SVG path (with fill) to terrain projection

Hi,

my SVG and threejs scene share the same XY-coordinate data but my threejs scene consists of terrain (3Dtile) data. I would like to overlay my svg path on top of the rendered terrain. Does anyone know if I can achieve this?

I found this post from stackoverflow which almost covers my needs…

How this differs my need is that I have a multipoint polygon and I would also like to have fill color for the middle (with opacity) if possible…

Here is sample which I would like to achieve in threejs:
Cesium Sandcastle ← corridors example particularly…

Also found this git repo for the cesium style clamp feature: but this didn’t seem to solve my situation