UDK materials are applying rotated

TheAxiom · Mar 2015

This is a weird one.
I've made some grass which looks fine in Max and the material editor, but when I apply the material to the mesh it is rotated.

With alpha
http://prntscr.com/6mp6jn

Without alpha
http://prntscr.com/6mp69e

In material editor
http://prntscr.com/6mp6fi

In Max
http://prntscr.com/6mp6vf

I'm sure there's a simple fix. Any ideas?
Thanks.

Obscura · Mar 2015

This is probably something with your mesh, and not with the material. I'm almost sure, if you would assign your mesh in the material editor as a preview mesh, it would also map it rotated. Unfortunately I can't say more, I never met with this. Try to experiment with different export settings. Also, try a reset xform before exporting.

TheAxiom · Mar 2015

Obscura wrote: »

This is probably something with your mesh, and not with the material. I'm almost sure, if you would assign your mesh in the material editor as a preview mesh, it would also map it rotated. Unfortunately I can't say more, I never met with this. Try to experiment with different export settings. Also, try a reset xform before exporting.

Yeah I tried all that. It must be a setting on the export/import but I haven't touched it since and other meshes have been fine.
I can't see anything in the settings that would effect it.

Please help someone!!

ZacD · Mar 2015

I had this issue with UDK and Softimage when trying to make grass planes, it only happened when I had duplicated and inverted meshes on top of each other. I only had a few grass planes so I just rotated the UV for the areas that were messed up.

TheAxiom · Mar 2015

I'm not sure what you mean by rotating the UE4. I'm not using UE4 anyway as it's a school project.
Nothing seems overlapped or inverted. I've tried inverting the faces and nothing changes.

I have a feeling no one is going to have a solution for me?

I can't NOT have grass in the scene.

These are my export settings
http://prntscr.com/6n1783

TheAxiom · Mar 2015

I tried a single plane and the texture is being rotated on it's side in UDK too. I tried rotating the texture but it still stays in the same direction.
http://prntscr.com/6n1bkl

I tried it with a box and it works fine, so it must be something to do with planes
http://prntscr.com/6n1chs

Obscura · Mar 2015

Probably he mean the "rotator" node in the material editor. You can rotate the texture in the shader with that.

About the export settings:
The axis conversion should be set to Y-up. At least its set to that at me and it works fine. As I know 3dsmax has the Y and the Z axis inverted. Lets see if it makes any change. But I think it does nothing with the uvs and it is rotating the geometry.

If this won't solve the problem, then fix it with the rotator node. That must work.

TheAxiom · Mar 2015

I tried the axis and rotator node, no help. At least I know now it's to do with it being a plane. Obviously I need planes for the grass so how do I get around this problem?

Obscura · Mar 2015

The rotator node must work. Show your material setup with rotator, maybe you just didn't set it up right.

Obscura · Mar 2015

TheAxiom · Mar 2015

It makes it very unhappy
http://prntscr.com/6n1krk

I imported a older version of the grass and it works fine, so why does this one not work? What the hell happened?
All I did is collapse the layers and change the axis.

ZacD · Mar 2015

TheAxiom wrote: »

I'm not sure what you mean by rotating the UE4.

Oops meant to type UV, but I guess when I started typing UV turned into UE4. You are only going to have a few variations of grass, so it would be best to best to find an work around that looks fine, and just work with it.

Obscura · Mar 2015

Very interesting.

TheAxiom · Mar 2015

My old meshes don't have centered pivots which is annoying, but I can't re-import because it breaks it.

Problem is I can't use this grass either because the planes are dark on one side. Is there anything in-engine I can do about this?
http://prntscr.com/6n1sgd

A tutorial said I had to set lighting mode to custom and move the diffuse to 'CustomLightingDiffuse' but it just makes the grass black.

Edit:

Oh wait I fixed that by putting it in 'CustomLighting' instead of the option mentioned in the tutorial.
http://prntscr.com/6n1v5c

TheAxiom · Mar 2015

Still no idea about the rotated thing though. I'd like to know how to fix it in-case it starts doing it with my other assets.

ZacD · Mar 2015

You can rotate the texture, or the UVs in 3ds max. I've only had this occur when trying to make grass planes.

TheAxiom · Mar 2015

Like I said earlier I did try that. Rotating it does nothing except make it freak out. I think it's a UDK glitch when using a plane.

Ramseus · Mar 2015

Could it be using a second UV set unintentionally? I've never seen an export/import change the orientation of UVs and your mesh seems to be the right orientation...

And one thing I've done for the ugly black shadows is to set the meshes I use with foliage layers to a lightmap size of 4 so the lightmaps are just one blur. Seems to help a bit. Obviously you don't get any detail, but it should still be either in shadow or light and it definitely speeds up light building so meh.

THendersonVFX · Mar 2015

It has to have something to do with Max, not UDK. Keep in mind, that in Maya and Max Y is up, and Z is forward/back. In UDK, Z is up and Y is forward/back. This may have something to do with your Max meshes. Set your pivot point, freeze your mesh's transformations, then delete the history.

If that doesn't work, try turning off Z Axis Up in your export settings. Whenever I export out of Maya, I leave my work facing up on the Y, with no option to change Z to up, and they import fine into UDK as static mesh FBX models. UDK may be trying to auto correct your planes for you

I use tons of planes and two sided meshes in my vfx work in UDK, and I've never had that problem.

UDK materials are applying rotated

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