What are some alternatives?
When comparing Tilt Brush by Google and Blocks by Google, you can also consider the following products
Snap Art - Snap's augmented reality platform
SprayPrinter - Convert digital designs into wall art from your smartphone
ScrollMagic - The jQuery plugin for magical scroll interactions.
MasterpieceVR - Powerful VR sculpting & painting tool
Volupedia - A Wikipedia mirror powered by Sketchfab 3D previews
VR Sketch - A tool for designers to draw inside virtual reality