Linear transformation in 3D graphics can be tricky, here is as “Matrix Cycle” that should help to better understand transition between spaces. The tricky part is actual numerical representation (or direction) in the transformation matrix. Some info about also here (nice notation of actual numerical matrix direction) nice online demo here
Recent weeks I have been working on the concept code named ‘Impact IN’ where I could apply few interesting ideas of the modern, interactive 3D geospatial analysis. The core 3D functionality and viewshed analysis is provided by myVR SDK . While this concept is demonstrated on iPad Pro with iOS , myVR SDK is truly multi-platform SDK so this can be run on any platform (Android, Web, Desktop, it runs even on Daqri helmet!). I have used Apple Pencil to navigate directional viewshed and to drive fly-through on 3D map – it works like joystick. Another concept shown here is the real-time transition of the analysis from 3D to 2D – so while user interacts with the viewshed on 3D city model of London , it is at the same time reflected on 2D map, creating thematic map of the impacted areas – a classic GIS result that can undergo further analysis in a GIS system of choice, or better go directly as input into the Smart M.App (e.g. into Studio or Grid Analysis)…. following video is what attendees could see at HxGN Live 2017 . [will continue next time]
Here is a project I have been working on iKatastr2 (SpatialReader) with myVR technology showing terrain model with overlays of OGC WMS services. All from freely available data. Presented at HxGN live 2013
at 39:10 watch myVR multiplatform rendering technology integrated in the mobile app for 3D map visualisation.
Here are also few pictures form HxGN live booth/keynote