Automated Lasso Selection sometimes fails

Scripting
1

Hi everyone,
I wrote a Rhino Python script which creates a Lasso selection from a List in Python.
Here is the Function:

def lassoselection (ptlst):
    for i in range(0,len(ptlst)):
        if i == 0:
            cmd = "_Lasso "
            cmd = cmd+str(ptlst[i][0])+","+str(ptlst[i][1])+","+str(ptlst[i][2])+ " "
        elif i == len(ptlst)-1:
            cmd = cmd+str(ptlst[i][0])+","+str(ptlst[i][1])+","+str(ptlst[i][2])
            cmd = (cmd + " _Enter")
        else:
            cmd = cmd+str(ptlst[i][0])+","+str(ptlst[i][1])+","+str(ptlst[i][2])+ " "
    rs.Command(cmd)

My code to run the function is:
Where the value of lmeshmoved[meshboundaryVert[0][0]][0] is -225.577453613.

ptlist = [[-165,90,0], [-120,11,0], [-165,-50,0]]
newEdge1 = copy.copy(ptlist[len(ptlist)-1])
newEdge1 [0] = lmeshmoved[meshboundaryVert[0][0]][0] -25
ptlist.append(newEdge1)
newEdge2 = copy.copy(ptlist[0])
newEdge2 [0] = lmeshmoved[meshboundaryVert[0][0]][0] -25
ptlist.append(newEdge2)

lassoselection(ptlist)

Here are example pictures:

wierd_selection
wierd_selection.jpg1152×700 293 KB

real_selection
real_selection.png903×699 262 KB

This automated Selection especially fails after leaving rhino open but not working for a while.
Is this a known bug? Has anyone any idea? It fails with a probability of about 20 %.
Thanks a lot. This is a great Forum, I have learned a lot here, now I am newly registered.
Cheers
Benjamin

2

Hi Benjamin,

i have no idea why the above script fails but would suggest to not script the _Lasso command and pass the points to the command line.

Below is a quick example to perform a lasso selection using 3d points which limits the selection to object grips. Note that this is, like the _Lasso command, view based. Make sure to turn on object grips before using it.

FindByWindowRegion.py (885 Bytes)

FindByWindowRegion.3dm (47.5 KB)

_
c.

3

Hi clement,
thanks for your answer. Your scripting skills seem to be way better than mine. I am still practising. I found the reason why my lasso selection is affected: It is the position of the mouse!!! Whenever I move the mouse into the Rhino view window the automated selection is affected. If I leave the mouse on the command window in the top part of Rhino I get a good selection. I will try the same for your script tomorrow.
Thank you very much!