Improve surfacing results - Code - Kernel

[cekuhnen]

Fusion still struggles with many surfacing shortcomings it brings over from Inventor.

Other other CAD applications do not exhibit the same surfacing issues.

For example below the loft without rails will create pinched surfaces

Users need add 3D rail curves to stabilize the loft surface

without 3d railswith 3d rails

This adds additional sketches that overlay with older sketches because Fusion cannot make a 3D sketch tangent to a surface/sketch without projecting it into the sketch

The sketch engine also still exhibits stability issues which makes this workaround also prone to fail when the design is changed.

Patch while working magic in many cases produces however rather undesirable surface qualities which makes it less optimal to use when you are looking for a smooth surface flow. Sampling edges from patch surfaces also can lead to many issues.

Improving the surfacing tools will produce the desired result instantly and eliminates all the other pitfalls.

This is an older discussion / topic and I thought to bring this up again.

2019 we have - Fusion has many cool things like generative design yet surface and sketch engine are still the weak points.

[TrippyLighting]

Some of these sketch bugs are particularly bad because they relate directly to surfacing workflows. Loft rails often connect to other projected sketch elements and have tangency or continuity constraints applied and these currently break when the geometry gets updated. In these cases the parametric workflow concept, which would otherwise be so useful to refine a shape, crumbles like like a card house and makes this practically unusable.

[Anonymous]

I agree about the geometric core. Surface is an important element. If it is impossible to correctly control the form, then it is impossible to make a correct design. The geometry is so bad that when preparing for the production of molds, topological inaccuracy creates problems.
Constantly, when creating a Boolean operation, the exactness of the initial clean patches is destroyed. Fusion approximates the geometry, changes it, deviates from the original form. In addition, there is no "untrim" command, Extrapolation very conditionally and not quite correctly extends patches, G2 does not quite correctly adjust the tension, after all this restlessness it is also impossible to control the vertices manually. As a result, the design is crooked and awkward.
It is impossible to clean up the design correctly in order to simplify the topology, so that further modeling does not slow down when building rounds, bosses and footprints. All this is very long time calculated. With subdivided surfaces (T-Splines tools) it is even worse, there patches are more crookedly connected at the quad corners.
This problem is much more than you can imagine. We still have to use Rhino (or CATIA) to do something with smooth shapes for the sake of some electronic housing or other
consumer product.
As long as Fusion does not have correct working surfaces, it will be impossible to expand the boundaries of the CAD system. Many people want to drop their CAD systems and start using Fusion for work, but problems with geometry prevent them from doing so.