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Below on the left is the bearded axe's bloodmask, on the right is the diffuse texture. The Bloodmask is overlaid ontop of the other textures. Pixels that are white in a colour's channel will turn into blood, black will remain unchanged. By clicking the link below you can download a template that is set up to let you quickly create an RGB mask. I will be using it myself in this tutorial.
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Preparation
You could create your blood splatters several different ways, I'm going to show you how you can do it using splatter textures from http://www.cgtextures.com/
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