Lets make Lightmass EPIC (and understandable)

[Norman3D]

Can anybody help me what is the problem with my scene? I try a lot of things which in the topic too, but none of them solve my problem. Thanks for the help!

This is what is happening, it's bug that isn't fixed yet:

The black shadow in corners is due to too much biasing by Lightmass when tracing gather rays. With point and spot lights, only the first bounce uses a gather and is affected by this bug, while the rest of the bounces come from photon mapping which is not affected. With multibounce skylight, all bounces are gathers and are affected by this bug so the artifact is much more noticeable.

This is completely solvable but I just ran out of time for 4.18. It's high on my priority list.

[Daciansolgen]

I have a big problem. When I follow all tutorials on how to achieve photorealistic architecture in unreal I don’t get it. It can’t get the soft lightning and shadows. If I have sun light pointing trough the window I got light casting on wall but not reflecting the whole room as it does in real time. Can you help to achieve photo realism.

[ZacD]

I have a big problem. When I follow all tutorials on how to achieve photorealistic architecture in unreal I don’t get it. It can’t get the soft lightning and shadows. If I have sun light pointing trough the window I got light casting on wall but not reflecting the whole room as it does in real time. Can you help to achieve photo realism.

Post a screen shot. No one can tell what issues you are facing from a simple description.

[thejturner]

**SOLVED: I found out my mesh receiving the shadow was scaled and thus causing the bad shadows. Hope this is helpful to anyone else who makes that mistake.


Hi All,

I posted this in answer hub but thought I would try my luck here as well.

I've been diving deeper into baked lighting and I'm seeing very low quality shadows produced by static lights. I've searched the forums far and wide, I've tried all the usual tweaks to remedy them but I'm running out of ideas. My settings seem like they should produce higher quality shadows so I'm wondering if I'm missing something obvious or if it's a bug.

I made a simple test level using starter and built-in engine content. I'm using 4.18.3, forward renderer on a Mac. Building at higher quality seems to have no effect on the shadow quality. Lightmap compression is off. All the meshes seem to have enough lightmap resolution. Raising it only increases the quality marginally. Raising it too high (to 2048 for the floor) seems to break the light map (it just turns into a smudgy mess).

Hopefully someone may have some ideas for anyone having the same issue as me.

Here are my lightmass settings...


Stationary light lightmap resolution and baked result...



Spotlight lightmap resolution and baked result...

[S-Dot]

Have you tried to give the light source a "source radius" larger than zero? - This looks pretty bad. Should be better. There is also a pretty visible aliasing on the geometry. I wonder if it is your video card or your general settings.

[TAXI]

Test VLM + Sky Lighting Bounces
Use only emmisive textures (50 bounces)
VLM(5;30) + Volume fog
Spheres - moves objects

[TAXI]

Test VLM + fog

[Crawlewis]

Dropbox Link[/URL].

Will be doing some more tests soon with complex projects.

Hello guys, anybody have this file yet?

[Farshid]

Hello guys, anybody have this file yet?

GoogleDrive
https://docs.google.com/uc?id=0B3wYK...xport=download

Dropbox
https://www.dropbox.com/s/0ljra2l3h0...dNaji.zip?dl=0

Microsoft OneDrive
https://1drv.ms/u/s!Ar7INFDcXdscgnWMCXW4AKFmf0Sa

Mediafire
http://www.mediafire.com/download/9x...arshidNaji.zip

4shared
http://www.4shared.com/zip/8ARByBcice/FarshidNaji.html

Uptobox
http://uptobox.com/s6m3icy2uknu

[Raghu]

GoogleDrive
https://docs.google.com/uc?id=0B3wYK...xport=download

Dropbox
https://www.dropbox.com/s/0ljra2l3h0...dNaji.zip?dl=0

Microsoft OneDrive
https://1drv.ms/u/s!Ar7INFDcXdscgnWMCXW4AKFmf0Sa

Mediafire
http://www.mediafire.com/download/9x...arshidNaji.zip

4shared
http://www.4shared.com/zip/8ARByBcice/FarshidNaji.html

Uptobox
http://uptobox.com/s6m3icy2uknu

Thanks for helping the community. Cheers.

[Gnorkie]

This is what is happening, it's bug that isn't fixed yet:

I still get that error on 4.19.2

I guess it has yet to be fixed...

[Saturndj]

Can anybody help me what is the problem with my scene? I try a lot of things which in the topic too, but none of them solve my problem. Thanks for the help!

I have the same problem.