[PCG] Transform rotation only on the Z axis

[DaftAlexPunk]

Hi,

I am spawning actors (bp with mesh + light) along a Landscape spline using PCG.
So far so good, but i need to orient them to have them with a 0 Rotation along Z axis, but to keep the rotation on X and Y (because the meshes needs to be ortogonal to the landscape spline).

I’ve tried to use copy attributes to copy $Rotation.X and $Rotation.Y to temp variable and then, then RotZ to using absolute, then pasting back temp var to $Rotation.X and $Rotation.Y but this makes Unreal Engine instable and it crashes often when moving rescaling / translating the PCG volume.

In the screenshot above, connecting the last copy attribute node on the bottom right to the actor spawner makes unreal (5.3.1) crashes:

Assertion failed: IsRotationNormalized() [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Math\TransformVectorized.h] [Line: 1300]

There must be an easiest way or a way that works

[Evilnescu]

Hi there! I have exactly the same problem. Any luck with this?

[DaftAlexPunk]

No, and I haven’t looked further to it, I was expecting an answer from the PCG community

[Evilnescu]

Yeah, so I’m in 5.3 and having the exact same problem, like i said. Unreal crashes instantly when i hit debug on anything following the Rotation tampering. I used Noise, with Set to 0, but alas, crashes.
I think there might be a way to do this using rotators in PCG, but i don’t know how to and resources are, of course, scarce on how to do that

[FireGM]

You can’t just change the rotation because it’s stored in a transform. You need to create PCGBlueprintElement and change it inside.

This is what I used to generate stairs

[DaftAlexPunk]

Thanks for your answer !

I tried your approach by:
Create a PCGBlueprintElement, and on that PCGBE I’ve overriden the point loop body

Then on my PCG blueprint, i’m calling that Blueprint :

but when I debug and inspect,
i can see points in
i do see nothing comes out

And even when I shortcut the PointLoop Body like below, I don’t get any point out:

[iHad169]

Me Too
But I finded we need create “Execute with Context” function

This is my copy code successed

PCG override ExecuteWithContext boilerplate posted by fastchaos | blueprintUE...

You can try try it

AbsoluteRotationZ.uasset

[AsdPtion]

omg, there is a more easy solution. In projection node just remove checkbox from project rotation. Thats all.