r.Upscale.Panini.D

Allow and configure to apply a panini distortion to the rendered image. Values between 0 and 1 allow to fade the effect (lerp) Implementation from research paper Pannini: A New Projection for Rendering Wide Angle Perspective Images 0: off (default>0: enabled (requires an extra post processing pass if upsampling wasn't used - see r.ScreenPercentage 1: Panini cylindrical stereographic projection