What are some alternatives?
When comparing Tilt Brush by Google and Snap Art, you can also consider the following products
SprayPrinter - Convert digital designs into wall art from your smartphone
Apple ARKit - A framework to create Augmented Reality experiences for iOS
MasterpieceVR - Powerful VR sculpting & painting tool
Made With ARKit - Hand-picked curation of the coolest stuff made with ARKit
VR Sketch - A tool for designers to draw inside virtual reality
SketchAR - Start drawing easily using augmented reality