Triangular hole array

[neilyj666]

I need to create a triangular grid of injection boreholes with side lengths of 2m and can't think of a slick way to do it.

I've created two linear arrays of polyline at the correct spacings and MAPCLEANed to break all the crossing lines so I now have line segments at the correct locations.I now need to put a point at each vertex to show the locations of the holes.

I'm sure there must be a better way of doing this - just thinking while typing: if the two array are on different layers, I could JOIN the polys on each layer and then add POINTS at vertices??

Thanks

[dasindog]

I would either use the "create points on verticies" or by "divide" method. Once you figure out the lengths of polyline you need you would just join them up in some manner and run the commands. I think you are on the right track.

[neilyj666]

I did try using MEASURE but it got a bit tedious....but I think it's going to have to be tedious....

[sboon · Accepted solution]

I'm assuming that the grid is made up of equilateral triangles with 2m sides.  I would create the first row manually, then copy them down and over to build the second row.  From there you can either copy two rows down at a time, or use the ARRAY command to finish off the grid.  Do you want the point numbers in a sequence so that they can be laid out boustrophedonically or do you want a repeated left to right pattern?

Steve
Please use the Accept as Solution or Kudo buttons when appropriate

[neilyj666]

the screenshot is exactly what I'm trying to achieve although the actual boundary is a bit ragged. how could the point numbers be done boustrophodenically (I had to Google that one..!!)

[troma]

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@sboon wrote:

...

 Do you want the point numbers in a sequence so that they can be laid out boustrophedonically or do you want a repeated left to right pattern?

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 Nice!  Way to improve my vocabulary, Steve.

[sboon]

Using the phrase boustrophedonic layout is a good way to impress the hell out of an old-time surveyor. 

Neil - if you create the starting sequence of points correctly then the sequential pattern will be repeated when you copy them.

Steve
Please use the Accept as Solution or Kudo buttons when appropriate

[BrianHailey]

Just another thought;

Hatch pattern.

Adjust origin to get the pattern the way you need it.

Explode.

Drawing cleanup - break crossing.

Create Points - Automatic.

[NMRollo]

Thanks for the word. As an old time surveyor, I am impressed.

As a matter of interest, how would you number the points "boustrophedonically"

[sboon]

Create the first row of points left to right, and the second row right to left.  When you copy them they will maintain that order, with new point numbers.

Steve
Please use the Accept as Solution or Kudo buttons when appropriate

[tcorey]

Neil, it looks like it would be simple to create a LISP routine that would make AutoCAD Points, then you could convert those to Civil 3D points.

Post a drawing and I could probably write something for you in a few minutes.

[neilyj666]

thank for all tbe replies I'll try them and post a drawing on Monday 🙂

[neilyj666]

Drawing attached

[tcorey]

Is it always twenty/twenty-one columns by ten rows? Odd numbered rows have 20 points and even numbered rows have 21 or do you need those values to be variable?

[neilyj666]

Ideally variable as the areas for holes vary in size and shape but it is easy enought to just "lasso" the points required and make a group for instance

[tcorey · Accepted solution]

Is this what you're talking about?

File is .lsp but I had to rename it to post. You'll need to rename it back.

Tim

[neilyj666]

thanks will look at when back in work tomorrow

[neilyj666]

Perfect - many thanks for this

[neilyj666]

The lisp works great in 2013 but seems to behave differently in 2014 - I'm not complaing just curious as to why...

In 2013, I had a boundary and the routine created the stated number of rows and columns per the input parameters but in 2014 the routine stopped either side of the boundary but the distance from the last point to the boundary was greater than the stated 2m spacing so I'm wondering why (as I'm lisp illiterate)

[tcorey]

Weird. I wrote and tested in 2014.

Be sure you turn off any osnaps before you run it and see if you get different results. Sorry, I usually am good about  safety features but I was in a hurry to get this out between support calls...

Tim