[Frederik-andre Savard]

By engine, i mean a game engine, like the unreal engine.

Once render, what goes pass the alpha channel will be in additive mode. That information will not be embedded in the video, i know it’s impossible. But i also know that in other compositing software, we can do what i want (like autodesk combustion), but my production pipeline does not let me use another software.

In photoshop, you can draw in you rgb channel, an then draw anything you want in that channel. They are simple channel, that it’s. So there must be a way to do the same thing in photoshop. In 3D compositing, it is one of the simpliest task to do. You map a channel, that’s all. So that’s why my question might sound wierd but it is suppose to be actually a very simple process.

And unfortunatly no, i can’t render a second pass for the glow. I already have a -not so great fps-, so adding another layer will simply kill it.