Any way to smoothly spawn over distance?

Unity Engine
1

I’m trying to create a smoke and fire trail behind a fast moving missile.

I’ve used the technique described here:

The problem is randomly lerping between the old and current position inevitably produces clumps and gaps just through random chance. The faster the object, the more noticeable this becomes.

Any ideas for a workaround?

2

Try spawning them evenly using spawnIndex and spawnCount, like in this post: