well, Houska, I'm not sure to understand what you mean!... the diffuse channel has the color information, and is textured all long the snake... Another map, just in black and white, is used as alpha map, to get the beginning of the snake "vanishing", due to the gradient of black... if the snake is a mesh, without bones, it's work fine... If it's rigged, the alpha map in "opacity" channel doesn't work as an alpha (well, doesn't work in any sense)... It's impossible to understand for me!!!