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Is it possible in texture painting mode to change the shape of the brush from circle to square? I am using the anchored stroke. As it is, it uses a circle brush and fades the corners of the image texture making it hard for me to make carefully aligned brush strokes. Other strokes that I tried also do this.

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    $\begingroup$ You could use a square mask image $\endgroup$ – gandalf3 Dec 16 '14 at 20:22
  • $\begingroup$ I tried mask images too seen no change if you have specific instructions to follow please provide an answer. $\endgroup$ – Kilon Dec 17 '14 at 14:29
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Blender paints within a circular brush, you can use an image like a stencil when painting to get different shaped brushes.

When you create a image to be used for a brush there are a few things you need to keep in mind. When you have a square image, blender's brush will only paint within it's circle and that circle will be contained within the image dimensions, in practice I would also leave a little margin inside that circle as well.

enter image description here

Anything in the red area will not show in blender's brush, while the green area can be considered a safe zone for brush shapes.

To create a square brush using gimp you can create a 100x100 image and fill it with white then resize the canvas to 200x200 and click the center button then export to png.

Draw the shape you want in white and leave the non-drawing part of the image as transparent and save it as a png. Then in blender create a new brush texture as an "Image or Movie" and select your brush image. The transparent parts show as black in the preview, unlike normal transparent texture previews. You can use multi-coloured images as brushes, the colours will be mixed with the active brush colour based on the blend mode, so white will maintain the brush colours while other colours will tint the brush accordingly. Feel free to experiment with different alpha values for soft edges.

enter image description here

Texture masks work in a similar way but they don't mix colours like a texture brush, any colour info will only be used as a greyscale mask for the brush.

To get a crisp edge you will want to give the brush a sharp curve, this can easily be set by clicking the square preset button at the end.

enter image description here

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  • $\begingroup$ Only want to add that instead of going out of blender, you can set up a new scene with a top down camera in orthographic mode and render a cube set to shadeless material. I also recommend using images that are closer to 1024x1024. $\endgroup$ – Craig D Jones Jan 31 '17 at 14:44

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