Particle system - not all particles have a texture sprite

Question

I created a particle system, set duration to 1 second and particle count to 15. I also created a material, added a sprite to it and then set that material in particle system Renderer options. However, when running the particle system in scene editor, 15 particles are emitted but only 5 or 6 have the sprite material shown, the other particles are just empty, without any material. Sometimes 10 out of 15 particles have a visible sprite material, sometimes even less and it always varies.

Could the problem be in some rendering option or with particle lifetime?

What could be wrong? I don't do anything in code other than calling .Play()

psEffect.Play();

This is what the problem looks like:

You can see that lots of emitted particles dont have the star sprite.

Settings:

Duration: 1.00 Start Delay: 0 Start lifetime: 1 Start speed: 10 Start size: constant between 1 and 3 Start rotation: constant between 0 and 270

Emission Rate over time: 25

Shape Shape: Sphere Radius: 1, thickness: 1 Arc: 1 Texture: 2D sprite that you can see on image above Scale: X 7, Y 1, Z 1

Renderer: Render mode: billboard Material: I created a new material Min particle size: 0 Max particle size: 0.5 Order in layer: 10

Answer 1

It's caused by the Texture field in the Shape section.

It's in that section for some reason. Actually, it controls the shape of the particle cloud by altering particles' colors including alpha, not the individual particle's texture.

Particle system without that setting:

...and with:

The texture used:

It's unclear for me how their colors are determined when Shape is Sphere but if we look at this angle (system is not rotated, and red arrow points away from us), we can see a coincidence:

The same if Shape is a flat Circle:

You stated that you have already created a material for particles' rendering, and I see that it works properly. I have done that too:

The result (of course with shape texture disabled):

No invisible particles.