Try at http://www.coniserver.net/coni_users/web_users/pirvu/au/scripts/swordtrail.zip

noob question. i know how to use it with my weapon alone like the example, but how can i use it if i have a model and the model is a weapon? do the character using the weapon have to have a trail too, or can i just have the weapon use the code. i am not sure how to implement this for my use. can anyone help?

@sheefo: thank you very much! i'll surely use it

This is a really good contribution! Thank you!

I've got a very weird problem, vec_to_mesh in my current project doesn't work On any model, it works but it deforms it so strangely and not to the coordinates I specify...Does any have any idea?

same here david, the trail works nice, but it's not attached to the entity, it's halfway across the map.....

I figured out the problem. Instead of
trail1=ent_create("trail1mdl.mdl",my.pos,null);
use
trail1=ent_create("trail1mdl.mdl",nullvector,null);

Thank you so much Mocosgames! I was running my brain crazy trying to figure it out. Is it a realtive/absolute coordinate issue? How'd you figure it out? Thanks again!

I don't know if you can help me here, the moment the weapon the streak is attached to, when it passes x coordinate 3700 (approx) the streak disappears, if I go back it appears again...Would you happen to have any insight into this? Thanks

Edit: I tried this:

vec_set(trail1.x,my.x);
vec_for_vertex(trailpos2.x,my,1); // vertex # for top of blade
vec_for_vertex(trailpos1.x,my,2); // vertex # for bottom of blade
vec_sub(trailpos2.x,my.x);
vec_sub(trailpos1.x,my.x);

And it kind works, stops the model disappearing, but then the interpolation code you implemented doesn't quite work the same, doesn't look as good...