topic 4-sided tangent boundary blend issues in 3D Part & Assembly Design

4-sided tangent boundary blend issues

BP_10313542 — Fri, 25 Apr 2025 13:04:46 GMT

I am using Creo 6.0 and often have issues with these 4 sided tangent boundary blends. The error says it fails to create tangency in the corner. Is there a reason for this? I understand the bounding curves have to be tangent to neighboring surfaces, and I even experimented with making the curves tangent to the whole neighboring surface and not just the neighboring surface parting line. I have tried 3 sided boundary blends but it often got tight in 1 corner and failed.

Re: 4-sided tangent boundary blend issues

tbraxton — Fri, 25 Apr 2025 13:27:26 GMT

The most likely reason for the failure is that the boundaries selected are not G1+ continuity in the areas required to make the surface tangent, without a model to query it is difficult to diagnose. If you post a model, then someone will likely be able to find the root cause of the issue.

Keep in mind that in a corner the tangent conditions (of the boundaries) are required in more than one direction in the context of what you are building.

Re: 4-sided tangent boundary blend issues

MartinHanak — Fri, 25 Apr 2025 14:35:22 GMT

Hi,

if you can't upload your model, at least display the Gaussian curvature of the adjacent surfaces... I'm just curious to see what I'll see.