I am drawing a 2D mesh imported from CAD. The mesh vertex coordinates are in feet from some arbitrary origin and Z is always 0. I am supplying the coordinates to my shader program and using projection matrix, view matrix and model matrix to display everything. I am also using the view matrix and the model matrix to pan and zoom my 2D scene. I am trying to get the coordinates in feet from my mouse cursor coordinates. Should be a straightforward solution. A matrix multiplied by it's inverse will give you an identity matrix but something is very wrong. Here is my code (don't lough at the vb, I took over an old project):
Private Sub openGLControl1_MouseMove(sender As Object, e As MouseEventArgs) Handles openGLControl1.MouseMove
Dim UnprojectMat As mat4 = glm.inverse(scene.projectionMatrix * scene.viewMatrix * scene.modelMatrix)
Dim wCoordsVec As vec4 = UnprojectMat * New vec4(2 * e.X / openGLControl1.Width - 1, -(2 * e.Y / openGLControl1.Height - 1), 0, 1)
wCoordsVec = wCoordsVec / wCoordsVec.w
wCoordsLabel.Text = wCoordsVec.x.ToString + ", " + wCoordsVec.y.ToString
End Sub
And this is my vertex shader:
#version 150
in vec3 in_Position;
uniform mat4 projectionMatrix;
uniform mat4 viewMatrix;
uniform mat4 modelMatrix;
void main(void) {
gl_Position = projectionMatrix * viewMatrix * modelMatrix * vec4(in_Position, 1.0);
//pass_Color = in_Color;
}
The in_Position vector is what I'm trying to get. As you see, I normalized the mouse coordinates for the -1, 1 coordinate system. I don't have a viewport. I'm just using the entire gl control window. Please help me pinpoint what I'm doing wrong.
