public void GenerateSphere(float radius, int rings, int sectors)
{
Destroy();
float R = 1.0f / (rings - 1);
float S = 1.0f / (sectors - 1);
Vertices = new Vertex3d[rings * sectors];
int index = 0;
for (int r = 0; r < rings; r++)
{
for (int s = 0; s < sectors; s++)
{
float x = (float)(Math.Cos(2.0 * Math.PI * s * S) * Math.Sin(Math.PI * r * R));
float y = (float)(Math.Sin(2.0 * Math.PI * s * S) * Math.Sin(Math.PI * r * R));
float z = (float)Math.Cos(Math.PI * r * R);
var vertex = new Vertex3d();
vertex.TexCoord.X = s * S;
vertex.TexCoord.Y = r * R;
vertex.Position.X = x * radius;
vertex.Position.Y = y * radius;
vertex.Position.Z = z * radius;
vertex.Normal.X = x;
vertex.Normal.X = y;
vertex.Normal.X = z;
vertex.Color = new Vector4(1.0f, 0.0f, 0.0f, 1.0f);
Vertices[index++] = vertex;
}
}
index = 0;
for (int r = 0; r < rings; r++)
{
for (int s = 0; s < sectors; s++)
{
Indices.Add((uint)(r * sectors + s));
Indices.Add((uint)(r * sectors + (s + 1)));
Indices.Add((uint)((r + 1) * sectors + (s + 1)));
Indices.Add((uint)((r + 1) * sectors + s));
}
}
GL.GenBuffers(1, out VertexBuffer);
GL.GenBuffers(1, out IndexBuffer);
GL.BindBuffer(BufferTarget.ArrayBuffer, VertexBuffer);
GL.BufferData(BufferTarget.ArrayBuffer, (IntPtr)(Vertices.Length * Vertex3d.Stride), Vertices, BufferUsageHint.StreamDraw);
OpenGlHelper.CheckErrors();
GL.BindBuffer(BufferTarget.ElementArrayBuffer, IndexBuffer);
GL.BufferData(BufferTarget.ElementArrayBuffer, (IntPtr)(Indices.Count * sizeof(uint)), Indices.ToArray(), BufferUsageHint.DynamicDraw);
OpenGlHelper.CheckErrors();
}
private void UpdateIndexBuffer()
{
GL.BindBuffer(BufferTarget.ElementArrayBuffer, IndexBuffer);
GL.BufferData(BufferTarget.ElementArrayBuffer, new IntPtr(CountIndices * sizeof(uint)), Indices.ToArray(), BufferUsageHint.DynamicDraw);
OpenGlHelper.CheckErrors();
}
private void UpdateVertexBuffer()
{
GL.BindBuffer(BufferTarget.ArrayBuffer, VertexBuffer);
GL.BufferData(BufferTarget.ArrayBuffer, (IntPtr)(Vertices.Length * Vertex3d.Stride), Vertices, BufferUsageHint.StreamDraw);
OpenGlHelper.CheckErrors();
}
