When particles have a VelocityPerpendicular orientation, Front emission direction, and the parent part/attachment is rotated where the LookVector is parallel with the global Y-axis, particles do not render at all.
This doesn’t happen with any other emission direction, even when that emission direction’s related axis is aligned with the global Y-axis.
Reproduction file:
Reproduction.rbxl (97.1 KB)
Particles will start rendering once the LookVector is not perfectly aligned with the global Y-axis.
Expected behavior
I expect particles to render in all emission directions, maintaining consistent and predictable behavior.