A demonstration of a possible problem with the 3D Box object.
[attachment=0:2x7arqsq][/attachment:2x7arqsq]
I can see all three boxes without changing resolution...
Which version of Construct are you using? I'm using 0.99.82
I just installed a clean, vanilla version of 0.99.82 and I can confirm that yes, this is broke in 82, but it works in 83. So the issue has been fixed for the next build.
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put the box futher into the next screen then it will show 3 boxes