3D Game Development in Wolfram Language 

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wolframengine as game engine, wow

Is the notebook available to everyone or just conference attendees?

Nice and useful video, thank you. When using Matlab, I can see the list of variables, change their values and clear any or all of them using user interface. In Mathematica I need to insert a cell for displaying, changing or clearing a variable and then I have to delete that cell. I see some users quit and start kernel for clearing all. You do nice things at Wolfram. I just wonder why you don't put these simple and obviously useful commands at user interface.