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With virtual reality, digital painting on 2D canvases is now being extendedto 3D spaces. Tilt Brush and Oculus Quill are widely accepted among artists astools that pave the way to a new form of art - 3D emmersive painting. Current3D painting systems are only a start, emitting textured triangular geometries.In this paper, we advance this new art of 3D painting to 3D volumetric paintingthat enables an artist to draw a huge scene with full control of spatial colorfields. Inspired by the fact that 2D paintings often use vast space to paintbackground and small but detailed space for foreground, we claim thatsupporting a large canvas in varying detail is essential for 3D painting. Inorder to help artists focus and audiences to navigate the large canvas space,we provide small artist-defined areas, called rooms, that serve as beacons forartist-suggested scales, spaces, locations for intended appreciation view ofthe painting. Artists and audiences can easily transport themselves betweendifferent rooms. Technically, our canvas is represented as an array of deepoctrees of depth 24 or higher, built on CPU for volume painting and on GPU forvolume rendering using accurate ray casting. In CPU side, we design anefficient iterative algorithm to refine or coarsen octree, as a result ofvolumetric painting strokes, at highly interactive rates, and update thecorresponding GPU textures. Then we use GPU-based ray casting algorithms torender the volumetric painting result. We explore precision issues stemmingfrom ray-casting the octree of high depth, and provide a new analysis andverification. From our experimental results as well as the positive feedbackfrom the participating artists, we strongly believe that our new 3D volumepainting system can open up a new possibility for VR-driven digital art mediumto professional artists as well as to novice users.

CanvoX: High-resolution VR Painting in Large Volumetric Canvas