Question on Extruding a planer curve tapered

Rhino Rhino for Windows
1

I want to extrude a planer curve with a taper.

When I get to the point that I key in the draft angle percentage I’m not sure if I should be putting in a decimal point? I want a 3% taper

So would this be keyed as 3 ?
or .03
or .3

Thank You…

Kent

2

Hi, I think it is in degrees for the draft angle.—-Mark

3

yup degrees, try 90, it will lay down flat, anything lower will grow, 45 is exactly 45 degrees 1 degree is almost perpendicular.

4

Angles expressed as percent can be converted into degrees this way:

angle=arctan(percent expressed as decimal)

So, in your case the angle is the arctan of 0.03 = 1.718° (rounded)

You can calculate this directly on the Rhino command line by clicking on the angle option and using the following:

atan(0.03)r

Trigonometric functions return radians, so the r is necessary to tell Rhino that the value is in radians and to convert it automatically to degrees. You will see the degree equivalent on the command line afterwards.

https://docs.mcneel.com/rhino/6/help/en-us/index.htm#user_interface/command-line_calculator.htm?Highlight=math

2 Likes
5

is that something the mac version may not have aka missing calculator?

6

Dunno, the Rhino for Mac Help has the same topic on command line calculations as the Windows version…

7

hm that sounds like it might be a mistake then because there is no such function on mac.

8

OK, so if you make a rectangle and call ExtrudeCrv and at the distance prompt you type 10+15-5 does it extrude it 20 units or not?

9

It does extrude to 20 units. Using ExtrudeCrvTapered lets you type atan(0.03)r in the draft angle box without any problem.