Here’s another question:
How do I find shaders for particle systems, which is key for me
Probably you could describe your question in more understandable way?
For the second question, you can create custom shaders for particles. See:
You can also use the node material editor for that:
https://doc.babylonjs.com/features/featuresDeepDive/materials/node_material/NMEParticleShaders
For your first question, do you mean you want the particle system to stay at the same location/orientation, independent from the camera? If so, you could create a second camera that would render only the particle system and that would not move/rotate.
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