Random Vector Value over time in Material?

Development Rendering
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1

Hey all. So I’m trying to figure out how to randomly adjust the wind speed of a simple grass wind node.
Essentially I’ve got the material set up and I have a constant vector of 0.5 being fed into the wind speed, but I want this value to change over time to a random value that is clamped to anywhere between 0.1 and 0.5

So I set up the following based on another answer by Zak Parish:

63863-randomvalue.jpg
63863-randomvalue.jpg1104×285 70.1 KB

This gives me the random value that I want fluxing between 0.1 and 0.5 but the problem here is that I don’t want to constantly pass this into the wind speed, otherwise it makes it look like its flickering. I want to grab a value from here about every 20 seconds and then plug that into the wind speed but I have no idea if that’s possible, especially completely inside a material.

2

So the problem is that this is for my grass mesh that’s automatically placed in the world so I have no way of referencing it in blueprint.

3

Cant you use a Collection Parameter instead and set it to a clamped random value by using a timer in the level BP?

4

You dont need to reference the mesh or the material with collection parameters. Collection parameters are global so you can call and set the value anywhere anytime.

5

Oh interesting. I’ll try this out thank you.