Patch : Overlapping geometry , chessboard colors.

I want to fill the area with only one color : white. I'm using patch. But it's leaving transparent area where it overlaps . How do I make all the same color ?

[DGM]

If you want someone to troubleshoot the code you wrote, you'll have to attach the code you wrote, or at least an example that demonstrates the problem.

[Benjamin Kraus]

Is this the same as this question? You can update an existing question. There is no need to post a new question with new details.