Pythreejs backend

backends.pythreejs.canvas.Canvas([figsize, ...])	WebGL canvas used to render 3D graphics.
backends.pythreejs.figure.Figure(**kwargs)	Create a figure to represent three-dimensional data.
backends.pythreejs.outline.Outline(limits[, ...])	Create an object that draws a rectangular outline, given some limits for the XYZ dimensions.
backends.pythreejs.scatter3d.Scatter3d(*, ...)	Artist to represent a three-dimensional point cloud/scatter plot.
backends.pythreejs.mesh3d.Mesh3d(*, canvas, data)	Artist to represent a three-dimensional mesh.