x

Search in
Sort by:

Question Status:

Search help

  • Simple searches use one or more words. Separate the words with spaces (cat dog) to search cat,dog or both. Separate the words with plus signs (cat +dog) to search for items that may contain cat but must contain dog.
  • You can further refine your search on the search results page, where you can search by keywords, author, topic. These can be combined with each other. Examples
    • cat dog --matches anything with cat,dog or both
    • cat +dog --searches for cat +dog where dog is a mandatory term
    • cat -dog -- searches for cat excluding any result containing dog
    • [cats] —will restrict your search to results with topic named "cats"
    • [cats] [dogs] —will restrict your search to results with both topics, "cats", and "dogs"

How do auto-generate a 2nd UV for lightmaps?

I'm new in Unreal Engine and I'm previously created game in Unity. I have many assets from my Unity projects and I would like to transfer its to Unreal Engine. All went good except one thing: UV second channel. In Unity it generates automatically and also works fine. How can I do that in Unreal? Is possible any better way to do this than edit all my 2000 meshes in 3D software like Maya or 3ds Max?

Thanks for your reply.

Regards, Patrick

Product Version: Not Selected
Tags:
more ▼

asked Apr 05 '14 at 03:36 AM in Using UE4

avatar image

kodmistrz
334 54 83 103

(comments are locked)
10|2000 characters needed characters left
Viewable by all users

2 answers: sort voted first

If all of your meshes are UV mapped in channel 1, then you can use auto generator to use that channel to create lightmap UV's for the second channel(Static Mesh Editor > Window > Generate Unique UVs.)

more ▼

answered Apr 05 '14 at 04:34 AM

avatar image

Jacky
16.8k 671 167 676

avatar image Anadin Apr 19 '14 at 04:08 AM

Is there a timeline for this being available in the Mac? even though I do quite like making my own its a real time save during early dev to just quickly generate one in the engine

avatar image GreasyExcretion Oct 21 '14 at 09:50 PM

Has this feature been removed now?

It's no longer under Static Mesh Editor > Window as of version 4.5

avatar image Jacky Oct 21 '14 at 10:07 PM

It isnt removed, it just got more simplified. You can either enable the checkbox to generate UV's during import, or you can go to static mesh editor > Details panel > LOD tab > enable Generate Lightmap UV's, then hit Apply Changes button.

avatar image mgffrankmli Dec 04 '14 at 08:10 AM

The item Enable Generate Lightmap UV's in LOD tab is gone in 4.6.

avatar image Anadin Dec 04 '14 at 08:24 AM

I have it under the main section of the Mesh in the editor alt text

avatar image Sentura Jan 11 '15 at 06:41 PM

Just to follow up on this topic: Generating lightmaps does nothing for the mesh to get lit. Ironically it gets lit when lightmass hasn't yet been built.

I'd like to know how to solve this.

avatar image Anadin Jan 11 '15 at 10:29 PM

Interesting, can you send a screenshot of your scene, what type of lights do you have?

avatar image Jacky Jan 15 '15 at 12:37 PM

It is Generate Lightmap UV's, so it creates a proper UV layout for light baking, it doesnt generate the lighting itself. Lighting wise what you see in the viewport before you build lighting is for previewing.

avatar image samrichards Apr 13 '17 at 05:20 PM

I prefer some of my models in the preview lighting as some of my lightmaps are overlapping causing black shadowing. Is there a way to not bake the lighting of certain models?

avatar image Cameron Abt May 21 '17 at 09:57 PM

You can make those meshes movable which tells lightmass not to bake lighting. However, unless you have dynamic lighting setup for your scene (movable or stationary lights), those models will only be lit by the indirect lighting cache and may or may not look good or realistic.

The best answer would be to unwrap your models in 3dsMax or another modeling tool to make sure the 2nd UV channel doesn't have overlapping UVs.

(comments are locked)
10|2000 characters needed characters left
Viewable by all users

If I can't find (Static Mesh Editor > Window > Generate Unique UVs.)?? I've not seen it and I've been looking for it in hours.

more ▼

answered Apr 28 '17 at 12:47 PM

avatar image

Daniel_Fagerhult
1

avatar image Anadin Apr 28 '17 at 11:53 PM

Just checking on 4.15 and its still there, you may have to press the show advanced button OR use the search at the top the Details tab on the right.

alt text

Then it is a bit further down

alt text

(its not a menu option)

showadvanced.png (16.4 kB)
lightmap.png (37.5 kB)
(comments are locked)
10|2000 characters needed characters left
Viewable by all users
Your answer
toggle preview:

Up to 5 attachments (including images) can be used with a maximum of 5.2 MB each and 5.2 MB total.

Follow this question

Once you sign in you will be able to subscribe for any updates here

Answers to this question