Make sure you are in edit-mode.

Highlight the texture area that you want to be scrolling
Press the console command key " ~ "
type
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/vscroll 1 and press enter.
you can also increase the speed ex:
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/vscroll 10Code: Select all
/vscroll 20Also if you want to change the direction type in
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/vscroll -1Note: the player don't get effected by scrolling texture.

