Lighting Build Taking Long Time (4.7.3)
I created a Third Person Project and after it loaded I clicked the build button. The Lightmass swarm starts up as it normally does but it is taking a little over two minutes to complete the build. This is a drastic change from 4.6. In 4.6 the build takes about 10 seconds. I even tried creating a new project thinking something was wrong with the one I made and got the same result. Below is what the build looks like. Does anyone know if something changed to cause this long build time?
asked Mar 19 '15 at 06:15 PM in Rendering
I've not noticed this kind of drop on my end. Would you mind sharing your DxDiag along with the swarm agent log from 4.6 in comparison with 4.7?
If we have a machine here with similar specs I can possibly compare and see if there is a significant difference. On my machine here (which is pretty top end) and my machine at home (Mid-range at best) I've not noticed this behavior.
Let me know.
answered Mar 20 '15 at 09:38 PM
Tim Hobson ♦♦ STAFF
I can confirm this bug.
Reproduction: start a new project, use template ThirdPerson Blueprint, hit 'Build Lightning Only'.
Issues: building of lighting takes more than 3 minutes instead of 1-2 seconds; lightmap has a wrong density.
Issues start here:
Workaround: set LightingInfo->LightMap Resolution Ajustment -> Ratio to about 10, build Lighting, then reset Ratio to 100 (or more).
Okay. I have a partial answer. I can share the difference between 4.61 and 4.73.
Third Person blueprint for 4.61 uses all bsp brushes as far as I can tell. The lightmap resolution doesn't exceed 16 for those brushes.
In 4.73. The lightmpa resolution for the walls and floor are 1024 and 2048 respectively. Plus the walls and floors are all static meshes.
Looks like Epic either needs to do some more work on optimizing lightmass for static mesh actors, in order to improve the shadows, or it's a good idea to keep BSP brushes in your toolbelt for the time being.
answered Apr 02 '15 at 04:45 AM
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