rotate_y overrides align_y in 3D particle system

[JakSparro98]

Godot version

3.4.1.stable.mono

System information

Windows 7 Service Pack 1, gtx 970, GLES3

Issue description

I'm trying to make a cheap sparks effect, while other approaches involves the use of stretched billboard or some sort of "tail", I only need the texture to rotate based on direction (flag align_y) plus apply a billboard mode that uses local y axis to face the camera.

sadly that kind of billboard seams not implemented since Y-Billboard is constrained to global y axis, I said "ok, let's randomize all angles" to reduce the sharp edge effect when looking from the flat side of the quad mesh, but it seems that applying rotate_y flag nullify the rotation of the before align_y

Steps to reproduce

• Create a particle node
• assign a quad mesh with material and texture
• create a particle material and check both align_y and rotate_y

Minimal reproduction project

No response

[QbieShay]

Pushing to 4.1 with annex proposal godotengine/godot-proposals#5591
This is a very important feature to have but it's not critical enough to halt release and can be worked around with a custom billboarding code

[QbieShay]

Note this should probably be implemented so that the rotate_Y of the particle affects the particle's LOCAL y axis instead of global.

[KnightNine]

Not being able to enable Rotate Y is annoying even for 3D particles since they are all rotated the same way on their local Y axes making them look flat/ not naturally random:

Any progress on fixing this?

[QbieShay]

I'm currently busy IRL so not that I know of. It will come into a batch of transform align option in the future.