PointCloudMaterial: opacity does not work

Summary

Steps to reproduce

1. Open any example with a point cloud
2. Open the inspector for the point cloud entity
3. Change the opacity

Expected behaviour:

The point cloud's opacity changes.

Actual behaviour:

The point cloud's opacity stays the same.

Informations

• Giro3D version: v0.33+
• Browser (Firefox, Chrome, Opera, Safari...) and version: Chrome
• OS (Linux, MacOS, Windows...)

Screenshots