I want to have a straight line following the arrow shape
Any extra node or how can i rotate to fix. Any suggestion. Thanks
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Unfortunately the rim of a Solidified mesh doesn't exist in time to be UV mapped. It has no UV map at all; any texture can only be projected through the solid from the faces that are UV mapped before solidifying, which gives no opportunity to change the colour on the way through.
You have some options:
That's the option that's illustrated here (the copy is not rendered):
It would all depend on how non-destructive you need to be.. which modifiers you might need to leave yourself free to adjust.