I have built a model using ArcScene by draping 2D polygon data over an elevation raster and am having issues when using the Export to 3D Web Scene tool. The tool builds successfully, but when I view the model using the CityEngine web viewer the center of donut polygons get filled with gray which ends up covering the interior polygons. See images below for an example of what I am talking about. If I cut the donut polygon into two then the issue goes away, however this isn't really feasible to do for my entire model. I am hoping that someone may have a suggestion of a tool or setting that I should try. I am new to the 3D mapping world so please bear with me .
Here is what is being hidden by the darker gray "filled" donut hole.
Can you try adding extrusion to the polygon feature layer? Extrusion can be set on Layer Properties > Extrusion tab.
Set extrusion to a small value such as 0.01m, save your SXD and export to web scene using the GP tool. Now the holes in the polygon features should display as expected in the web scene.