Arrow Texture animation

[saeeddameeres]

Hi 

i have a lot of pipes and i need to show the direction of water by Arrows Texture 

so how i could animate the texture like that from beginning of the pipe to the end of the pipe?

and thanks 

[mcw0]

Are you thinking to apply your arrow texture onto the pipe geometry?  Or will you be compositing an arrow layer on top of your image?

If you are texturing your pipe geo, create an arrow texture and repeat it along the length of the pipe.  If you want to have the arrows animate along the length of the pipe, you can use a ramp connected to the colorGain of your arrow texture.  Animate the ramp to achieve the look of arrows progressing along the pipe. 

If you are not compositing, then you will need to use a layered texture or layered shader so that the arrows are applied on top of your normal pipe texture/color.

If you are compositing, then just make sure to use the animated arrow/ramp network to drive your alpha channel.