Realtime GI passes through walls

So scoping out the real time GI stuff and it seems inconsistent when you want to make rooms actually dark. I set up this experiment with 2 rooms next to each other with no openings anywhere. If you put a light in the room on the left (shadows are turned on), it will light the inside of the room, but then the light also passes out of the room and into the room next to it. Here is the set up:


Inside the box on the left:

Inside the box on the right, with light leaking in(!):

So you can see the light both on the outside of the boxes as well as inside.

Here is what it looks like with baked light only, which turns out as one would expect:

How can we prevent this from happening? (Note the inside and outside of the boxes have no connected verts and the box on the right is even separate objects between the inside and out)

 

Look at your own first screenshot, read the warning text on the right.

 

Well yup, that would explain it. Does this make it impossible to have a dark room next to a light room with the real time GI? The room on the right does indeed turn black when the bounce intensity is turned to zero. Also bounced light seems completely unaffected by culling settings.

 

Use emissive surfaces instead of lights.

 

Do you have an example of what you mean here

 

The Standard Shader Material has an Emissive entry in it. Create a Plane or Cube, apply a new Material to it and tweak the Emissive value as you wish. There you go: an emissive surface You could probably use an Area Light, though...

 

Yeah, because I was also experimenting with making the walls themselves emissive.

Emmisive materials are having strange behavior. It seems to work in the editor Scene view in real time, but when going into play mode, editing the brightness or color does not change the real time GI.
http://gfycat.com/DazzlingSpanishFlounder


Light probes were also behaving strangely as well.

 

Okay never mind, it appears you have to use the DynamicGI.SetEmissive(renderer,Color.white); function like so. I don't know why this is so unintuitive, but works! That said, is there a way to reduce the fade time on the GI to be more snappy

 

The 'fade' time I would assume is dependent on how long it takes the light to propagate through the precomputed links. Guessing it's directly dependent on your GI complexity / resolution.

 

Also emissive shader thing works slightly better but I'm still experiencing a lot of bleeding into other rooms if the walls are close by:



I would imagine this is dependent on the realtime gi resolution? but not sure. Does anybody light scenes well only with emissive surfaces?

 

Okay it seems better at 30 resolution, but still not great...



Also I imagine baking at 30 resolution will be rather difficult for large scenes. This is just two boxes next to each other.

 

Seal your room from the outside and give your walls thickness.

 

Here the rooms are fully enclosed with thickness and separation and the light still bleeds through plenty

 

Also, for goodness sake I'm get light bleeding on a just statically baked lightmap with 1 light bounce and a point light and a 1 foot thick wall at 30 res

 

Old thread, but I've been experiencing the same bleeding for all of my static geometry, even if they are within the same mesh. I'll try out the ideas in this thread. (BTW I love intruder so much, thanks Mr. Storm!)

 

if you have GPU to spare, try out SEGI, no leak, no bake or enlighten funny business.

 

I try to avoid using a single cube for a room. Instead, import a model which has the walls, floor, ceiling all as separate meshes. There's too many issues that happen when you try to treat all of these as a single cube: from GI issues to OC issues.
Also, if you add a lightmap static plane between the two cubes, it should block all GI flowing between the two cubes.

 

Hi, i'm having similar light leak issues (with directional), did anyone find any solution to this problem?

 

Merge roof and wall vertexes together to fix completely this issue.
Maya: Mesh Tools->Merge

 

Reference

http://imgur.com/a/ISQJr

 

I use SketchUp and 'merged' walls and columns as you suggested but encountered another problem. When i save SkethcUp file, my model reimports automatically (auto-refresh) in Unity but it doesn't appear or replace inside 'viewport' (it was working fine before when i add new objects).

Images below shows old walls (duvar) & columns (kolon) still appear (see their axes) in the hierarchy somehow (they no more exist in SketchUp). And new 'merged_wall' mesh is imported and be seen in assets but not in viewport. Why is this happening?

 

Drag again your model into scene from project files

 

Thank you Ali for your help, i did as you explained but result is literally same as before.

 

Your roof geometry is completely separated from your wall. you should create more edges and points between roof and wall connections and then merge those connected vertexes.
A simple way to do this is boolean(Union) operation in max or maya in between wall and roof.

 

I think you misunderstood me because of the previous example i show. I was just testing quickly with walls to see how it goes. So, in the end i merged everything including floors, ceiling and walls. (I left the 'merged_walls' name not to break the links for now to avoid 'redragging'.)
---
Edit: How can i share Unity project?
Here is the .skp file if you want to download and have a look: https://3dwarehouse.sketchup.com/model/c79460c3-4a3e-4090-9b7b-bbc2c9ab1c21 (version 2015 is compatible with Unity)

 

Yes I'm sorry that was wrong

here is difference between resolution 2 and 10:

 

Here is my difference between indirect resolution 2 and 10. Considering amount of time required for baking higher resolution, the result is not satisfying, is it? Also it's quite weird that while some of the leak has gone, new leaks are produced.

 

No
Create a new lightmap parameter file and set its Resolution to 10
I already tested all settings. Only resolution affected to this issue

 

Allright, i've made a new lightmap parameter and increased the resolution under Precomputed Realtime GI, here is the result with 6 res. (10 res. is unbearably slow even with this empty room and gives this error: "Failed executing external process for 'Clustering' job.")


As you can see even though leak is reduced, on top of left wall new leak appears. I'm really going to conclude that this is a bug with Enlighten, because there is no solution in either forums or 'answers' section...

 

Send me your model to find a solution if it exist

 

I've shared the SketchUp model in post #25 (info is there as well). It can be downloaded from that site.

 

Same problem after 3 hours baking


also your model has been combined into one chunks. More chunks has higher lightmap uv space and resolution.
Slice your model into more chunks and test again.

 

progressive lightmapper in chunked model with different resolutions:

 

Another solution
1. Create two lightmap parameters. one with low res and another with high res
2. Assign low res as scene parameters and assign high res one to walls and floor geometry in mesh renderer

result is very faster bake :

 

I got a reply to my bug report today as seen below. And I managed to solved the problem by using Progressive Lightmapper (preview) with 0 backface tolerance (result also below).
Thank you for your effort Ali!

 

I thought you wanted real-time. For baked, PLM is best choice. The problem was from low Resolution and with PLM you can bake with very high resolutions.
Also your problem will not be fixed with 0 BakceFace Tolerance. You should be use default settings with higher resolution.

Also backface problem has been fixed in 5.6.1patch4 and 2017.1beta9