Momodot,

A few practical considerations.

In the snow shader, I am using the alternate diffuse, so it doesn't replace the texture underneath. I am replacing the bump and displacement, because snow will cover the bump and displacement of whatever is underneath.

So if I make dirt it has to be in the alternate diffuse, so as not to replace the original texture.

Now, I can control the direction, and height of what I am adding to a material. In the snow, I am using direction, all the surfaces facing up get snow. In another version of the snow shader I made, I also control the height, so that snow only occurs from a certain height up, like on a mountain, which is not very practical for Poser, that is more what you would need in Vue.

I can add mud to the bottom of things, such as saying that everything below a ceratin level must get some mud, such as wheels going through mud, but also not very practical. I know there is a way to add dirt using the gather node that someone else worked out, but I am not sure how far they got, I will search for the thread and see if I can find it.

Your specialist military, sci-fi, historical and real world site.