Cannot plot color transparency

Dear all,

I would like to plot some rectangles with color transparency.
I am trying to follow the “tutorials/graphics/transparency.C”.
As an example in ROOT, in this link, the ellipses look transparent.
But my output is not transparent (attached file).

I tried with different computers (office desktop, laptop, university server). I got the same issue.
Can someone tell me what is the problem?

_ROOT Version:_6.14/04
Compiler: gcc5.4

It looks to me like you have not set the OpenGL.CanvasPreferGL flag to 1. Try:

root [0] gStyle->SetCanvasPreferGL(kTRUE);
root [1] .x transparency.C 

Thank you Wile.
It works !

Thank you very much!

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