Blending is one of those features where you gotta love using CAD.
When a complicated blend comes back successfully, it’s one of those “oh yeah” moments. We made a video demoing some of ViaCAD/Shark’s blending capability using a part that had stumped Rhino users. Click on the movie below which has several of those moments.
But… there are times when it does not work and you get frustrated. A frequent situation is that where the radius is too large for the given geometry. Another common issue is when the edges and nearby faces are nearly tangent (greater than 2 degrees less than 5). Below is a video by Nick Johnson of CADSoft Solutions Limited that demonstrates how to repair a body to blend that has the “nearly tangent” issue.