You are right, Patrice ahh... but my script have a name. My script have Colors, Noise, and a Round shape
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Coders create codes to automate what other users can do manually using GIMP resources, like the same "Gegl Recursive Transform plugin" you used. For example; there is a few bevel scripts around, maybe you have one like "Select Bevel, GT Bevel, Add bevel. "But I can do what those script can do manually". Then again, whoever wrote the scripts try to make it easier (for other users like you and me), so we don't have to make our effects manually using that many plugins or steps,. Now we have it at a touch of one button.
Anyway, thank you for your information.