Why can't i change Lightmap coord index when having multiple LODs?

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2

Hi -

LODs work in tandem with one another so each LOD level will share the Light Map Coordinates of each preceding level down to the Base LOD. Assuming your Base LOD has multiple UV channels, you can switch it to the appropriate coordinate index in the static mesh editor.

Thank You

Eric Ketchum

3

Thanks for your replay.However,i have tried to change the lightmap coordinate indexo to 1 and then it automatically changes back to 0.It seems that i cannot change the index in multiple LODs…

4

Hi -

How are you setting up your LODs in your mesh are you importing a single FBX file with an LOD group setup or are you setting up LODs using multiple FBX imports?

Thanks -

Eric Ketchum

5

Thanks for your reply.I used these two ways,and when i import them,then i generate the second uv chanel in the static mesh editor,then i cannot change the ligjtmap coordinaye index to 1 or others. Thanks!

6

Hi -

I am not able to reproduce this error with in house assets, would you mind uploading your single FBX with LOD groups so I can test it? Also, with something like this set up, I would not recommend doing an automatic unwrap through the Static Mesh editor you will loose a lot of control over your edge/seam loops.

Thank You

Eric Ketchum

7

link text
Sorry for the late reply.I upload the 3 lod cars.

8

Hi -

You can change the UV Light map Coordinates if you ensure that each of your LOD levels have a second UV channel assigned to them in a Modeling program.

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Try this instead of trying to use the Generate UV sets which is primarily a prototyping tool.

Thank You

Eric Ketchum

9

thanks a lot!Iwill try to make a second uv in the 3ds max

10

Can we have the engine do this for us in some intelligent way through the editor? Otherwise the easiest workaround is to make your lightmaps in UE4 and export and then reimport the fbx files. Kind of a workaround that can be fixed in the static mesh editor no? Same thing with reimporting a static mesh losing the assignment of the lightmap coordinate index.

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