Attempting Loft between two Facebinder objects produces Input Error

[Jacutus]

When I attempted a loft between Front Brim Left Facebinder object and Back Brim Left Facebinder object it produced the following error:

VFP Proto-Helmet Loft Input Error.jpg (229.39 KiB) Viewed 1549 times

The same error occurred when I exploded the Front Brim and Back Brim sweep objects and attempted to loft the Face objects directly.
Here is the FreeCAD file:

VFP Proto-Helmet.FCStd

(815.08 KiB) Downloaded 17 times

Is this a bug in FreeCAD or am I doing something wrong?


OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.16.6706 (Git)
Build type: Release
Branch: releases/FreeCAD-0-16
Hash: f86a4e411ff7848dea98d7242f43b7774bee8fa0
Python version: 2.7.8
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 6.8.0.oce-0.17

[NormandC]

When I attempted a loft between Front Brim Left Facebinder object and Back Brim Left Facebinder object it produced the following error:

At least you get an error. On Linux, it makes FreeCAD 0.16.6707 crash.

In the current 0.17-dev build based on OCC 7.1.0, I get the following error which gives at least some info:

BRepFill :: profiles are inconsistent

Is this a bug in FreeCAD or am I doing something wrong?

It's a limitation rather than a bug, and yes, you are doing something wrong, or at least you are making it difficult to the software.

When doing lofts, it's always best for all the profiles to have the same number of line/arc segments. That way, points on each profile are connected with a defined edge on the loft. Otherwise, the OCC geometric kernel has to interpolate, and it's not always able to do so.

Back of Brim Sketch has 10 elements, while Front of Brim Sketch has 8. Try to divide your sketch to add two more lines, ideally more or less aligned to the ones on the other sketch. Then the loft might succeed.