I am trying to create a logarithmic spiral defining it with an equation, but I can't get it to work!
I found a formula on another forum (for ProE) and copy/pasted it into the equation window.
theta = t * 360 * 2.2
a = 0.005
r = exp (a * theta)
The result is "Feature failed to regenerate". Creating ordinary spirals gives no problems, but adding ln, x^ or exp functions gives me problems. I think I miss some basic programming skills here.
Any suggestions how I get going?
Going for the easy solution: Are you using a cylidrical coordinate system? If not then theta and r won't affect anything.
The equations are parametric equations (mathematical definition), relating each of the variables r, theta, and z to the parameter t.
Vary t from 0 to 2 in the dashboard, change to a cylindrical coordinate system, choose your csys, and then enter the following equation:
Change z to z=exp(5*t) to get a exponential helix. Be careful with exponentials. A little bit can go too far very quickly and it will fail.
Good observation on the range of values.
The original radius is from 1 (exp(0)) to about 52.5 (exp(0.005*1*360*2.2))
Ever watch Doodling in Math Class with Vihart?