Now, in trying to speed up my rendering code i'm trying to replace all the glBegin glVertex glEnd etc. calls with vertex arrays or VBOs. This is what i have so far, using Tao.OpenGL and Visual C#:

unsafe {
	fixed (float* data_ptr = data) {
					
					
				
		Console.WriteLine("A");

								 				Gl.glEnableClientState(Gl.GL_VERTEX_ARRAY);
		Console.WriteLine("B");
		int i = 0;
		for(int j = 0; j < points.Length; j++){
			data[i++] = (float)points[j].x;
			data[i++] = (float)points[j].y;
			data[i++] = (float)points[j].z;
		}
		Gl.glVertexPointer(1, Gl.GL_FLOAT, 0, (IntPtr)data_ptr);
		Console.WriteLine("C");
		Gl.glDrawArrays(Gl.GL_POLYGON, 0, 1);
		Console.WriteLine("D");
												Gl.glDisableClientState(Gl.GL_VERTEX_ARRAY);
		Console.WriteLine("E");
	}
}

"data" is a big static array of floats i'm stuffing the point data into before i pass it in as a vertex array, so i don't have to create an array each time. Just trying to get it working first; can add on textures/shading/whatever later. I'm not particularly happy with having to do all the voodoo with unsafe code and pointers and whatnot, but more importantly this code crashes immediately after C with no error message to speak of. I'm guessing this has something to do with the pointer magic, although i've tried various methods of extracting the IntPtr from the float[] and have not have any luck at all. Anyone know what's wrong with that? Am i forgetting to enable/disable something, or passing a wrong parameter into one of the gl... calls? edit: for reference, the code this is replacing (that works) is: Gl.glBegin(Gl.GL_POLYGON); for(int j = 0; j < points.Length; j++){ Point3DG p = points[j]; Gl.glVertex3d(p.x, p.y, p.z); } Gl.glEnd(); I just want to get the Vertex Array code working first, nevermind the fact that in it's current state it's probably not any faster.

You should create the VBO only once, not every frame.

i replaced both things you mentioned, and it still crashes after "C" with no error message(dammit). I know about converting to triangles and re-using the VBO and whatnot, but i just want to get a simple "Hello Vertex Array" working first before i get it working well. It crashes on the first frame too, so it's not a problem with re-creating the thing each frame.

Take a look at this tutorial.
http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=45