Vray + UDK= Archviz
polycounter lvl 12
Any one know how to get Vray lightmass data into UDK for Realtime walkthrough without wasting millions of hours in rendering. 
I know you can bake stuff in Vray onto the textures, but what about dynamic shadows and water, glass etc.
I know you can bake stuff in Vray onto the textures, but what about dynamic shadows and water, glass etc.
Replies
You *might* be able to manually import in some lightmaps if you have access to the old "generic browser" tab (check the various menus? If it's there, then look for a upk with the same name as the map) That would let you see the "package contents" of the actual level you had open--lightmaps and such. You could, in theory, re-import a new lightmap with the same autogenerated name as one that existed to do what you want. But it would be a massive headache to do manually.
More problematic is that I seem to recall UDK actually mixing lightmaps together for a lot of things to save space--having fewer larger sheets. That would make doing a manual reimport process impossible...maybe those lightmap atlases were only for BSP and terrain though...I can't recall.
But goodluck!!
glass:
http://media.cmcdn.net/20477803/780x541.jpeg
with various values:
http://media.cmcdn.net/20477799/780x540.jpeg
the fading ao:
http://media.cmcdn.net/20478946/780x661.jpeg
http://imageshack.us/a/img213/6812/fadingao.jpg
Cubemaps are still the best/cheapest solution for reflections, but scenecapture is also not bad.
you can explain a little more about the glass, is a blur through the object in realtime?????
Anyway. I was thinking about these things, and I was lead up to maybe the best solution for this vray shadow thing. The idea is very similar to how the ibl is working. You need a "lightingmap" cubemap ( a very blurred, colored shadowmap(containing the colors that are caused by the color bleeding))that you render out with vray and you need to use this for the diffuse ibl.Then you need an another baked map, which is the shadowmap (black/white unblurred shadowmap), and you multiply this with the diffuse ibl, plus with an ao map. I recommend to keep these maps separately, because then you can use them as static and dynamic in the same time.I mean imagine that, the environment is static, so nothing is moving, but your character have a flashlight or weapon that is flashing when you are firing.So.When these lights are doing lighting things near to an environment piece, you need to hide the pre made shadows.If the maps are separated,then you can control them separately and you can make them fading (visible when they are not affected by any dynamic lightsource, and invisible when a light hit the surface) .For the specular, you use reflections (like in vray and like in the real life). This can be static (pre-made cubemaps) or dynamic (scenecapture actors), and the glossiness is the blur of the reflection.This can be pre-made (pre blurred cubemap) or real time (blurring the cubemap in real time).This is when you use pre-made cubemaps. And if you use scenecaptures, then you can blur it only in real time. So. After all of that, you have Vray GI/Color Bleeding,Vray shadows,ao and a very similar shader to Vray.
Everything from these things could work very nicely if we could render out proper maps from vray.I'll try to play with baking with Vray.
And here is how it looks in UDK with a controllable material for it.
It needs more work, and probably better bakes, but it could looks almost the same in UDK as it looks on the Vray renders.We just need a shader for it and better bakes.