![]() The light reflects off the side of the bumps and out to the eye. In fact, the useful viewing angle of reflection for a diffuse material is pretty wide meaning the effect works for the audience, wherever they are. A light source skimming across the surface is reflected back in many directions, including “out front” to the viewer. ![]() What happens when you light a diffusing material like felt?Ī felt covered flat or a Cyclorama has a diffusing surface that scatters light in many directions because at a micro level it’s, well, bumpy. ![]() Let’s take a look at the basic physics behind the problem. They give the lighting designer a headache. Perspex plinths, PVC wall coverings and glass table tops all have one thing in common. As well as traditional wood, paint and cloth finishes, they love to use polymers and glass. The set designers of today, whether creating environments for the TV studio, award shows or exhibition stands, have access to a wide range of materials. A pretty standard technique for this kind of show, making a pleasing backing for things to happen in front of. The question was specifically asking about successfully uplighting the shiny PVC from the floor using LED battens to create a changing coloured background. Last week, a Project Manager sent me an email asking for my thoughts on forthcoming plans to use white PVC covered flats to back an award show, rather than using their usual finish material of felt. Plus the comforting constancy of physics and being able to predict what happens to a stage lighting beam once you’ve let it fly. ![]() The title sounds like an action movie but we are looking at some lighting theory of reflection, the angle of incidence and interaction of light with different surfaces. ![]()
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