Mike,

Sorry for the late response. There's no perfect way out of this problem. Our 3d pie chart does have some label anti-collision algorithms in place, but so far they don't work in all cases. In many cases, it's enough to slightly change the chart's rotation throught the Transform3D property. A more involved way is to handle FillSceneGraph and collect all Text primitives by looping through the SceneGraph. Once you have the texts, you can see if their bounds collide and if they do, manually adjust them.