How can i change the sprite of a particle object ingame?
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As you can see in the manual article for the Particles plugin this is not something you can do.
Apart from having several particles plugins, each with their own textures, it is not possible with a single one, further than the modification of the plugin's parameters.
The particle object doesn't support frames, animations and or load image from url..
Unless I'm missing something, I guess your best option would be replacing one particle-object with another particle-object which has the different sprite..