Help with rs.pointarraytransfrom(x, rs.xformmirror())

Scripting
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1

Hello
since my script surrounding rs.Pointarraytransform(x, rs.XformMirror()) does not work the way I would like it to, it would be amazing if you can point out the mistake I made. Ive tryed for days, but could not find a solution. Thanks!

The coordinates of a tetrahedon, need to be mirrored at every cornerpoint using those of its sides, that are meeting in the cornerpoint as mirrorplane defining normals.
For context, the tetrahedon fits into a rectangle of sidelength( 1,1,1 ), and the final aim is to write a script for conways game of life, in which the existance of an instance depends on its neighbours.

By comparing the coordinates I plan to identify neighboring tetrahedon-cells.

Using rs.InsertBlock(Tetrahedon, xformmirror()), a mirrored tetrahedon is inserted flawlessly.
But the way I use rs.pointarraytransform() , it does not seem to work. Where did I make a mistake?

Thank you very much and with best regards,
Aero

This is my code:

import rhinoscriptsyntax as rs

rs.DeleteObjects(rs.AllObjects())


##Block
coordinates = [ (0,0,0), (1,0,1), (1,1,0), (0,1,1)]

#draw the tetrahedon:
lines = []
for entry in coordinates:
    aktive_Postition = coordinates.index(entry)
    for counter in range(len(coordinates)):
        if counter > aktive_Postition:   #makes every combination of ccordinates. no dublicates with counter
            line = rs.VectorCreate(entry, coordinates[counter])
            if rs.VectorLength( line ) >= 2**0.5: lines.append([entry, coordinates[counter]])  #2**0.5 = sidelength of tetrahedon
 rs.AddBlock((rs.AddLine( pair[0], pair[1] ) for pair in lines), (0,0,0), name="cell")

for p in coordinates:
    print "--> {}: ".format(coordinates.index(p)), p
    for pair in lines:
        if p in pair:
            #here starts the problem:
            print "!!!{} contains point!!!".format(pair)
            mirror = rs.XformMirror( p, rs.VectorCreate(pair[1], pair[0] ))
            mc = mirrored_coordinates = list(rs.PointArrayTransform(coordinates, mirror))
            for (a,b) in zip( coordinates, mc): print( a, "mirrored {}".format(b))
            #print "mirrored", mc
            #V1: - no problems
            #rs.InsertBlock2("cell", mirror)
            #V2: - not working properly:
            #rs.InsertBlock("cell", rs.SortPoints( mc, order=4)[0])
            
            #"""V3 drawing the tetrahedon form mirrored_coorinates:
            for point in mc:
                aktive_Postition = mc.index(point)
                for counter in range(len(mc)):
                    if counter > aktive_Postition:
                        laen = rs.VectorLength( rs.VectorCreate(point, mc[counter] ))
                        if laen >= 2**0.5: 
                            rs.AddLine( point, mc[counter])
#"""
2

I suspect the reason the V3- the lines drawing the trasnformed lines does not work -has something to do with some coordinates beeing mirrored to 2.22, as visible in the printed output. This should not happen, as the coordinates of the tetrahedon are included in those of a box size (1, 1, 1).

The lines to the point that is “wrong” are not drawn is because I limited the length of a line to 2**0.5; the sidelength of the tetrahedon.

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3

Hi @Aero,

Can you post some source code, that we can run here, that isn’t working for you?

– Dale