md_Glass refracts the input image using the normals and point position pass to estimate the refraction

Can be used as a CameraFx in Flame 2017 or as a Matchbox in Bfx - Now with Chronatic abberation

input required : 0-cameraFx or 5-Bfx

As a Camera Fx the passes are provided automatically by Action

make a scene with a 3D object then parent the camera to the matchbox

Instead of the material showing through the object you will get a refraction of the bg

This can be selected in the shader to be another pass

The specularity can be adjusted and you can mix back the original material

To make it even more fun, add a gmask to the camera to mask the matchbox effect