Insert blocks on the curve in the direction of de normal

[dr.hybride]

hy guy

i want to insert blocks on the polyline every 10meters the lenght could be change, i did that it’s ok but when i create the block, it was created but not in the direction of the normal.
i tried with by coordinatesysteme but it did the same thing
does anyones could help me ?

[mzjensen]

Try using Curve.NormalAtParameter instead of Curve.Normal.

[mzjensen]

Or like this using BlockReference.ByCoordinateSystem.

[dr.hybride]

hy jensen it has been a long time and you are still the best

thank you very much

[mzjensen]

You’re welcome!

[dr.hybride]

hy guy

do you know why when some attribute is upside down?

and thank you very much for your help

[mzjensen]

Are you using the normal vector or a coordinate system?

[dr.hybride]

I m using coordinate système as you adviced me

[mzjensen]

Can you post a snip of what the coordinate systems look like? The Z-axis might be pointing down…

[hosneyalaa]

How to get a vector for each point at curve

I personally don’t like rebuilding geometry because it makes incorrect information sometimes. In this case, You need to sort out the normal vectors by crossing with tangent vector. See the image below. [backup_2021-08-06_08-30-44] before sorting [image] after sorting [image] if you change the number in the blue circle to -1. you could get opposite direction normal.

[dr.hybride]

you are right
the Z axis is pointing down
do you have a solution ?
best regard

[WrightEngineering]

Can you post dyn and dwg so i can look?

[mzjensen]

Try this in a code block, it should correct them:

zaxis = CoordinateSystem.ZAxis(cs);
origin = CoordinateSystem.Origin(cs);
yaxis = CoordinateSystem.YAxis(cs);

zaxis.Z < 0
? CoordinateSystem.Rotate(cs,origin,yaxis,180)
: cs;

[dr.hybride]

it works
thank you very much