The best way to make roads that bend and go up or down?

pieterv

Hey Box,

I am trying the Bezierspline tool and it looks very promising. I will try to post some examples when I'm a bit more advanced.

Thanks a lot!!

Jim57

Another way that NURBS curves are better for defining the path of the road is you can pull the handles to make them more parabolic. My understanding is that if roads are built using circular arcs, they are hard to drive. You have to pull the wheel from straight to the proper radius at an instant, instead of a smooth transition over (a brief) time.

Just a design consideration, it says nothing for modeling.

Best,
Jim

pieterv

Hey Jim,

Just to be clear, by NURBS you mean tools like bezierspline?

danbig

Another thought on a workaround:

If you can get the lines you want in illustrator, why not export to DWG from there and import into sketchup for a starting point?

pieterv

Hi everyone again!

After some testing I have figured out what the best way is for me to make roads that bend an go up or down at the same time.

I mainly use two plugins:

Fredo's BezierSpline plugin: (Of which I only use the Uniform B-Spline tool because of the smooth results for this purpose.)

http://forums.sketchucation.com/viewtopic.php?f=323&t=13563

and Wikii's Follow Me and Keep plugin: (to make a road out of the curve)

http://forums.sketchucation.com/viewtopic.php?t=16465

This way I was able to make the following interchange:

I think the main drawback for the moment is that you have to devide the curves you make with BezierSpline into really a lot of sides until they get smooth. I can be wrong, but it also appears to me that the sides are not equal destributed along the curve.

@Dabbig:

Thanks, that might be usefull too one day!

Chris Fullmer

That is a nice interchange!

wyatt

Cool. How long did that take once you figured out the right plugins to use?

pieterv

That's hard to say in fact, because I didn't work continiously at it. Let's say I worked a couple of hours every day on it for about four or five days. I find it hard to make an estimation though.

Gaieus

Indeed a nice result (from here at least - don't bother yourelf with smaller flaws like segmentation - Su is just this kind of a tool).

pilou

Remarkable result!