Using texture to control alpha and not color in texture paint mode

Artistic Support Materials and Textures
1

Hey, everyone, I have been searching the web for an answer to this one for a while and cannot seem to find it. Is is possible to have a brush texture for texture painting that only controls the alpha channel and not the color of the brush? I want to be able to control the color with the color slider in the tools window in texture mode and use the alpha channel of an image I made.

thanks,
amartin7211

2

Using nodes, you could probably do that. First one would be uv vector mapping, then your texture that you are painting, then plug it in to the alpha value, and it should give you some good results. Alpha channel would be functional at a Black and White value, so keep that in mind when you are working on it.

3

I do not know if I understand correctly…

Try this Texture Paint Layer addon
at 3:49 he uses the brush to paint on the alpha channel.
If you want you can create an image to use as texture and paint with that :eyebrowlift:

4

I must not have made myself clear. I thought, in texture paint mode, you can use a brush texture to paint color onto your models and the alpha channel of the channel of the texture determines which part of the texture are painted on or not. The opaque parts of the brush texture are painted onto the model and the transparent parts of the texture are not. However, I want to use a brush texture to only control the transparency of the brush texture and not the color. For example, in photoshop the brushes are not one color. They are just a pattern and you can use the color swatch to adjust the color.

Aericks-I don’t think nodes can be used because brush textures don’t have an output node with an alpha input.
DavideDozza-Not quite. That is painting transparency onto the model. I don’t want to affect the model’s transparency just the parts of the brush texture that actually paint on the model

5

I apologize, I guess I am not completely sure what you are trying to do then. You are saying that you want to paint a texture on, using texture painting, to create an alpha map for your object? Or am I mistaken? Also, are you using cycles, or Blender Internal?

6

Haha it’s ok. I just appreciate the help. Ummm no that’s not quite. I am not sure how else to explain it. I was just looking more for brush functionality like photoshop. Where you can define a brush and use any color for that brush without having to change the brush itself.