The successful transparencies I've seen (for instance when I import a Poser Figure using Transposer2), do something, if I recall correctly, like this: The shader is a mixed channel shader. Source 1 has the head texture in it in the color component. Source 2 has a mixer and in the first part in the color comp. is the transparency map and in the blender channel in the transparency action and it's slider is slid to 100%. I'll check if it's otherwise, but transparency works something like that in Carrara.