PolylineVolume does not seem to honor the position’s height when set using a callback property. In the attached image see two polylineVolume entities with the exact same shape and positions. The only difference is that the blue one uses a CallbackProperty.
I assume this is a bug. The constructor options don’t explicitly state that positions supports CallbackProperty. But, it seems that the docs don’t call out when CallbackProperty is supported. For example, polygon hierarchy does support it but the docs don’t seem to call that out.
I’m going to open an issue unless someone can tell me that I’ve made an incorrect assumption or this is an already known issue
This is the example in Sandcastle