thank you very much for all your feedbacks.
I’ve been able to play with the velocity alignment now. I didn’t find the parameter easily because it is labeled Screen Alignment and the tooltip describe all the possible values as related to the camera. Well, in my mind the particle alignment on velocity was more related to the world somehow. As I said, I am new to UE.
It’s a step forward yet I couldn’t manage to get what I am looking for: I didn’t find a way to force the particle to keep a given axis up not another one to control a tilt angle according to the particle trajectory bends. Maybe this is not directly accessible? If not, I hope to see that in Niagara
What I try to get is a kind of “plane effect”, where the birds can be seen for quite a close range and we get the feeling that they really tilt to turn. Download the animated picture here as an illustration (I’ve never been able to upload the gif…).
The example in the Landscape map is great, especially regarding the birds animation, but it also works well because birds are quite far or not moving around. I would like to make my birds turn around the player and do some sort of slalom (or at least collision avoidance) not far from him.
Regarding the birds animation I’ve been advised to try the flipbook https://forums.unrealengine.com/showthread.php?47573-How-to-use-a-skeletal-mesh-as-a-particle and it provides good results. There are probably some other very efficient way to do the wings animation with the vertices position, such as an animated level on a gradient map maybe.