I 3D modelled the Mac pro as I thought it would be a good model to create something realistic, as well as model something with a complex shape, mostly in the grill front and ports.
The original model had the grill front as geometry, but this skyrocketed the poly count to near the hundred thousands, so I've used a different approach in the use of parallax occlusion mapping.
Marmoset and Sketchfab don't use Parallax Occlusion Mapping (to my knowledge) so added these models to Unity, and you can view these models on my Itch.io with the project running in WebGL
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https://mldanny.itch.io/apple-model-showcase
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