VideoTexture on 3D Object - Problem Appear Transparent

Questions
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3

Maybe these examples from the Collection of examples from discourse.threejs.org will help?

BeginnerExample step4

RoundedRectangleVideo

Video

https://hofk.de/main/discourse.threejs/2018/VideoTextureProjection/VideoTextureProjection.html

https://hofk.de/main/discourse.threejs/2018/VideoProjector/VideoProjector.html