I need a snow mat and I made pretty basic one that seems good enough to me.
But there’s one little thing that I want to achieve, is a snowflakes blinking like in the new battlefront game.
What I have - http://img.5cm.ru/view/i6/Qox8.png - it’s just a roughness map, so it’s not enough.
What I want to achieve - http://img.5cm.ru/view/i6/t6uy.png - in UE4 it starts to blink like that only if you add a metalness map to it (and only if view angle is small enough), but that is obviously not an option.
You might need something like L4D2’s Retro-Reflective material. I’m not an expert in materials so I can’t help you, but you might find something on Google
…I guess you could try amping up the specularity on those spots using your roughness map. It’s not physically correct, but [I’m pretty sure] it gets the job done.
What I’m failing to do is getting the sun direction. If you can do that, then multiply it by an emission mask (those dots) and feed it to the Emissive slot. That should probably make the dots glow only at the sun direction.
This fails when snow material is at sun shadow. I would just place spark material(color = 1,roughness = 0, specular = 1) to random places and just let the ue4 lighting system do the magic
The whole point is, it should not be tied to the sun direction. In fact some snowflakes might be lying at the proper angle to you and the sun so you’ll see the reflection in the opposite direction.
Interesting, thx for the link. I’ll try to reproduce that though not sure it’ll work with PBR
edit: as expected, using specular with PBR in any way isn’t doing much difference and actually gives worse result than not using it
