[UE4] How to correctly display Parralax on surface like walls ? [SOLVED]

NodrawNT

EDIT : Adjusting the reference plane setting fixed both the gap and the texture stretching, I had noise in the material but removing the Pixel Depth Offset node fixed it.

Hi everyone !

I'm actually struggling to get a good parallax effect on my wall inside UE4. I'm using a POM material.

For the floor it works perfectly and there is no visible artefacts even when viewed close and at an odd angle for the in-game camera.

But for the wall it looks like the material stretches the texture into the infinity.



I can't hide it with another mesh since Parallax create some kind of gap to fake the depth.

I'd love to have this depth though and Tesselation might be overkill for the depth between the planks. How would you do it ? Thanks !

Obscura

To fix the floating, adjust the reference plane. The stretching looks like you are using clamped tiling method.

NodrawNT

Well thank you very much ! I Adjusted the reference plane and now there's no gap and no more texture stretching, so I guess I can put them back to Wrap since it's fixed.

NodrawNT

And there seems to be a new problem now. I get some kind of noise I didn't get before I can't find how to fix it and gets the reference plane to work. Someone has ever see that ? 

Obscura

Are you using the pixel depth offset output?

NodrawNT

Yes I do, here's a screenshot of the material if that helps.

Obscura

I knew its the PDO because I had the same issue with it once. I didn't find a fix so I just unplugged it.

PDO also has an another issue. Lets say  you apply it on a floor that has big depth. The baked shadow wouldn't get offset, so you would see the shadow of the lowpoly mesh on the intersection.

NodrawNT

Thanks everything is looking fine now. I wonder what purposes the PDO serves then if it's working better without it.

Obscura

PDO can create nice, per pixel intersection between meshes, so youd see like a silhouette cutout. But unfortunately it has many issues yet. I assume it going to be improved in the future.