3D obj file modification on the fly

I need to develop an iPad app that would take an obj 3d file (a mesh), automatically identify a structure in it, and modify its properties as volume and format, and calculate its volume based on a calibration measure provided. The app should work on iPad, open obj files as provided, do its modifications (with pinch gestures), allow a 3d navigation of the object for view, and a picture export. The obj files have texture. This first version is a proof of concept, and should be improved in the future. I believe the best solution for that would be a game engine like Unity or Unreal. Full description The app will be a breast enhancer previewer. A torso, or thorax in a 3d file obj with texture will be loaded. Example attached. [login to view URL] This torax can be viewed as is in the viewer window, rotated and zoomed. App should detect breasts and nipples automatically, or accept a manual pinpoint. ([login to view URL]) To automatically detect, just get the 2 most proeminent points in the 3d object, horizontally. Then, selection of the breast could be done manually, to define its limits. A measure between each nipple should be used as calibration. After that, format of the breast enhancement should be selected, initially we will use only oval. Then a pinch movement would increase breasts sizes and reduce it, also calculating volume, and volume difference from original. You need to be available in the future to do upgrades All source code will be mine. I need all the files ready to be published in Apple Store, no dependency. And full help to manage that ( I already have a developper account and other Apps). I will not give access to my itunesconnect account, and everything that should be done in the server, I will do it myself following instructions. Need a ready to publish version I will only answer to bidders that put AMATO on the bid (to avoid spammers and those who didn\'t read the project at all) Please ask all you need before I accept your bid I may need minor changes in the main idea