The radius of the sphere adornment in studs.

Shading selects the material and render pass used to draw the sphere, via AdornShading. It defaults to AdornShading.Default, which draws the sphere unlit and occluded by scene geometry like an ordinary world object.

AdornShading.Shaded and AdornShading.XRayShaded light the sphere with the scene's lighting instead of drawing it unlit, while AdornShading.XRay and AdornShading.XRayShaded draw the sphere through geometry that would otherwise occlude it. AdornShading.AlwaysOnTop draws the sphere on top of everything else with no depth testing.

The legacy HandleAdornment.AlwaysOnTop property only takes effect while Shading is AdornShading.Default; any other Shading value determines the render pass on its own.