Multiply a texcoord node with sine/cosine. Some additional parameters (add scalar to sine, multiply sine by scalar) will help to adjust the final results for your needs.
I did it and it works nice but another problem is that it is zooming at 0,0 coordinate but I need to zoom in the center of image. Do you know how to fix it, please ?
Black magic ! Thank you guys, redbox's solution worked. mAlkAv!An's solution worked only partially because it was like mirrored. btw Problem solved. Thank you another time...
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