Sometimes the solution to a problem is knowing where to look: The Patterns category of the Component Bar provides us with the versatile Tiles component that can be tweaked into a solid circle (or solid circular tiles). Simply set the Corners parameter to 100 and control the circle radius via the Mortar Width. If you want just a single circle, you can use a Kaleidoscope component.
|| Look here for more info on the parameter settings used for the Kaleidoscope component.|
You can also use a Frame component from the External component category to create circles for image framing purposes. Again, set Corners to 100 and control the circle radius via the Margin Width.
|| The Frame component does have some drawbacks when it comes to seamless tiling, so be aware of those.|
By connecting a second Tiles component to the Tiles input of the first, we can create circles with outlines. Neat! Notice how the new component has the Tiles and Mortar color swatches inverted and the Mortar Width set to a larger value.
Note that there are always many different ways to solve a problem in Filter Forge. None of them are 'wrong' per se, but some may be more efficient than others. While the above is certainly an efficient solution, one should generally aim for the one that uses the fewest and the fastest components.
Depending on your filter's goals you may have to go down a completely different route when constructing your circles. Do you need your circles neatly ordered or chaotically scattered? Maybe you should use a Cells component for some good dose of chaos! Do you need your circles to have different sizes? Then use the Map Inputs to your advantage! Ultimately, the answers to these questions will determine which techniques to use.
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