# Where to place Opacity map of decal?

**URL:** <https://discourse.mcneel.com/t/where-to-place-opacity-map-of-decal/129062>\
**Category:** Rendering\
**Tags:** windows\
**Created:** [August 21, 2021, 3:18am UTC](https://discourse.mcneel.com/t/where-to-place-opacity-map-of-decal/129062 "2021-08-21T03:18:22Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![travis.designer.vn](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/travis.designer.vn/32/476395_2.png) [@travis.designer.vn](https://discourse.mcneel.com/u/travis.designer.vn)\
**Post date:** [August 21, 2021, 3:18am UTC](https://discourse.mcneel.com/t/where-to-place-opacity-map-of-decal/129062/1 "2021-08-21T03:18:22Z")

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Hi

 ![Decals_ujznddlv_atlas_Preview](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/6/1/b/61b27697941b721fb5c19d850f5e4238e32b60e7.jpeg)  
I download this decal on Megascan website. There are Albedo and Opacity Map. I’m intent to place this decal on a wall, It mean need wall material and decal.

I select object then select Decal tab, I only can place Albedo map, where could I put Opacity map?  
Or other method to create Decal in Rhino 7?

Attached file  
[Decals\_ujznddlv\_2K\_atlas\_ms.zip](https://discourse.mcneel.com/uploads/short-url/c7aI1OhbQLl0mANVmWrbFEL1yiB.zip) (1.6 MB)

Thank  
Travis

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**Author:** ![nathanletwory](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/nathanletwory/32/482880_2.png) [@nathanletwory](https://discourse.mcneel.com/u/nathanletwory)\
**Post date:** [August 21, 2021, 5:44am UTC](https://discourse.mcneel.com/t/where-to-place-opacity-map-of-decal/129062/2 "2021-08-21T05:44:23Z")

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Combine them in your favourite image editor and save out as PNG with alpha channel.

For instance with GIMP:

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/7/d/b/7db993702c1b2311d6b987343269473933e8ea64.jpeg)

 ![The edited decal](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/3/c/3/3c31a13476b8dac0754b86be4c310793e48d25aa.png)

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/0/d/3/0d3c4a817e85fbd4701a8197349db099c72b3f4e.jpeg)

Addendum for a bit more control over the texture if the decal is the only texture you’re going to have:

> [@Emboss a signature on glass](https://discourse.mcneel.com/t/emboss-a-signature-on-glass/124879/3):
>
> If you look to do this just for rendering, I’ve just uploaded a video of how you could do this: [[Texture mapping logo on bottle - Rhino 7] ](https://www.youtube.com/watch?v=4CCQZdLADLM)

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<div class="post-metadata">

**Author:** ![travis.designer.vn](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/travis.designer.vn/32/476395_2.png) [@travis.designer.vn](https://discourse.mcneel.com/u/travis.designer.vn)\
**Post date:** [August 21, 2021, 10:17am UTC](https://discourse.mcneel.com/t/where-to-place-opacity-map-of-decal/129062/3 "2021-08-21T10:17:38Z")

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Thank Nathan for advices  
I did it

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/b/4/3/b43e4bba24fb6701ef91ecfa705ae938060c59da.jpeg)  
I found this guide for photoshop  
[How to merge opacity map to diffuse map as alpha channel - YouTube](https://www.youtube.com/watch?v=m-Fm-ZFnCUg)

Travis