I am using rhino (and VRay) to replicate the same view as taken by a camera. There is clear camera/lens geometry that can be calculated eg an 18mm lens gives a horizontal field of view of 90 degrees; and a 50mm lens gives a horizontal field of view of 39.6 degrees.
So I am expecting the Rhino 6 camera to give the same results. But is doesn’t. I have created a very simple model to test this. It includes 360 columns located in a polar array around a central camera. I can change the Rhino camera lens to give whatever lens I choose. It is then very easy to check what horizontal field of view I get in the viewport window. VRay 3 then renders the same view geometry.
The problem I am faced with is the Rhino cameras appear to be incorrect. If the camea is set to 50mm I actually get a horizontal field of view around 46degrees (rather than the expected 39.6 degrees). If I set the camera lens to 60 mm I get 39.6 degrees.
It suggests to me that the Rhino 6 camera is set up incorrectly.
Could McNeel look into this, is there a there a fix?