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malkia wrote:
> I think the problem is that "x" and "y" are nil, not that color is of
> the wrong type.

Yes, that would be my guess, too. I've just pushed some changes to
improve the error messages:

  cannot convert 'void *' to 'int'

  bad argument #1 to 'glReadPixels' (cannot convert 'nil' to 'int')