FeatureCollection: vertical polygons (in the YZ plane) are not displayed

Summary

When loading a feature whose geometry is a polygon that sits on the YZ plane (e.g a perfectly vertical wall), then the surface of this feature is not displayed.

This is due to the fact that the earcut algorithm that Giro3D uses only work on the XY (horizontal) plane.

See Piero issue: 3D GeoJSON not rendering properly (piero#70 - closed)

Steps to reproduce

1. Look for the reproduction steps in the Piero issue.

Expected behaviour:

The vertical polygons are displayed.

Actual behaviour:

The vertical polygons are not displayed.

Informations

• Giro3D version: 0.39
• Browser (Firefox, Chrome, Opera, Safari...) and version: N/A
• OS (Linux, MacOS, Windows...) N/A

Screenshots