I want to get a Hologram effect like in the image uploaded here:
I need to place the hologram over a real video clip, so lots of transparency. Works perfectly, following this guy's advice here.
Now I like to have some God Rays to it (realistic hologram needs a projection light cone). High-energy-spot with volumetric scattering (material node of a cone just outside the spot light cone). So far, so good.
Now: whatever I try, I do not get the light rays' background transparent. Black works. Looks nice
But I need to place the whole thing on top of a real video clip and I do not get some black streaks out of the light rays - however I try and adjust any nodes with whatever Alpha effect.
And to make it worse, I had it all, five years ago, and just can't remember how I did it...
Could anyone just get me God Rays with a perfectly transparent background for me; to place them onto a video clip?