oops, was using the wrong shader
make this a bit less insane
fullscreen quad, no need for mvp anymore
Revert "fullscreen quad, no need for mvp anymore"

This reverts commit 7703c783dc52264b7a1d36f2302ebf8105e06f56.
that *seems* correct
no need to set the shader, works fine without an MVP
improved blending..
color improvements, the intensity/falloff needs big time adjustment though