![]() Select a path for a higher up height group, and choose 'Paint along the path' -> 'Stroke with a paint tool'. Select a height group's path, and choose 'Path to selection' - this limits the area we're casting the shadow onto. Create and activate a new transparent layer. Repeat, until you have a path for each height group.įirst, set the parameters for the 'Airbrush' tool so it looks like a shadow, something like black at 60 - 80% opacity, with a round brush set at a little over double the size you really want. In the 'Paths' dialogue, select 'Selection to path'. Use 'Fuzzy select' (Shift + left click to add to selection) to select a group of components that you imagine should be of the same height. You might want to create a blank black or white layer to put behind your outline as an editing aid to make the lines stand out - though remember to change it to a neutral colour at the end if any of it shows through. Once done, if you have a black or white background, turn it transparent with 'Colours' -> 'Colour to alpha'. Duplicate the layer, and erase any stray lines that shouldn't be visible (useful to keep an intact backup, so you can still select the full shape of any component easily). Leave a border - you can trim it off later if you don't want to include it in the final texture. You're going to use it for selections, so make sure all the lines meet up. ![]() LibreCAD is pretty good, Inkscape would also work. Draw your outline in another program - GIMP isn't really suited to this. ![]()
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