. > No replica at fc-f.

offset(a,d)=(((rawradius*x_tra/2)-d*5) -scle(d)* rawradius*x_tra ); function x(a,d) =( scle(d)* rawradius*x_tra * abs(sin(a/2))+offset(a,d) ); function y(a,d) =(scle(d)*rawradius*0.6 * sin(a)); //*(sin(a))*1.4 pa=[for(lev=[0:levs+1]) for (a = [0:step:360+step]) [ a == (360+step) ?

Of course I will remove surfaces based on surface normal or use a utility from cfMesh that produces the surface I need from an X-Y planar sketch ... This is maybe why both ideas got mixed in my head! -- Sent from: http://forum.openscad.org/

The offx, offy are to be calculated using cos and sin, which shouldn't be hard.

//Obtain vector of points on circumference of circle of radius = 50, start angle=10, end angle=45, step of 2 degrees circum_pts1 = circum_pts([[]], 10, 50, 2, 45); echo(circum_pts1); function circum_pts(pts, angle, rad, angle_step = 1, end_angle=360) = let(x =rad * cos(angle)) let(y =rad * sin(angle)) angle < (end_angle+1) ?

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Using >> "max(triangle)" [1,0] is returned (so I can extract the max "x" value), is >> there a way to get the max "y" value or should I just index through each >> "y" and store the max value?

atan2 also does something else, it returns the angle in the correct quadrant for the signs of x and y. I don't know offhand if this is your problem, but it can only help.