Spirals Effect Plugin       What's this? This plugin is added to the menu Effects, submenu Render. You should use it to create/add spirals to your images. And so it's a simple spiral plugin. I want to add more type of curve (later?) like the Cornu's spiral (thanks OMA for the link)...   For better performances the spiral is drawn with lines from point to point to avoid ruptures. You could choice the quantity of points and play with the