Displaying additional layer, respecting height map geometry

[vmirgorod]

I need to displayed additional layer (for example roads) above tiles one. Assuming it should be meshed the same way as tiles layer (respecting to provided elevation data), how i can achieve it?

[mousebird]

At the moment, there's no way to lay a vector layer on top of an elevation layer.

It's possible, certainly, but it would be a fair bit of work to develop.