Hi, I have a few miscellaneous questions regarding the Shapeways API, which I'm using to upload models from my mobile app. - It appears when I upload my model from my app and visit the resulting model's page in Shapeways, the "description" property, "markup", etc. appear fine, but "tags" appears empty. The value I give in my request is the following comma-delimited list: <tags>egg,easter,painting,magic 3d easter egg painter,subvs,subversus interactive,iphone,ipad</tags> Is there anything more I need to do to get those tags to show up? - In a related question, is there a way to specify the "categories", "shop section", or preview photo through the API? Will there be a way? - Is there a recommended way to construct the URL given the model's ID? I've noticed sometimes the following format results in a "Redirect Loop": http://www.shapeways.com/model/846755/ The following format seems more reliable: http://www.shapeways.com/model/846755/.html Is there a format we should adhere to that will be guaranteed to always work? - Is it possible to ask submitModel to send its response after the model has been processed? Directing our users to a URL that says "Rendering Image..." in place of the preview image is confusing. Currently I just wait 30 seconds after receiving the model ID before directing them to the URL, but I was hoping there's a better way. - What is the meaning of properties such as specular_color, shininess, opacity, translucency, etc on MaterialArray? I understand these concepts in the context of 3D computer graphics but with real-world objects and light sources, how can these properties affect appearance? Thanks!