On Mon, 25 Jan 2021 at 07:39, mirr...@gmail.com <mirro...@gmail.com> wrote:

> Thank you very much, but this method only works for four point texture
> coordinates

You provide so little information about the context about what you want to
do folks are left guessing what might be appropriate.

For instance, are you wanting to physically modify the image data so it's
rotation 180?

Or are you just wanting to modify the texture coordinates of your geometry
so the texture appears 180 different?

How to do both are completely different.  Which is appropriate for your
case we have no clue.
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