Based on my answer to this Stack Overflow question: http://stackoverflow.com/questions/20167239/how-to-mix-css3-transform-properties-without-overriding-in-realtime ...
glTF Transform supports reading, editing, and writing 3D models in glTF 2.0 format. Unlike 3D modeling tools — which are ideal for artistic changes to geometry, materials, and animation — glTF ...