Hi,
We just upgrade our project from Unity 3.5.6 to Unity 4.0.0f7, but found that lots of our particle systems emitting mesh have incorrect rotations. It seems the rotation axis of the mesh is its z-axis in Unity 3.5, but in Unity 4, it changed to y-axis.
The rotations of these mesh particles were set with Start Rotation property of ParticleSystem component.
We have quite lots of mesh particles, please help us to solve this problem.
Yeah, just found this out after upgrading to Unity 4 today. Took me a while to figure out what was going on. My whole particle system was rotated 90 in the x axis as I wanted the rotation to be in the world Y - think spinning coins in the subway surfer mobile game. Anyway reverting to identity rotation and re-exporting the mesh with a different rotation should do the trick for me.