Setting Material Vector Parameter in Blueprint not working

Development Rendering
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1

I have what I think is a simple problem, but I’m banging my head against the wall and can’t find an answer. I’m trying to get a Blueprint to set a value for a Material Parameter Collection, but it seems like no matter what I do the value doesn’t update.

For debug purposes, I set it to update every frame to a fixed color:

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But even though the Blueprint runs and hits these nodes, the values stay black:

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If I manually change the values in the Material Parameter Collection, the material updates fine. Any ideas what’s wrong here?

2

Can you show the relevant part of the material?

3

I made it super simple for debug purposes:

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When I run the scene, the colors stay black. But if I manually change them in the Material Parameter Collection, the material updates properly.

1 Like
4

Try it on begin play, instead of tick?

5

Just tried that and no dice. I also started a fresh project with just a Blueprint and Material Parameter Collection and still nothing. I feel like I’m either missing something obvious or this is a bug…

1 Like
6

Try without add.

7

Yeah I tried it without add, even created a fresh project with just the material and the parameter collection. Using the collection with the material works fine, but for some reason I can’t change the collection in a Blueprint

8

Try setting alpha color to 0.

9

Does blueprint you are executing this have tick enabled and is it in the level ?
What blueprint are you executing this from?