@raevn, some information to add, courtesy of bgolus! The distance field is an alpha for the diffuse, not the mask. This is generated using the edge glow filter in photoshop, followed by using the 'outer glow' layer effect with the technique set to 'precise'. The blue channel in the material texture is for defining which areas are dielectric (white) or metallic (coloured from diffuse) specular; areas greater than 127 blue being metallic and visa versa. I know this has been mentioned elsewhere in the forum, but might be a good idea to add it here, the model needs to have all 'sharp' edges be split - contiguous meshes are rendered as smooth in the PA engine.