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Is there a limit to how many stationary lights affect an object even with no overlap?

I'm adding a bunch of stationary lights to my scene but it seems past a certain amount, additional lights won't render after building my lighting.

As you can see I have no overlap between the lights and the debug stationary overlap disply mode confirms that.

I have 12 similar lights in my level, no overlap. I tried moving them around, they are fine as long as I don't build, but disappear as soon as I do. Could this be a limitation with stationary spot lights?

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asked Jan 30 '15 at 02:00 AM in Rendering

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Hi Jerc,

I've tried to see if I could get the same results, but could not.

In this test I place 25 spotlights, not overlapping, and built lighting:

alt text

Looking at your two images, If you move the light closer to the surface or extend it's radius or cone shape are you able to see any light there? Also, make sure it has a high enough intensity, if it's not set like the three that are working.

Is this after lighting has been built?



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answered Jan 30 '15 at 04:56 PM

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Tim Hobson ♦♦ STAFF
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avatar image Jerc Jan 30 '15 at 05:28 PM

Yes all the spots have the same intensity and color and they are all close enough to the mesh. This is what it looks like before building the lighting:

alt text

The lights do work after the build if I increase their Attenuation radius from 130 to 256, but then the other lights that used to work stop working, and still some of the light with a higher radius are still not rendered.

Eventually, if I increase little by little the radius for all lights that don't appear, it works, this may be an issue with small attenuation radius?

avatar image Tim Hobson ♦♦ STAFF Feb 04 '15 at 10:30 PM

Apologies for the long delay.

The attenuation radius would play into this heavily. So increasing that would give the better results that the light will be within.

I'm not sure what would cause the others to stop working like that though.

Is it only happening in the project or is this something that happens in other projects as well?

Can you post a screenshot of your lights details panel.

In the panel select the eye and set it to "show only modified properties" to show only the relevant information needed.



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There shouldn't be any per-object limit for stationary lights, just the limit on overlapping at any position in space. It might be a bug that you are seeing.

One thing to try if you will - find BaseLightmass.ini and change the value MinUnoccludedFraction=.005 to MinUnoccludedFraction=0

Rebuild lighting and see if that causes all the lights to show up. If it does, we can fix it easily.

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answered Feb 05 '15 at 12:45 AM

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