About warning of import dxf

[thyis]

Hello dear developers, I imported a dxf model I designed. As you can see from the image below, view are none. dxf.zip

[HuguesDelorme]

After investigation it appears that some BSpline entities are not correct for OpenCascade. For example first BSpline entity in 88732000.dxf:

• degree is 3
• it's non-periodic(flags = 8)
• 16 control points(poles)
• 20 knots(5 unique knots)
• Multiplicities(mults) of the unique knots are: 4, 4, 4, 4, 4

OpenCascade states that each multiplicity must be <= degree(or degree+1 at the first and last knot of a non-periodic curve). For that entity, BSpline mults are incorrect. Which software did you use to generate these files?

[thyis]

Thanks a lot.
ZWsoft, A very popular design software in China in recent years

[HuguesDelorme]

As you are a commercial user of ZWsoft that would be great if you ask them about this issue. The software is creating BSPLINE entities that seem to be ill-formed(at least for OpenCascade) Come back here if you have feedback from ZWsoft dev