I asked this question some time ago and it was looked ilke i solve trouble, but i decided to ask this again.
So, i think that it would be usefull to render sprites right on the screen.

For example, i want to move my sprite with camera, and particles may not to be effected.

Look here: i created entity in 3d and place it in front of camera. Entity creates particles. When camera is not rotate, everything looking ok

but as i rotate camera to the right direction(clockwise, by pan axis), i get


I think that render particles right on the screen would be able to solve this

You mean particles in view coordinates, rather than world coordinates. This would be possible, but it's rarely needed, so I'm not sure if it's worth an new particle flag.

You can solve this problem already in world coordinates, in the particle function:

- get the distance vector from the camera to the particle
- rotate this vector by the same euler angle you added to the camera angle.
- get the distance vector from the rotated vector to the original vector
- add this new distance vector to the particle position.

This should keep your particles in front of the camera regardless of the rotation.

I tried that method some time ago, but i didnt got this wark.. in addition, i thought that it would be usefull for users

Okay, i have next trouble... As emitter is far from camera, it can be postioned behind the models... so, sometimes i dont see particles at all

In addition, it's looking like non-optimized to translate particle coordinates from 3d(emitter) to screen, then calculate new position in 3d, and then translate into screen coordinatees again...

I'd be REALLY happy, if you (please-please-please) add posibility of rendering particles right on the screen, like entittes:
ENTITY* shotgun_onscreen =
{
type = "shotgun.mdl";
layer = 2; // display above view entities with layer 1
flags2 = SHOW; // lite-C only:
x = 100; // place 100 quants ahead of the view
y = -50; // 50 to the right
z = 0; // and center vertically
}

if anyone else would need it, look there
http://www.opserver.de/ubb7/ubbthreads.php?ubb=showflat&Number=261827#Post261827

PS: still, i dont think that its the fastest solution

I have perhaps a solution for you ?

Why not creating a 3D plane with a transparent texture that would be placed in front of your camera and would not move.
And each frame :
-Clear the texture or reaload the transparent one.
-draw on the sprites(textures) you want on the plane

drawing on the texture... hm.. idea isnt bad, but i think that if i'd have a lot of particles, it may be too slow