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I have many u3d files (nearly a hundred u3d models - some of them are from the internet and some of them are u3d models from PDFs). Around 50-60 percent of the files are rendered without lights in the SamplePlayer (black models on black background): https://imgur.com/a/sWQ3B I am tesing this library for a while now, let me summaryze what I know/tested already: Other softwares: - HOOPS Visualizer and Deep View Exploration softwares are able to show/render the models correctly. So I guess the problem...

I have many u3d files (nearly a hundred u3d models - some of them are from the internet and some of them are u3d models from PDFs). Around 50-60 percent of the files are rendered without lights in the SamplePlayer (black models on black background): https://imgur.com/a/sWQ3B I am tesing this library for a while now, let me summaryze what I know/tested already: Other softwares: - HOOPS Visualizer and Deep View Exploration softwares are able to show/render the models correctly. So I guess the problem...