enh(viz): better layer transparency
Description
The following discussion from !760 (merged) should be addressed:
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@eduhamel started a discussion: (+1 comment) I don't know if this is intended behaviour or not, but setting transparency to 100 cuts volume rendering output. Probably a layer problem if it's not.
Proposal
Optional section to give some functional or technical hints
Functional specifications
Typically in the image above, volume rendering should NOT be hidden.
Technical specifications
Details of the implementation
Test plan
Describe how you will verify that the implementation fulfils the specifications