Sometimes the object of the exercise is not to create a 3D model, but what kind of surface material one can apply to it. In 3D Graphics games, the choice is usually more limited than with Bryce. One of my interests is 3D or 'VR Game' Design with 3D Game Studio. But the new version of 3DGS, their A6.22 version, allows procedures to be written which run directly on the graphics card, called vertex shaders and pixel haders.
I applied this material to the model of a player game entity, but more practically it could be used for animals in future games, as well as for terrain which is supposed to be grassy, but in the different colour. Therefore it's important to me that ths effect can be adjusted without having to be reprogrammed.
You may download my .fx file to use in your own applications. However it would be up to you to adapt the file. It has been backwards-designed for DirectX 8.1 , and therefore imports numerous variables from my 3D Game Studio script which you need to supply. Most importantly, you would need to specify a texture map, called "mtlSkin1" in the .fx file, which provides scratchy lines and an important alpha channel, as a basis for producing a fur effect. The size of this file needs to be a power of two pixels in each direction, such as 512x512 or 256x256 pixels.
My .fx file has 2 fallback techniques for weaker graphics cards, but the main technique makes 14 passes over the model to achieve this effect.