Hi all, I was very excited to see that Unity was getting the ability to align particles based on their initial velocity -- a feature we VFX artists at FXVille have long wanted from the many engines we work in, but have never had. The main use case this would solve for us is big, aligned, smoke/spark spears that we often spawn as part of an explosion. We currently solve this with Stretched Billboard rendering, but there's a big problem: we can never move the spears after they spawn, or they'll rotate to face the new direction! That means they can't be affected by wind or gravity, and have to die pretty quickly so as to not look silly. What we really want is a Stretched Billboard that we spawn at a rotation determined by its birth velocity, that we can have never rotate again, no matter how it moves after it's born. Unfortunately, the new alignment mode doesn't fix this problem. Regular Billboards spawn with their normal the center of the explosion (as though they were pieces of paper on the inside of a sphere), and Stretched Billboards seem unaffected. Ideally, this would also work with the mesh renderer as well (it currently seems to half-work) aligning their Z axis to the start velocity vector of the particle. Is there some feature I'm missing that would let me achieve the effect we want, or am I making a feature request? If it's a feature request, I propose that if you are in the Stretched Billboard render mode, and enable Align To Direction in the Shape module, that the Stretched Billboard particles never rotate their alignment direction after spawning, but otherwise act the same. I think this implementation would be fairly intuitive and would not stomp out any other use case or add any buttons to the UI. Thanks!