I'd like to achieve a smooth top and bottom surface on the body below, but using the curvature map analysis tool, I see I have hot spots around my rails and at the profile edges. Any advice on how to get a cleaner transition? Is there a better method for lofting this shape?
Work file attached. Thanks in advance for your thoughts.
You are using tangency in the Front and back profiles for the transition, you may be able to do the same at the front corner, but lofting to a point will always do that.
Restructure has helped.
Might help.....
What the curvature map indicates is a high degree of change in the curvature. So the "red spot" in the front isn't necessarily a problem in itself.
What you create when lofting is a NURBS surface. The shape of a NURBS surface is determined by a rectilinear grid of control points - also called control vertices or CVs - with associated weights. When you loft into a point the CVs of one edge of that rectilinear grid collapse into that one point and the associated weights approach infinity and the surface curvature might become questionable. CAD software has three ways to deal with this.
1. Crash!
2. Prevent the user form creating such a loft.
3. Allow the loft, but approximate.
Most CAD software uses #3.
A better way to test curvature than the curvature map is the Isocurve Analysis. You'll find that the curvature actually doesn't look bad approaching that point!
It also shows you that the real problem child is the rail 2. that can be seen in all three analysis tools, the zebra stripes, the isocurves and the curvature map. I have no idea why Fusion 360 creates these visible artifacts, and have not found a good reliable way to avoid those areas.
@jeff_strater I think that is ASM topic that could use a little attention. I know you guys push the kernel pretty hard. Please don't take the foot of the gas!
