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How to change Lightmap resolution for another LOD?

Hi, can i change lightmap resolution for LODs? Example, on LOD0 i have 128 lightmap res, and i want to set 32 for LOD1. Can I do this?

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asked Jun 23 '14 at 09:20 AM in Rendering

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I'm not completely sure of this, but I believe that lightmaps are already mip mapped (e.g. larger lightmaps textures are used only when you are close to the object, and lower resolution copies when you are fare away). This has definitely an impact on memory occupation, but the lightmaps baking time in any case is only affected by the highest resolution of each map.

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answered Jun 23 '14 at 12:42 PM

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avatar image BorodMorod Jun 23 '14 at 02:55 PM

If object have two LODs, and light map for each LOD, lightmapping data increase final build size? But if i have 5 LODs? :) Lightmap data for it object increase 5 times?

avatar image devel.bmad Jun 24 '14 at 09:34 PM

From this thread [https://answers.unrealengine.com/questions/53794/why-cant-i-change-lightmap-coord-index-when-having.html] I would say that the lightmap is just one across different LODs (at least, the UV unwrap is the same, it wouldn't make much sense if the lightmap was different). I would anyway recommend to check the statistics window to get more information about this. You can also check the number of lightmaps in the world settings panel, expanding the lightmass section. One easy test would be to check this before and after adding one LOD. Also, from the lightmass section, I see there are HQ and LQ lightmaps, so probably there is not a real MIP mapping here but just this two levels (which make sense, since lightmaps are at a very low resolutions to start with) Hope this helps!

avatar image BorodMorod Jun 25 '14 at 07:04 AM

Thanks for your reply ;)

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