# Weird bug with Processing lights

**URL:** <https://discourse.processing.org/t/weird-bug-with-processing-lights/35803>\
**Category:** Coding Questions\
**Created:** [March 17, 2022, 11:20pm UTC](https://discourse.processing.org/t/weird-bug-with-processing-lights/35803 "2022-03-17T23:20:17Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![SNICKRS](https://avatars.discourse-cdn.com/v4/letter/s/43a26b/32.png) [@SNICKRS](https://discourse.processing.org/u/SNICKRS)\
**Post date:** [March 17, 2022, 11:20pm UTC](https://discourse.processing.org/t/weird-bug-with-processing-lights/35803/1 "2022-03-17T23:20:17Z")

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I’ve been doing some experiments with marching cubes lately, but it was really hard to look at the image as 3d because there were no shadows or lighting. I tried using processing’s built in lights, but I got this weird issue where the lights aren’t grayscale and also shift colors? Here is the bug:

 ![image](https://canada1.discourse-cdn.com/flex036/uploads/processingfoundation1/original/2X/6/6820302a9fddf8c0441de1f97cfe9a60d5209c39.png)

It’s faint, but the lights are blue and I really don’t know what’s going on. Is there any explanation for this?