Image sweep across screen then return

[microbe]

I am able to get an image to sweep across the screen and then back using a combination of sine wave/scale/offset in the Y plane, but what I really want is for it to sweep across the screen once and then reset and repeat without sweeping back. It is as though I need a saw oscillator.

I am sure when someone says "try this" it will be obvious, but I can't seem to crack it.

Thanks in advance.

[Terry Payman]

The Ramp modifier in a Translate module is exactly what you need to get your saw oscillator.

From the User's Guide:
"Generates a value that increases linearly until reaching 1, then starts again at 0. A higher modifier parameter results in a faster rate of increase. The input value is added to the parameter, and instantaneously increases the rate.“