![]() ![]() The extension leaves the originals intact, they can be accessed in the layers panel. Then the same is done for the black and the inner red paths. Style is interpolated, too and there's 40 copies (=enough to fill gaps). In the right The black and the outer red paths are selected and extension Generate from Path > Interpolate is applied. The wide red path can be originally open path - maybe the start and end nodes in the same place - the duplicate is automatically open, but you must delete with the node tool and DEL the end segments after converting the stroke to path. A mess is still possible due opposite path directions, but you can fix it with Path > Reverse if needed. Closed path will cause a mess due the unpredictable starting point. Insert new nodes if there is none nearby. In this phase you must cut the paths to open at the closest possible nodes. In the GIMP gradients panel create a new gradient that is what you want to color this path with. In the gimp, open a new document that will be the pixel size you want this element of your drawing to be with some extra room. In the middle: Apply stroke to path to the wider curve, remove the fill, insert a narrow stroke and separate the edges with Path > Break Apart. Save the path to be stroked in its own svg file. In the left there's a red path and its black duplicate with much narrower stroke. In the next image it's applied to red instead of white or transparent for visibility only. ![]() ![]() In Inkscape you can try to apply Extension > Generate from path > Interpolate. This functionality is available at least in Illustrator and Affinity Designer. The curve can be an arbitary path, you only apply the brush to it. The screenshot is from Affinity Designer which allows any PNG image to be used as a brush. This is drawn with pattern brush which has a linear 3-stop gradient white-black-white. I guess blurring is a hopeless way to make trackable gradients for your robot experiments. ![]()
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