Object description questions

Rhino
,
1

Why does the object description for straight lines not show degree 1, 2 points?
What is index (-1)?

Object Description.pdf (353.5 KB)

2

Hi @tfostermorphis,

Not all curves in Rhino are NURBS.

– Dale

3

That’s the render material index. If there is no material applied, it is -1.

4

Thanks.

5

Thanks…

6

What is this non-nurb curve name and purpose?

Tommy M.

7

Hi Tommy - I am not sure I understand the question but there are different ways to represent curves - some are NURBS and some not - the typical soft and swoopy curve in Rhino is a NURBS curve, but joined curves are ‘cpolycurves’ of which some segments may be NURBS, Arcs can be NURBS or not , polylines are really just an ordered series of points made into a curve, etc. ToNurbs will nurbify any of these:

image
image600×710 12.6 KB

-Pascal

8

Thanks you sir,

If creating a rectangular surface from four straight edge curves,
would single span nurbs, same degree and point count on opposite sides be preferable?

Best,
Tom M.

9

Hi Tom - for the simplest cleanest surface, yes - though, if you are working with single spans, opposite curves need not have the same degree/point count - the surface will inherit whichever is the highest degree. Same in Loft, btw.

-Pascal

10

Once more, thanks…