How to rotate 90 degrees the Texture Sample?

you just need to swap x and y TexCoords for that

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Hi, I know this is kind of a dumb question but how could I find that yellow node (0.5, -0.5)??

That is a Constant2Vector node. Just press 2 and left click to create one.

Thank you!

thats the important takeaway if anybody still wonders why it is not working

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0.5 is a 180 degree rotation. 0.25 is 90

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