# Plugin by Nathan Bromham (www.guitar-list.com) # version 1.2.2 23-10-2012 # You are free to use this software for any purpose, to distribute it, to modify it, # and to distribute modified versions of it, under the terms of the Apache 2 license #----------------------------------------------------------------------------- require 'sketchup.rb' #----------------------------------------------------------------------------- # This script creates a conical tapered fretboard. # When you run this function, it will display a dialog box which prompts # for the dimensions of the fretboard, and then creates the fretboard. #draw the points on a circle sector centred on y=0, x=x and z=radius-thickness def get_curve_points(radius,width,thickness,x, resolution) pts = [] sect = 2.0*Math.asin(width / (2.0 * radius)) b = thickness - radius da = sect / resolution startangle = - resolution / 2 endangle = resolution + startangle + 1 pi2 = 1.5707963267948966192313216916398 for i in startangle...endangle do angle = pi2 + (i * da) y = 0 + radius*Math.cos(angle) z = b + radius*Math.sin(angle) if z < 0.0 z=0.0 end pts.push(Geom::Point3d.new(x,y,z)) end pts end def get_fret_side(d,nutradius,nutwidth,bodyradius,bodywidth,boardlength,boardthickness, tangdepth,res) fretradius = nutradius + ( d*(bodyradius-nutradius))/boardlength fretwidth = nutwidth + ( d*(bodywidth-nutwidth))/boardlength #top of fret groove fretpts = [] fretpts = get_curve_points(fretradius,fretwidth,boardthickness,boardlength-d,res) #underneath fret groove fretpts2 = [] fretpts2 = get_curve_points(fretradius,fretwidth,boardthickness-tangdepth,boardlength-d,res) j=0 while j <= res fretpts.push(fretpts2[res-j]) j += 1 end fretpts end def rect_face(pts0,pts1,pts2,pts3) #triangulate a rectangular face base = $boardentities.add_face pts0,pts1,pts3 base = $boardentities.add_face pts0,pts2,pts3 end def create_fretboard # First prompt for the dimensions. prompts = ["Scale Length", "Width at nut", "Radius at nut", "Width at body", "Radius at body","Board thickness at nut", "Board thickness at body", "No. of frets","Depth of fret slot", "width of fret slot","width of nut slot", "depth of nut slot" ] #default values - in inches values = [25.0, 2.38, 18.0, 3.0, 20.0, 0.23, 0.23, 22, 0.023, 0.023, 0.125, 0.125] # Now display the inputbox results = inputbox prompts, values,"Fretboard Dimensions (inches)" return if not results # This means that the user cancelled the operation scalelength, nutwidth, nutradius, bodywidth, bodyradius, boardthicknessnut,boardthicknessbody, fretcount, tangdepth, tangwidth,nutslotwidth,nutslotdepth = results model = Sketchup.active_model model.start_operation ("Create Fretboard") model.layers.add("Fretboard") model.layers.add("Inlays") model.layers.add("Fretlines") model.active_layer= model.layers["Fretboard"] $boardentities = model.entities # boardthickness = boardthicknessnut thicknesscorrectionbody = boardthicknessnut - boardthicknessbody #calculate the length of the fret board boardlength = scalelength - (scalelength / (2.0 **( (fretcount + 1) / 12.0) )) ptsbody = [] ptsnut = [] #res is the number of line components making up each curve - use an even number res = 16 ptsbody = get_curve_points(bodyradius,bodywidth,boardthickness-tangdepth,0,res) ptsnut = get_curve_points(nutradius,nutwidth,boardthickness-tangdepth,boardlength,res) #body end plane of fretboard wb = bodywidth/2.0 pts = [] pts[0] = [0,-wb, thicknesscorrectionbody] pts[1] = [0,wb, thicknesscorrectionbody] ptsbody.push(pts[0]) ptsbody.push(pts[1]) base = $boardentities.add_face ptsbody #nut end plane of fretboard pts = [] wn = nutwidth/2.0 pts[0] = [boardlength,-wn, 0] pts[1] = [boardlength,wn, 