Hi Philippe! I was testing all extensions of this repository. Do you know how to create a file with asociate information about model loaded in viewer? With this extensión I want to add, modify and delete parts of model and agregate other properties like material? Workflow I want is: 1) Load model in viewer. 2) Load my panel extension. 3) Click to create .json info 4) Click to add part of model to my .json info. This info to agregate is from click in part of interest. 5) ok or modify info before to agregate this info. 6) This panel would let download or modify this .json info. Could you help me? Some extensión how have related information to try to do this are: BootStrap Panel --> To create panel. Geometry Selector --> To get info of interes part of my model. Riot Panel --> To add and delete info Thanks and best regards.