The bending arcs must be parts of ellipses. 3D software would do it much better with virtually zero own effort:
I tried only to draw some blurred white and black strokes over the shape. The orange lines are drawn to show, where the joints between straight and bended parts should be:Ĭoloring this for a good 3D-like shading isn't trivial. The bending curves snapped to the grid by scaling. In the next image 2 bends are constructed. In addition a couple of cross-section ellipses was drawn one horizontal snapping to the grid and a copy of it, but rotated 60 degrees: The wireframe was printed as PDF, imported to Inkscape and only the bending curves were saved. The images of the bending curves are the essential part that I reuse. The cross-sections are actually useless,because they have nodes in not so good places. The radiuses are a little bigger than in the first image. I made a reduced wireframe which has the extrusion path and some pipe cross-sections. Some tests revealed that scaling the curved part of the extrusion path was quite plausible outline. I cannot calculate how they should be drawn with the grid, but I could export the isometric vector image of the wireframe. Draw a horizontal version and make 60 and 120 degrees rotated copies.īending curves are complex. The cross-sections of the pipe are ellipses which can be drawn easily with the isometric grid. Before extrusion I made circular roundings to the corners of the extrusion path: I extruded a circle along the edges of a cube. To figure out the wanted looks I made a simple extrusion in a freeware 3D CAD program. We have got even another answer which uses Illustrator's 3D. Of course perfect result is possible in a 3D program. the visible curved outlines are the actual problem - how to produce them consistently and easily enough? Coloring the pipes to have 3D-like shading tolerates much variation because the light isn't exactly specified beforehand. I guess the projections of the bendings ie.
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