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mouse coords to world coords

Posted Friday, 15 March, 2013 - 15:17 by zgintasz in

Hi,
I'm making a windows forms application with opengl view. I need to get the mouse coords converted to the opengl world coords. How can I do that? Here is a bit of code, which might be useful:

        private void SetupViewport()
        {
            ...
            GL.Viewport(ClientRectangle.X, ClientRectangle.Y, ClientRectangle.Width, ClientRectangle.Height);
 
            Matrix4 projection = Matrix4.CreateOrthographic(Width / zoom, Height / zoom, 1.0f, 64.0f);
            GL.MatrixMode(MatrixMode.Projection);
            cameraMatrix = Matrix4.CreateTranslation(0f, 0f, 0f);
            GL.LoadMatrix(ref projection);
 
        }
        private void RenderView()
        {
            GL.MatrixMode(MatrixMode.Modelview);
            GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
            GL.LoadMatrix(ref cameraMatrix);
            ...
        }

Thanks.

‹ Picking/Selection using Vb.NET GL.DrawElements AccessViolationException ›

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zgintasz's picture

Re: mouse coords to world coords

Posted Tuesday, 19 March, 2013 - 16:34 by zgintasz

bump, really need that.

alarial's picture

Re: mouse coords to world coords

Posted Saturday, 23 March, 2013 - 02:56 by alarial

I haven't messed with 3d translation of the mouse but I was able to convert mine to 2d using the following code in my mouse button down event handler:

float x = (e.X / (ClientRectangle.Width / 2.0f)) - 1;
float y = -(e.Y / (ClientRectangle.Height / 2.0f)) + 1;
zgintasz's picture

Re: mouse coords to world coords

Posted Monday, 25 March, 2013 - 12:05 by zgintasz

it doesn't converts coords correctly. The calculation should also somehow use cameraMatrix...

zgintasz's picture

Re: mouse coords to world coords

Posted Monday, 1 April, 2013 - 20:16 by zgintasz

EDIT: nevermind, fixed it.