AcTools.Render.Base.Utils.GeometryGenerator.CreateGeosphere C# (CSharp) Method

        public static MeshData CreateGeosphere(float radius, SubdivisionCount numSubdivisions) {
            var tempMesh = new MeshData {
                Vertices = IcosahedronVertices.Select(p => new Vertex { Position = p }).ToList(),
                Indices = IcosahedronIndices
            };

            var mh = new Subdivider();

            for (var i = 0; i < (int)numSubdivisions; i++) {
                mh.Subdivide4(tempMesh);
            }

            // Project vertices onto sphere and scale.
            for (var i = 0; i < tempMesh.Vertices.Count; i++) {
                // Project onto unit sphere.
                var n = Vector3.Normalize(tempMesh.Vertices[i].Position);
                // Project onto sphere.
                var p = radius * n;

                // Derive texture coordinates from spherical coordinates.
                var theta = MathF.AngleFromXY(tempMesh.Vertices[i].Position.X, tempMesh.Vertices[i].Position.Z);
                var phi = MathF.Acos(tempMesh.Vertices[i].Position.Y / radius);
                var texC = new Vector2(theta / (2 * MathF.PI), phi / MathF.PI);

                // Partial derivative of P with respect to theta
                var tangent = new Vector3(
                        -radius * MathF.Sin(phi) * MathF.Sin(theta),
                        0,
                        radius * MathF.Sin(phi) * MathF.Cos(theta)
                        );
                tangent.Normalize();

                tempMesh.Vertices[i] = new Vertex(p, n, tangent, texC);
            }
            return tempMesh;
        }