I’m using a RenderTarget to generate a simple alpha map using a Cylinder. The Cylinder uses a basic material with color white, which should be fully opaque in the alpha map, per the docs. However, when applied to a geometry, the area corresponding to white in the mask is not fully opaque, as shown in this react-three-fiber example:
The scene setup is:
- Red plane masked to a cylinder via the alpha mask - expected to be fully opaque
- Behind that, a white box - it should not be visible at all from default camera position, but it is.
Anyone have any insight as to why the white alpha mask leaves the Red plane with non-zero transparency (i.e. NOT fully opaque)?