[Open Beta] Procedural On-the-Fly Animation in UE4: iTween!

[JaredTherriault]

@;255112

Cool that fixed it. I remove all the STweenableWidget class references from iTInterface.h, iTInterface.cpp, iTweenEvent.h and iTweenEvent.cpp and rebuild it.

Thanks for the help.

Glad to! I’ll have to look into new ways to incorporate slate tweens for Mac’s sake. Odd that it works on iOS but not Mac.

@Fitzrurisk;256590

Hi there !

I am (again) ! Everything works perfectly now, I can build the whole project, so thanks very much indeed !

I have a small issue with one of my fishes : It’s been created using Maya and the bones are OK but it’s not facing correctly : when using Orientation = Path in Itween, it does work, but the fish moves toward its side, like it’s surfing (or is drunk, which is pretty cool but definitely not correct !). I usually correct that with reimporting the mesh and skelleton and use the “rotation option” when importing. But on that particular fish, the skelleton root seems to be offset with the mesh root and rotating at import completely messes the animation (the fish now looks like it’s been run over by a car, which is quite less cool than previously, but still quite fun).

My question is : is it possible to rotate that actor by 90° and then to use the MoveActorToSplinePoint with Orientation = Path to make sure the fish faces the spline (with its nose, not its bum)? I’ve seen the “constrain rotation” node in the iTween lib, can that help me? Do you have something in mind?

Thanks a lot again

Take care,

F

Hey Fitz, orientation = path will always have the object’s forward vector look down the path. In UE4, the forward vector is X. Most 3D packages use Y or Z for forward. As such, you have to make for fish’s face look down the forward X Vector. You can do this in a number of different ways.

-Rotate your fish in Maya so that its entire system faces down X+
-Rotate your fish’s skeletal mesh component in its blueprint to have it face down X+
-On Tween Update, set actor rotation on the fish to be itself + a yaw offset. This will be called after the tween’s logic every frame so it should look just fine.
-Have a second object that follows the spline a little earlier than the fish and orient to target rather than path (this idea is stupid don’t do it)
-Wait for the next major version of iTween which will have options for position and rotation offsets

1 or 2 should do it, but 3 is a good backup plan. I don’t even know why I typed 4. I guess for completeness. 5 will work great if I do say so myself, but it could be a while. Bugfixes take priority with iTween, and there’s a lot going on in my personal life and professional life right now