Decal blending along spline, help.

[Ken]

Okay, so I hope someone can help me out with this. Essentially I’m trying to create an oil-stained effect you see on Highways/Interstates, with a blueprint that duplicates a gradient decal along a spline.

I followed a tutorial on how to do it. He only used footprints so he didn’t have to have them blend like I do. So I’m KIND of there but I’m running into a few issues.

Issue #1) I made a simple gradient to be used in the opacity in the Decal Material. Only the gradient is showing up very segmented. I’m guessing this is due to the compression settings. I’ve looked through them and I’m not really able to track down what might be the fix here.

Issue #2) The decal is replicating along the curve but the images aren’t blending together and aren’t showing up on the surface in the best way.

See the attached image. You can kind of see both issues at play here. I’m pretty certain it’s something I’m missing in the settings. Just trying to get a blended multiply effect going

And here is the blueprint I built off his video.

[Ken]

OKAY, got a solution to my issues!

Found a post in another topic by user @Ndy200 . Shout out to you sir! thank you!

I simply had to turn off the “Dbuffer decal” in my project settings and everything worked exactly as expected. Not sure if this will effect anything else by disabling it. So I’ll need to look more into that setting and what it’s for.

Instant Projected Weather

Attention! If you want to use the new Unreal Engine 5 version, turn off the dbuffer decal in the project settings. It seems that the decal settings have not yet been completely finalized by Epic engineers, but dbuffer “true” is the default value when opening a project.

To fix the overlapping issues I just made an “Offset” variable the user could adjust in the BP and you just set it to the size of bit map’s length that it’s tiling in.

Here is my updated result. To note I’ve brightened up road material. Please excuse the obvious tiling.