And if pigs could fly, they were doves. - 3D hardware does not support roll angles for points. The only supported parameter is the size. For anything else there's apparently no demand.

well never the less , someone has done this. i have it on my hard drive. couldnt find the auther of it in the folder, but it rotates sprite particles. its an a7 project. maybe the auther of it will come forward.

Seems you still didnt get it, do you?

Badapple, Gamestudio has rotated sprite particles since years. This discussion was about point particles.

petra , my post was intended to be helpfull. if you dont like it
thats just to bad for you.

@Felix,
I sincerely apologize, my miscommunication. I am always very greatful for your expert help, I meant no disrespect to you.

After much experimentation, you can indeed stretch particles by moving their velocity vector away from their position vector with the STREAK flag set and the MOVE flag not set.

However, the stretched particles end (moved by vel_xyz) cannot move off the edge of the cameras view until/unless the position end of the particle catches up. It looks as if the particles leading edge hits the edge of the veiw and stops. Once there, you can stretch compress the stretched particle just by panning the camera!

So sadly, GS still cannot stretch particles to emulate effects like Unity3D's particle renderers "Velocity Scale".