[Closed] Scripting/Modelling: Intersection of 2 edges

You could try using a formula from mathworld.wolfram.com (genius site btw)

use this link
http://mathworld.wolfram.com/Line-LineIntersection.html

since your lines are on the same surface you could do it in a local space (eg. the polygon’s surface)

it takes a little brain juice but makes you all the more satisfied when done.

Maybe this is what you need maybe not…

-- E D G E	I N T E R S E C T O R
    -- Tim Waijers 2005
    --
    -- finds the intersection for two edges in an editable poly
    -- and makes a point helper on the intersection
    -- the intersection can lay outside of the edges
    --
    -- instruction:
    -- select the two edges in the editable poly and run the script
    --
    
    Edges = $.getselection #edge as array
    Master = $
    
    if Edges.count != 2 then 
    (
    	format "you have to select two edges, no more no less"
    ) else (
    	p1Num = master.getEdgeVertex edges[1] 1
    	p2Num = master.getEdgeVertex edges[1] 2 	
    	p3Num = master.getEdgeVertex edges[2] 1
    	p4Num = master.getEdgeVertex edges[2] 2
    	p1 = master.getvertex p1Num 
    	p2 = master.getvertex p2Num
    	p3 = master.getvertex p3Num
    	p4 = master.getvertex p4Num
    	x1 = p1[1]
    	y1 = p1[2]
    	x2 = p2[1]
    	y2 = p2[2]
    	x3 = p3[1]
    	y3 = p3[2]
    	x4 = p4[1]
    	y4 = p4[2]
    
    	ux  = (y4-y3)*(x2-x1)-(x4-x3)*(y2-y1)
    	ua1 = (x4-x3)*(y1-y3)-(y4-y3)*(x1-x3)	
    		
    	ua = ua1/ux
    	
    	x = (x1 + ua*(x2-x1))
    	y = (y1 + ua*(y2-y1))
    	
    	point1 = point()
    	in coordsys master point1.pos = [x,y,0] 
    )

let me know if you think it's handy

i’m terribly new at this scripting thing so go easy on me