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CAD tip CAD tip # 13163:

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Blended transitional solid between irregular regions, circle-rectangle transition (3D in AutoCAD)

A - answer See the video-tip - use the LOFT command to create a 3D solid between two irregular shapes, incl. e.g. a transition between a circular and rectangular profile (e.g. circle-rectangle transition for ventilation ducts).

You can use 2 or more 2D profiles of any shape to create a 3D surface or closed (watertight) solid. The command creates a transition shape between the specified profiles. A profile can be virtually anything - a 2D polyline, 2D solid, 2D spline, arc, circle, an edge or face of a 3D solid, ellipse, spiral, line, surface, region, trace or even a point (only the first or last profile). You can also specify the normal (method of lofting) on each profile. If the LOFTNORMALS variable is set to 1 (smooth fit), you can use the arrow nodes on each profile to specify the continuity (G0, G1, G2) and bulge of the shape transition for that profile. The special mode "Draft angle" (see the main options node) allows you to specify the draft angle of the transition shape on the specified profile:

You can then create a shell (e.g. a pool body) from the resulting solid. Just specify (by picking with Ctrl) the area that will be removed from the original solid - before the shell walls are thickened - i.e. where the solid will be "opened". If you want to open the shell in more than one place, select more faces. Then you just need to specify the shell thickness.

100% *  CAD 
11.12.2021    19792×  
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applies to: AutoCAD ·

See also:
Tip 12717:How to hollow out a 3D solid body in AutoCAD?
Tip 10740:How to convert a pyramid made of 3D faces to a 3D solid?
Tip 10219:Can Autodesk Fusion 360 make use of multicore CPUs?
Tip 7632:Modeling error: No solution for a vertex

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