Window showing 'ghost' of previous runs

I’m writing using simple Walker code ( and every time I run it, it shows the previous run slightly transparent and flickering. If I convert the code to be an animation and call clear in the draw loop I don’t have the same issue.

I had a friend try the code and it works fine for him so maybe it’s a driver issue?

I tried your code and it works fine for me. I would try setting the viewport and matrices in draw, but it should not be necessary, I think.

Do the Cinder examples work for you?

What do you mean “convert the code to be an animation”? Can you also post the code that works as you expect?