In the AbstractCamera::setFrustumPerspective() method, the frustum top and bottom are computed using the following code:
float h = FastMath.tan( fovY * FastMath.DEG_TO_RAD ) * near * .5f;
frustumBottom = -h;
frustumTop = h;
I don't understand this line: if fovY is the entire angle, I think the line should be float h = FastMath.tan(fovY * 0.5 * FastMath.DEG_TO_RAD) * near;
Could someone explains me why it's done like that? Or is it an error?
Actually, I think he's correct. It has not come up before because the end result for the standard value (45degrees) ends up being pretty close. Since our frustum calcs are based on the frustum* values, it did not hurt the bounding checks or anything either, so really how many people would be able to tell you that they were seeing 53 degrees instead of 45?
Not related to this but i cant figure out why if i use LWJGLCamera.lookAt and then get the view matrix back from OpenGL, i get different result than when i try to calculate the viewmatrix myself as described here:
I recall that I did not change it in jme 1.0 because it would change the behavior of everyone's projects that use 1.0 jME. Yes, it is an error that makes the FOV incorrect, but perhaps people have coded to the results rather than the expected behavior? Thoughts? Perhaps that is not a big deal.