Formula for a road

[IanH]

Ignoring the tools built into VW, does anyone have a formula for calculating road widths?

I know the centre line of a track, and want to draw the edge, of constant width 'w'.

Unfortunately this is no ordinary track, and it is possible that some corners are quite acute.

Image shows known centre line in blue and I want to plot the red lines and round the corners in black as VW Offset too creates lines non constant width when angles get quite acute.

Thanks

Ian

[bcd]

It's been a while but I believe you're going to need to consider the superelevations to make this work. I'll see what I can find.

What's the max. speed the road is designed for?

[IanH]

Its not actually a road, but a track and can be considered flat with no speed issues.

Basically I'm trying to draw two parallel lines of constant separation when I know the centre line - programatically without vectorworks. A road was best analogy I could come up with.

[mike m oz]

Ian the 'Double Line' Line Type in Vw 2013 does what you want.

Vectorbits' Offset Path tool works in a similar way but I suspect it uses the offset function you have already tried and therefore may not produce the acute corner result you want. http://www.vectorbits.org/VectorBits_2013/donationware/donationware.html

[IanH]

Thanks. I've now devised my own algorithm. I had made it all a bit too complicated looking for a formula when a bit of logic and school boy maths have sufficed.

Trying to do it programmatically without VW. Just used VW and road analogy as a quick example of what I was trying to achieve.

However I have now learned that VW2011 offset tool does have a round corners option.