# Shadow catcher solution, (matte) workaround in Corona A6.

**URL:** <https://forums.chaos.com/t/shadow-catcher-solution-matte-workaround-in-corona-a6/127422>\
**Category:** Tutorials & Guides\
**Created:** [March 20, 2014, 4:08pm UTC](https://forums.chaos.com/t/shadow-catcher-solution-matte-workaround-in-corona-a6/127422 "2014-03-20T16:08:58Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![borisquezadaa](https://avatars.discourse-cdn.com/v4/letter/b/b2d939/32.png) [@borisquezadaa](https://forums.chaos.com/u/borisquezadaa)\
**Post date:** [March 20, 2014, 4:08pm UTC](https://forums.chaos.com/t/shadow-catcher-solution-matte-workaround-in-corona-a6/127422/1 "2014-03-20T16:08:58Z")

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Just came with this idea for a shadow matte o shadow catcher.

1.- First render your scene as usual (i use an hdri and a crane model i’m working on).

2.- Assign a default white material to all geometries that needs to catch shadows ( in my case… just a plane).

3.- In Corona render settings assign a material override with a black corona material to all scene assets except the geometries you want to catch shadows.

4.- Add a CShading\_shadows render element. As i noticed, ou can compose the “inverted” shadow pass (Ctrl+i with the layer selected in photoshop) later in “multiply mode” over the beauty pass.

 ![beauty.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/8/a/8a80e444eaa86972692e713bae3982aedd7a5e37.jpeg)  
 ![SETUP.JPG](https://europe1.discourse-cdn.com/chaosprd/original/3X/d/8/d8da2a6b1c749838b51c9d77bf7187e73fb3cded.jpeg)  
 ![BLACK OVERRIDE.JPG](https://europe1.discourse-cdn.com/chaosprd/original/3X/4/d/4dc4896ff950c62814ac2eb72f8b0b295f98d573.jpeg)  
 ![CShading_shadows pass.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/7/b/7b2bacf37ed38dfa5e95f49818253975e5181b24.jpeg)  
 ![Photoshop comp.JPG](https://europe1.discourse-cdn.com/chaosprd/original/3X/2/4/249aa23e30d4b7f7273d196b3a46a9f1a52a60eb.jpeg)  
 ![beauty_shadow.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/3/b/3bed1ee07568d218beb0c5fbf7e94597cc668472.jpeg)

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<div class="post-metadata">

**Author:** ![borisquezadaa](https://avatars.discourse-cdn.com/v4/letter/b/b2d939/32.png) [@borisquezadaa](https://forums.chaos.com/u/borisquezadaa)\
**Post date:** [March 20, 2014, 4:14pm UTC](https://forums.chaos.com/t/shadow-catcher-solution-matte-workaround-in-corona-a6/127422/2 "2014-03-20T16:14:49Z")

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Just came with this idea for a shadow matte o shadow catcher.

1.- First render your scene as usual (i use an hdri and a crane model i’m working on).

2.- Assign a default white material to all geometries that needs to catch shadows ( in my case… just a plane).

3.- In Corona render settings assign a material override with a black corona material to all scene assets except the geometries you want to catch shadows.

4.- Add a CShading\_shadows render element. As i noticed, you can compose the “inverted” shadow pass (Ctrl+i with the layer selected in photoshop) later in “multiply mode” over the beauty pass.

 ![beauty.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/8/a/8a80e444eaa86972692e713bae3982aedd7a5e37.jpeg)  
 ![BLACK OVERRIDE.JPG](https://europe1.discourse-cdn.com/chaosprd/original/3X/4/d/4dc4896ff950c62814ac2eb72f8b0b295f98d573.jpeg)  
 ![CShading_shadows pass.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/7/b/7b2bacf37ed38dfa5e95f49818253975e5181b24.jpeg)  
 ![SETUP.JPG](https://europe1.discourse-cdn.com/chaosprd/original/3X/d/8/d8da2a6b1c749838b51c9d77bf7187e73fb3cded.jpeg)  
 ![Photoshop comp.JPG](https://europe1.discourse-cdn.com/chaosprd/original/3X/2/4/249aa23e30d4b7f7273d196b3a46a9f1a52a60eb.jpeg)  
 ![beauty_shadow.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/3/b/3bed1ee07568d218beb0c5fbf7e94597cc668472.jpeg)

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**Author:** ![contaxx](https://avatars.discourse-cdn.com/v4/letter/c/e36b37/32.png) [@contaxx](https://forums.chaos.com/u/contaxx)\
**Post date:** [April 3, 2014, 12:37am UTC](https://forums.chaos.com/t/shadow-catcher-solution-matte-workaround-in-corona-a6/127422/3 "2014-04-03T00:37:27Z")

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nice I will try it tomorrow 😃  
but would be nice to have away without rendering 2 times, the state editor can be pain in the …