# Rectangle Light Uneven

**URL:** <https://discourse.mcneel.com/t/rectangle-light-uneven/187874>\
**Category:** Rhino for Mac\
**Tags:** mac, rendering, light, rectangle\
**Created:** [July 11, 2024, 3:53am UTC](https://discourse.mcneel.com/t/rectangle-light-uneven/187874 "2024-07-11T03:53:46Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Media\_Sarsfield](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/media_sarsfield/32/644679_2.png) [@Media\_Sarsfield](https://discourse.mcneel.com/u/Media_Sarsfield)\
**Post date:** [July 11, 2024, 3:53am UTC](https://discourse.mcneel.com/t/rectangle-light-uneven/187874/1 "2024-07-11T03:53:46Z")

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Hi team,

I am currently doing some rendering using the rectangular Light tool. I have been using two different computers and have noticed a difference in rendering.

As you can see below, there are two similar images where the light is in the same location.

I am noticing that in one, the light is diffusing smoothly whereas the other, a curve is appearing. The only difference I can see is that in the curve one, there is a note saying "Using optimised intersection kernels). However, I am unsure if this is a cause and I cannot find anything relating to this. If I had missed this, please kindly redirect me.

 ![Screenshot 2024-07-11 at 3.52.40 PM](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/d/6/e/d6e48db54cc70bc2a4ff81e25615d5560811dfa4.jpeg)  
 ![Screenshot 2024-07-11 at 3.52.48 PM](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/e/8/6/e8684cd3c8f7b93e4888917ff7a3d043d38b94a4.jpeg)

As always, thanks for your help in advance.

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**Author:** ![Gijs](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/gijs/32/769882_2.png) [@Gijs](https://discourse.mcneel.com/u/Gijs)\
**Post date:** [July 11, 2024, 10:15am UTC](https://discourse.mcneel.com/t/rectangle-light-uneven/187874/3 "2024-07-11T10:15:13Z")

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@Media_Sarsfield pls send the file for inspection, it’s impossible to debug this without a file that shows the issue. You can send the file [here](https://www.rhino3d.com/upload)

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**Author:** ![Gijs](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/gijs/32/769882_2.png) [@Gijs](https://discourse.mcneel.com/u/Gijs)\
**Post date:** [July 12, 2024, 1:18pm UTC](https://discourse.mcneel.com/t/rectangle-light-uneven/187874/5 "2024-07-12T13:18:03Z")

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@Media_Sarsfield thanks for sending the file

I suspect that this will help:  
Set the falloff of the light to inverse square, and change the intensity to 3000 to start with:

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/7/9/9/79950e43a3880727ca28fbbc378bc5db22892c07.jpeg)

btw: your side tables are floating