Aspect Ratio and Hotspot/Beam relation to Horizontal FoV in Free Spot Light?

Community

Forums

3ds Max Shading, Lighting and Rendering

Welcome to Autodesk’s 3ds Max Forums. Share your knowledge, ask questions, and explore popular 3ds Max materials topics.

Back to Topic Listing
Previous
Next

Message 1 of 1

379 Views, 0 Replies

I have a rectangular Free Spot light and I need to precisely know the effective Horizontal and Vertical "Field of View" of the light (HFOV and VFOV) based on the Hotspot/Beam angle and the aspect ratio.

This is pretty easy when the aspect ratio is 1, since HFOV=VFOV=Hotspot/Beam. However if the aspect ratio is different then obviously HFOV does not equal VFOV.

Does anyone know the equation to relate HFOV and VFOV to aspect ratio and Hotspot/Beam?