I cannot see how your diagram has enough constraints to determine a perpendicular line. However, if the lines are all in the same xz plane then you can generate a perpendicular line to L1 and the y axis by taking the cross product of these two vectors.
well cross product does make a 90 degress perpendi… but in Z
i was tinking more of the mathutil intersect option i guess
cause it has to stay in 2D - for this model
mind you i’d like to have the equivalent for 3D too - might be usefll in futur
any simple example using the intersect of mathutil woild be a good start
i can give more details on the sequence of calculations for the model in mind
if that can help
like if you have a line in space and with python you want to find the middle of this line
is there any simple way of doing this - may be one of the calss in mathutil?
Cross-product will make it perpendicular where ever you want, just choose the correct vector to use as the cross product. For instance if you want the result in the xz plane choose (0,1,0) as the other vector.
To determine the middle of a line defined by two endpoints that is two vertices, add them together and divide by 2.
(Vector((1,2,0))+Vector((0,1,2)))/2.0
NB you cannot add lists this way, only the Vectors in mathutils
I am not sure of your expertise here, but an introductory course on elementary vector algebra, such as the first couple of lectures here, may be useful:
i thnk i know some things about vectors - but a little rusted over time
it’s more to learn more about what is available in python and blender
like this intercept can do intercept considering the lines has beingh infinite
whhhc is nice and now i fond the way to make it work and it’s fine!
but i still wold like to see a good tut on what else is available with some good example
shoiwng how to write things - i did not find any good tut up to now
so i guess the forum is the right place to ask questions about it
anyway for the model i found an alternative way for some of the calculations in 2D
and it’s working with lot’s off cos sin and tan ect…
it would be nice to see other pre define functions in python for theses type of calcualtions