View source for Planet shader

Here's all the channels from the planet material

# '''_MainTex''' : the planet's albedo
# '''_NormalMap''' : the normals
# '''_PackedMap''' : ?
# '''_EmissionTex''' : emissive texture (i.e. for lava planets), but it doesn't seem hooked up correctly in the shader
# '''_NorthPoleDiffuse''' : specific texture for the north pole
# '''_NorthPoleNormal''' : specific normals for the north pole
# '''_SouthPoleDiffuse''' : specific texture for the south pole
# '''_SouthPoleNormal''' : specific normals for the south pole