SurfacePlacement

Treat the Z values as absolute altitude values.

Ignore Z values and drape symbols onto the surface, billboarded to always face the camera. In the case of a ModelSceneSymbol, there is no difference in behavior between SurfacePlacement.DrapedFlat and SurfacePlacement.DrapedBillboarded.

Ignore Z values and drape symbols flat on the surface. In the case of a ModelSceneSymbol, there is no difference in behavior between SurfacePlacement.DrapedFlat and SurfacePlacement.DrapedBillboarded.

Treat the Z values as relative to the surface altitude values.

Treat the Z values as relative to the scene altitude values.