower right triangle
new Vector4(new Vector4(-size, size, -size, 1.0f)),
new Vector4(new Vector4(-size, -size, size, 1.0f)),
new Vector4(new Vector4(-size, -size, size, 1.0f)), // left side, upper left triangle
new Vector4(new Vector4(-size, size, -size, 1.0f)),
new Vector4(new Vector4(-size, size, size, 1.0f)),
});
}
if (all || Array.IndexOf(sides, Sides.Right) >= 0)
{
vert.AddRange(new Vector4[] {
new Vector4(new Vector4(size, -size, size, 1.0f)), // right side, lower right triangle
new Vector4(new Vector4(size, size, size, 1.0f)),
new Vector4(new Vector4(size, -size, -size, 1.0f)),
new Vector4(new Vector4(size, -size, -size, 1.0f)), // right side, upper left triangle
new Vector4(new Vector4(size, size, size, 1.0f)),
new Vector4(new Vector4(size, size, -size, 1.0f)),
});
}
if (all || Array.IndexOf(sides, Sides.Bottom) >= 0)
{
vert.AddRange(new Vector4[] {
new Vector4(new Vector4(size, -size, size, 1.0f)), // bottom face, lower right
new Vector4(new Vector4(size, -size, -size, 1.0f)),
new Vector4(new Vector4(-size, -size, size, 1.0f)),
new Vector4(new Vector4(-size, -size, size, 1.0f)), //bottom face, upper left
new Vector4(new Vector4(size, -size, -size, 1.0f)),
new Vector4(new Vector4(-size, -size, -size, 1.0f)),
});
}
if (all || Array.IndexOf(sides, Sides.Top) >= 0)
{
vert.AddRange(new Vector4[] {
new Vector4(new Vector4(size, size, -size, 1.0f)), // top face
new Vector4(new Vector4(size, size, size, 1.0f)),
new Vector4(new Vector4(-size, size, -size, 1.0f)),
new Vector4(new Vector4(-size, size, -size, 1.0f)),
new Vector4(new Vector4(size, size, size, 1.0f)),
new Vector4(new Vector4(-size, size, size, 1.0f)),
});
}
if (all || Array.IndexOf(sides, Sides.Front) >= 0)
{
vert.AddRange(new Vector4[] {
new Vector4(new Vector4(size, -size, -size, 1.0f)), // front face, lower right
new Vector4(new Vector4(size, size, -size, 1.0f)),
new Vector4(new Vector4(-size, -size, -size, 1.0f)),
new Vector4(new Vector4(-size, -size, -size, 1.0f)), // front face, upper left
new Vector4(new Vector4(size, size, -size, 1.0f)),
new Vector4(new Vector4(-size, size, -size, 1.0f)),
});
}
if (all || Array.IndexOf(sides, Sides.Back) >= 0)
{
vert.AddRange(new Vector4[] {
new Vector4(new Vector4(-size, -size, size, 1.0f)), // back face, lower right
new Vector4(new Vector4(-size, size, size, 1.0f)),
new Vector4(new Vector4(size, -size, size, 1.0f)),
new Vector4(new Vector4(size, -size, size, 1.0f)), // back face, upper left
new Vector4(new Vector4(-size, size, size, 1.0f)),
new Vector4(new Vector4(size, size, size, 1.0f)),
});
}
var array = vert.ToArray();
if (pos != null)
{
GLStaticsVector4.Translate(ref array, pos.Value);
}
return(array);
}