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I have a question about the Brush&Strip Alpha.

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I've been seeing stuff like this every time I mouse over Alpha in the Brush and Strip panels.

So I recently decided to look into it with interest and try to make it myself.

Looking at the wiki (link) and the existing internal alpha images, I have a few questions while making it.


1.What exactly does EraseMask do?

I've looked through the wiki and tested it around but I still don't know what exactly this is.
Can you give a more detailed explanation?



2.It seems that the brush's alpha source takes precedence over the strip's alpha source.



Obviously, the wiki says that the Strip's alpha source is prioritized, but in reality, it seems to give priority to the Brush's alpha source.



Only the color of the strip appears properly
The rest of the data is ignored.

Here is the alpha source I tested.




+Edit )
I forgot to add it to the content when using it as a brush alpha.

Brush Alpha works as expected.
But Strip doesn't.


Are the settings wrong? Or is it a bug? :huh:


Due to this problem, it seems that it is difficult to express a zipper line that contains metal materials.


Edited by Yousung
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You are right, the information was wrong, it is already corrected. Thanks !

Erase channel is useful to create decals as example

Layer1: green background

Layer2: decal applied


  1. Erase Mask: This layer is used to create alphas that ignore certain values, in other layers, while painting. Remember that this mask affects the lowest Layer in the list.
  2. decalChann.jpg
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  • 6 months later...

Hope this help


On 1/17/2016 at 12:41 PM, digman said:

1: Create a folder to place your alphas in, your choice of location on your hard drive.

2. Create your alphas in Photoshop or another paint program. Save the alphas to your created folder. This acts as storage folder.

3:Open 3DC, go to the alpha panel and select the Folder icon with the + symbol, create your folder and name it.

4. Select New in the folder, then open texture file.  Not only can you open a texture file but an obj model as well to be used as an alpha.

5. Select your alpha.


6. Your alpha is stored internally in the C:\Users\username\Documents\3DCoat\UserPrefs\Alphas folder of 3DC.

Done and now you have your user created alpha folder, which also can be shared as a extension.


The video though old is still the way it works... I will share for others to view.




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