CG Wishlist


Barn Doors (Hotspot, Falloff):


When using vray lights, I frequently want to control how much light spills towards the edge of the area light.

Hotspot and Falloff


In 3dsmax, this is controlled by an artificial limit defined by a hotspot distance (full light), and a falloff distance (no light at all).





The Brazil renderer made this even more versatile by adding a transition curve, so you could actually control the curve of how the illumination transitioned between these two distances.



Standard Falloff Curve...



Modified Curve...



Result...



Modified Curve...



Result...



Barn Doors

I know that vray prefers to deal with real world features if possible, so if a hotspot / falloff is not possible, another possibility is a set of barn doors. While technically a different feature, it achieves a similar effect, which is to limit the light from the edges of the light source without changing the characteristic of the light itself. Here's a practical example of barn doors with a diffuser:



http://lowel.tiffen.com/edu/light_controls/barndoors.html

While a barn door can be used to directly cut off the light, usually one would use a barn door to softly remove light from a particular side. Maybe vray could have both...

All barn doors would have a softness parameter to control how blurry the edge would be.

Here's a short video discussing barn doors (starts at 3:19)

https://www.youtube.com/watch?v=Qgq_AReemN4


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