# Shadowcatcher mtl giving light?

**URL:** <https://forums.chaos.com/t/shadowcatcher-mtl-giving-light/136627>\
**Category:** General\
**Created:** [April 6, 2017, 8:33pm UTC](https://forums.chaos.com/t/shadowcatcher-mtl-giving-light/136627 "2017-04-06T20:33:50Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![srikken](https://avatars.discourse-cdn.com/v4/letter/s/e36b37/32.png) [@srikken](https://forums.chaos.com/u/srikken)\
**Post date:** [April 6, 2017, 8:33pm UTC](https://forums.chaos.com/t/shadowcatcher-mtl-giving-light/136627/1 "2017-04-06T20:33:50Z")

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Hi

For product shots I often use a HDRI with a (corona color) Shadowcatcher ground for the shadow on a plain background. Because of the great control of background color.

I noticed something strange, did some tests and it looks like the shadowcatcher mtl gives light??  
I have no idea for how long this is, but it doesn’t look good..

What are your thoughts on it, or does someone has a solution?

Attached a simple scene with a shadowcatcher ground, a basic corona mtl ground and my results.  
[Shadowcatcher\_test.rar](https://forums.chaos.com/uploads/short-url/fV2nXY1xhnbqi4pmQPeheeipGjM.rar) (275 KB)

 ![basic_coronamtl.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/d/6/d658c783f11459b436d08c68f0924597795d9d86.jpeg)  
 ![Shadowcatcher.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/c/4/c41133255884188caa5d0455c8257b2382d8160f.jpeg)