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I want to paint snow on top of a material and I found that vertex paint combined with an attribute node and a mix shader will allow me to mix two materials with what I paint in the vertex paint mode. Is there any way to change the brush type, something other than a circle?

Or, is there a way to mix materials, or even just paint white over another material, with the texture paint tool? I tried a mixing the material with a transparent texture and painting on top from there, but no luck.

Any help would be great, Alan

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  • $\begingroup$ You can change brush profile to make it e.g. square in any mode as explained here Note though that in Vertex Paint brush stroke will mostly depend on topology (how many vertices does the mesh consists of). It might be more efficient (not necessary) to texture paint a mask. Paint an image as usual, and plug it into the MixRGB / Mix shader node to mix 2 materials / images / whatever. $\endgroup$
    – Mr Zak
    Commented Feb 26, 2017 at 23:59

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Yes, you can use textures to serve as a brush. Here's what you do.

Make or find a brush texture. I quickly drew one in GIMP. As far as I know, the color of the brush doesn't matter, just the alpha channel. That means you can play with brushes that fade towards the edges, etc.

In the texture panel, add a texture as an image and assign your brush image to it. Make sure Use Alpha is checked! See image below: enter image description here Now you have a texture available that will serve as a 'brush'. Back in the uv editor you can start painting. Expand the Texture panel below the brush settings and click on the big checkerbox button. Select your texture and you'll be able to paint using the texture as a brush. Note the Brush Mapping drop down. In the image below, I used Tiled, View Plane, and Random. I assume you'll probably want View Plane to start. enter image description here

Two cool things:

I like the Rake feature. It will rotate the brush depending on the direction you're painting. Awesome!

I haven't tried this yet, but you could probably paint a texture in Blender and then use it as a brush. Now that's Meta!

P.S. I made this fur texture thing using that brush (for demonstration purposes) enter image description here

P.P.S I am not a texture artist.

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