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 to auto-generate UV Lightmap?

Hi, I have a static mesh. I added in blender a 2nd UV Texture. Now I have 3 UV Channels in my Static Mesh (no idea why). Well, I can't seem to find the option for auto-generating uv lightmap. It should be in the window drop-down menu but it isn't there.

Product Version: Not Selected
more ▼

asked Jan 17 '15 at 04:10 PM in Using UE4

avatar image

885 46 45 80

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

1 answer: sort voted first

If you have more than one UV map in your FBX export, UE4 assumes the first UV map is the texturing data and the second UV map is the lightmap. If it's not a second channel in the FBX, UE4 will ask you if you want it to generate the light map on your own at the time of import. I don't think you can ask it to build them later on without a reimport. Although a lot of times it doesn't do the greatest job in the world for light maps and people make their own.

Your options:

  1. Delete all but one of the UVs maps from your Blender file and export the FBX with one UV map and let UE4 build the light map on import.

  2. Make sure the first UV map in your Blender file is the normal texture map. Make the second UV map be your lightmaps - look around for some tutorials if you're not sure how to make lightmap UVs. I don't think UE4 will care if there are more than 2 UV maps, I'm guessing it will just ignore them.

more ▼

answered Jan 17 '15 at 10:07 PM

avatar image

696 26 86 62

avatar image birdfreeyahoo Jan 18 '15 at 11:58 AM

Yeah I found out I had 3, because 2 from blender, and in the lightmap generation settings, there was index 2 as destination, setting it to 1 removed the channel.

(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