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Hello everybody!

I have just spent the last few hours banging my head against the keyboard.

I have finally found the answer, which for whatever reason is never discussed and hard to find in the search. 


When using open GL in the viewport, you have a limit of 20 lights (8 by default).

It is dependent on which lights come up first in the object manager (so the first 8 lights from the top will be visible and then "all" other lights will be cut off).


I was working on a project with many lights 15 + and couldn't understand why most of them turned off at a certain point. 

Then things got even weirder when I started moving the lights around in the object manager and the ones on top would turn on again (usually cinema doesn't care about where your objects are outside of hierarchies).

This was so confusing and aggravating I started to think that my program was glitched. 


Anyway, I just thought I would write this to help anyone else that might be confused and frustrated like I was. 

You can go into preferences and under OpenGL set the maximum number of lights to 20 if you need, or you can turn off openGL in the viewport all together, or use render region on a low setting to see your light setups. 


I hope this information helps. Take care. 



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Further to that, you can still work with hundreds of lights in a scene, just remember to move the ones you need to edit to the top of the OM - Cinema shows the first <20 scanning from top to bottom.



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