I'm experimenting with using an orthographic camera projection for my skydome....never played with ortho projection before...doesn't display the skydome, just a big white circle. Previously I was using a perspective camera... projectionMatrix = CreatePerspectiveFieldOfView(MathHelper.ToRadians(45), aspectratio, nearclip, farclip); And this is the ortho camera projection matrix that doesn't work... orthoProjectionMatrix = CreateOrthographic(Viewport.Width, Viewport.Height, nearclip, farclip); I basically want the same view as from the perspective cam, but with an ortho cam. Any idea what I'm doing wrong? THANKS