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HTML5 build fails to launch

Hello I'm having issues launching an HTML5 build on Firefox. This level used to run just fine. I have made quite a bit of changes to it, which are mostly aesthetic in nature. The blueprints and menu widgets are mostly the same. Attatched is the full error report from UE4s browser debug window. Also the java errors reported by Firefox.

I've attempted to delete the cooked data from my project folder and re-cook, close, and re-launch the editor, then launch on HTML5 with no luck. I've re-compiled all blueprints in the level and repeated above steps. The last error messsage concerns me, is my level just too big? It's an interior archviz scene with moderate interactivity, fully static lighting with uncompressed lightmaps and sits at an HTML5 build size of 265mb including all engine files. Which ran smoothly before. Will migrate this project to 4.9 after posting this and see if that will help any of these issues.


Product Version: UE 4.8
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asked Sep 06 '15 at 09:10 PM in Packaging & Deployment

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avatar image Gabriel88 Sep 07 '15 at 12:29 AM

Update, sort of solved. I forced no precomputed lighting and it runs in Firefox now. However I'd like to maintain that level of lighting, any way of editing the HTML5 build to support those big beautiful lightmaps?

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Second update, narrowed it down to compressed lightmaps. It seems HTML5 builds will no longer run uncompressed lighting, although I've read posts of people using 4.8+ uncompressed lightmaps on HTML5 builds. Is there a workaround for this? This scene needs to be the highest quality, even in browser. So I'd love to be able to use uncompressed lightmaps

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answered Sep 07 '15 at 01:00 AM

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avatar image Samantha Sutton ♦♦ STAFF Sep 09 '15 at 03:35 PM

Hey Gabriel88,

I have requested additional information be provided about the most recent changes with lightmaps within HTML5 from 4.8 to 4.9. Please update us on any additional information you've learned if necessary for this issue.

Thanks! :)

avatar image Gabriel88 Sep 12 '15 at 05:53 PM

Hi Samantha,

I was able to have the build work in 4.9 using compressed lightmaps. Not much else I can add other than the error logs posted above seem to have messages completely unrelated to lightmaps, but those messages go away as soon as I check compressed lightmaps. odd

avatar image Samantha Sutton ♦♦ STAFF Sep 14 '15 at 01:49 PM


I'm glad that the errors have vanished from your project once using compressed lighting. Have you ran into any further complications at this time?


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