Turning on point cloud rendering effects disable support for transparent backgrounds

Summary

Turning on any visual rendering effect loses the transparent background.

Steps to reproduce

1. Open the transparent_background example
2. In the inspector, turn on any point cloud effect (under Instance > Visual parameters)

Expected behaviour:

The canvas background becomes black.

Actual behaviour:

The canvas background remains transparent.

Informations

• Giro3D version: 0.34
• Browser (Firefox, Chrome, Opera, Safari...) and version: N/A
• OS (Linux, MacOS, Windows...) N/A

Screenshots

transparent_background_issue