What can you do with Qt Quick 3D right now?
. Create a QML application that features 3D content
. Load models made in 3D studio max or Blender into your app
. Add stock shapes such as cylinders and cubes
. Insert inline shader code into the QML to create neat effects
. Animate your scene with geometric animations such as rotate, translate and scale
. Control your scenes with QML states, transitions and animations
. Write app logic in javascript, and use Qt Quick 2D alongside your 3D content
The documentation and examples are here.