public void Update(Camera camera, Size viewportSize)
{
// Pre-divide the position to make them small
var pos = camera.GetPosition() / FRUSTUM_DIVISOR;
var target = camera.Target / FRUSTUM_DIVISOR;
var dir = System.Numerics.Vector3.Normalize(target - pos);
//Extract the up vector from the second column of the rotation matrix
System.Numerics.Matrix4x4 rotMatrix = camera.GetRotationMatrix();
System.Numerics.Vector3 up = new System.Numerics.Vector3(rotMatrix.M21, rotMatrix.M22, rotMatrix.M23);
var frustumParams = new FrustumCameraParams()
{
Position = pos.ToSharpDX(),
LookAtDir = dir.ToSharpDX(),
UpDir = up.ToSharpDX(),
AspectRatio = viewportSize.Width / (float)viewportSize.Height,
ZFar = FRUSTUM_DIVISOR * 200,
ZNear = 1 / FRUSTUM_DIVISOR,
// Blow up FOV a bit for cases when out-of-bounds objects are used
FOV = camera.FieldOfView * 1.2f,
};
if (!_frustumParams.HasValue ||
_frustumParams.Value.Position != frustumParams.Position ||
_frustumParams.Value.LookAtDir != frustumParams.LookAtDir ||
_frustumParams.Value.UpDir != frustumParams.UpDir ||
_frustumParams.Value.FOV != frustumParams.FOV)
{
_frustumParams = frustumParams;
_frustum = BoundingFrustum.FromCamera(frustumParams);
}
}
public void CreateBoundingFrustum()
{
Matrix invView = Matrix.Invert(ViewMatrix);
CameraFrustum = BoundingFrustum.FromCamera(ViewLocation, -invView.Forward, invView.Up, Fov, ScreenNear, ScreenFar, ScreenWidth / ScreenHeight);
}
void UpdateFrustum()
{
m_frustum = BoundingFrustum.FromCamera(m_position, m_look, m_up, m_fovY, m_nearZ, m_farZ, m_aspect);
m_frustumDirty = false;
}