0] ptsnut.push(pts[0]) ptsnut.push(pts[1]) base = $boardentities.add_face ptsnut #flat bottomed nut slot and part of fingerboard behind the nut if (nutslotwidth>0) pts = [] pts[0] = [boardlength,-wn, 0] pts[1] = [boardlength,wn, 0] pts[2] = [boardlength,wn, boardthickness-nutslotdepth] pts[3] = [boardlength,-wn, boardthickness-nutslotdepth] base = $boardentities.add_face pts base.pushpull nutslotwidth pts = [] pts = get_curve_points(nutradius,nutwidth,boardthickness,boardlength+nutslotwidth,res) pts.push([boardlength+nutslotwidth,-wn, 0]) pts.push([boardlength+nutslotwidth,wn, 0]) base = $boardentities.add_face pts base.pushpull nutslotwidth*4 end #underneath of fretboard rect_face([0,-wb, thicknesscorrectionbody],[0,wb, thicknesscorrectionbody],[boardlength,-wn,0 ],[boardlength,wn,0 ]) #sides of fretboard rect_face(ptsbody[res],[0,-wb,thicknesscorrectionbody],ptsnut[res],[boardlength,-wn,0]) rect_face(ptsbody[0],[0,wb,thicknesscorrectionbody],ptsnut[0],[boardlength,wn,0]) model.layers.add("Fret_slots") fretptslast = [] inlaypositions = [3,5,7,9,12,15,17,19,21,24] #draw fret grooves for i in 0 ... fretcount+1 do d1 = scalelength - (scalelength / (2.0 **( i / 12.0) )) d2 = scalelength - (scalelength / (2.0 **( (i+1) / 12.0) )) if i>0 d1 = d1 + tangwidth / 2.0 end if i<(fretcount) d2 = d2 - tangwidth / 2.0 end fretpts = get_fret_side(d1,nutradius,nutwidth,bodyradius,bodywidth,boardlength,boardthickness,tangdepth,res) fretpts2 = get_fret_side(d2,nutradius,nutwidth,bodyradius,bodywidth,boardlength,boardthickness,tangdepth,res) model.active_layer= model.layers["Fret_slots"] face = $boardentities.add_face fretpts if (tangwidth>0) face = $boardentities.add_face fretpts2 #curved bottom of fret slots if (fretptslast.length>0) j = res+1 res.times { rect_face(fretpts[j],fretpts[j+1],fretptslast[j],fretptslast[j+1]) j += 1 } end end fretptslast = fretpts2 #fingerboard in between fret slots model.active_layer= model.layers["Fretboard"] j = 0 res.times { rect_face(fretpts[j],fretpts[j+1],fretpts2[j],fretpts2[j+1]) j += 1 } rect_face(fretpts.first,fretpts.last,fretpts2.first,fretpts2.last) rect_face(fretpts[res],fretpts[res+1],fretpts2[res],fretpts2[res+1]) #construction point to aid positioning of inlays model.active_layer= model.layers["Inlays"] inlaypos = boardlength - (d1+d2)/2.0 boardwidth = (nutwidth + ((boardlength-inlaypos)*(bodywidth-nutwidth))/boardlength) offsetinlaypos = boardwidth/4.0 #centrepoint point1 = Geom::Point3d.new(inlaypos,0,boardthickness+0.01) constpoint1 = $boardentities.add_cpoint point1 #lowerpoint point2 = Geom::Point3d.new(inlaypos,-offsetinlaypos,boardthickness+0.01) constpoint2 = $boardentities.add_cpoint point2 #upperpoint point3 = Geom::Point3d.new(inlaypos,offsetinlaypos,boardthickness+0.01) constpoint3 = $boardentities.add_cpoint point3 #fretline model.active_layer= model.layers["Fretlines"] fretpos = boardlength - ( scalelength - (scalelength / (2.0 **( i / 12.0) ))) fretpoint1 = Geom::Point3d.new(fretpos,-(boardwidth/2.0),boardthickness+0.01) fretpoint2 = Geom::Point3d.new(fretpos,(boardwidth/2.0),boardthickness+0.01) $boardentities.add_line(fretpoint1,fretpoint2) end # We're finished we can end the operation model.commit_operation end # First check to see if we have already loaded this file so that we only # add the item to the menu once if( not file_loaded?("fretboard.rb") ) # This will add a separator to the menu, but only once add_separator_to_menu("Draw") # To add an item to a menu, you identify the menu, and then # provide a title to display and a block to execute. UI.menu("Draw").add_item("fretboard") { create_fretboard } end #----------------------------------------------------------------------------- file_loaded("fretboard.rb")