/// <summary>Handles the mouse down event</summary>
private void frmHelloCube_MouseDown(object sender, MouseEventArgs e)
{
isDown = true;
preCursorPosition.Set(PerDeg(e.X, ClientRectangle.Width), PerDeg(e.Y, ClientRectangle.Height), 0);
cursorPosition.Set(PerDeg(e.X, ClientRectangle.Width), PerDeg(e.Y, ClientRectangle.Height), 0);
this.Invalidate();
}
/// <summary>
/// Retrieves the camera vectors eye, at and up if this matrix would be a view matrix
/// </summary>
/// <param name="Eye"></param>
/// <param name="At"></param>
/// <param name="Up"></param>
public void GetLookAt(ref SLVec3f Eye, ref SLVec3f At, ref SLVec3f Up)
{
SLMat4f invRot = new SLMat4f(this);
SLVec3f translation = new SLVec3f(m[12], m[13], m[14]);
invRot.m[12] = 0;
invRot.m[13] = 0;
invRot.m[14] = 0;
invRot.Transpose();
Eye.Set(invRot.Multiply(-translation)); // vector to the eye
Up.Set(m[1], m[5], m[9]); // normalized look up vector
At.Set(-m[2], -m[6], -m[10]); // normalized look at vector
}
