Hi milkywaif,

> Radius property is missing. Why? This is what I'm talking about.

When you do those steps, switch the "Profiles" option in the Loft to be "Profiles = Exact".

Then you should get an exact circle when you repeat those steps.


Basically when you do a Loft if you leave the default "Auto" mode for profiles, it will do an rebuild of the profiles if it sees that they have interior fully multiple knots (the juncture areas that form kinks when you drag them in Rhino).

The steps that you did results in a surface that is not quite 100% circular, it's off by something like 0.001 units.

The properties panel will only label a curve as circular (by displaying a radius value) if it's within a very tight tolerance of being a circle, more like within 0.0000001 units of circular.


It's better to make an exact cylinder by doing Extrude of just one curve, rather than doing a Loft between 2 curves. Loft has to combine multiple curves together into one single surface structure, and it tries to incorporate some simplification/rebuilding of the curves involved in order to avoid making a surface that ends up inheriting the combined structure of different curves all together.


- Michael