overlay with extrusion not possible

[VNuhaan]

I have a base layer and an overlay layer, both with buildings (fill-extrusions). Since version 40.0 I see extrusions (buildings) from the base layer pointing thru the overlay layer. It looks like that the drawing of extrusions ignores the layering order.

[lbud]

@VNuhaan can you please provide a screenshot or demo of what you're seeing? It's possible what you're describing could be intended behavior: v0.40.0 introduced a breaking rendering change in #5101, after which fill-extrusion layers share the same depth space in order to prevent physics-defying rendering like the left example below:

(This can result in some particular quirks as described in detail at #5288 (comment), wherein layer order can determine which extrusions are visible behind other translucent layers.)

[VNuhaan]

high resolution overlay:

low resolution base layer:

combined:

Maybe it is an idee to combine extrusions of layers that are defined after each other.

[VNuhaan]

Any news on this subject?

I think this behavior is indeed due to this #5101. But now I don't understand the layer order anymore. Fill-extrusions has there own ordering, beside all other types which use the layer ordering. The combination looks weird (picture in last screenshot above).

I was planning to add 3D trains in the near future. But without proper layering order it will end up nothing.

Please make it possible to ovelay fill-extrusions that can be smaller than fill-extrusions of layers below and draw the overlaying smaller fill-extrusions.

[lbud]

@VNuhaan I'm having a hard time seeing the issue in a static screenshot and diagnosing whether this behavior is incorrect. If you can provide a minimal interactive demo (jsfiddle or something similar) that would be helpful. Thanks!