4 24">', dodeca: '', tri: '', pdown: '', poff: '', poffdown: '' }; var SHAPE_ORDER = []; ['cube','pyramid','tri','pdown','poff','poffdown','sphere','cyl','torus','cone','octa','tetra','icosa','dodeca'].forEach(function(s){ SHAPE_ORDER.push(s, s+'~ghost'); }); var SHAPE_LABELS = {cube:'Cube',pyramid:'Pyramid',sphere:'Sphere',cyl:'Cylinder',torus:'Torus',cone:'Cone',octa:'Octahedron',tetra:'Tetrahedron',icosa:'Icosahedron',dodeca:'Dodecahedron',tri:'Triangle',pdown:'Upside Down Pyramid',poff:'Offset Pyramid',poffdown:'Offset Upside Down Pyramid'}; var SHAPE_CODES = {cube:'c',pyramid:'p',sphere:'s',cyl:'l',torus:'t',cone:'v',octa:'o',tetra:'r',icosa:'i',dodeca:'d',tri:'g',pdown:'u',poff:'f',poffdown:'w'}; /* equal and opposite: every shape has its intaglio-ghost twin */ function shapeBase(key){ return String(key||'cube').split('~')[0]; } function shapeIsGhost(key){ return String(key||'').indexOf('~ghost') >= 0; } function ghostIcon(svg){ return String(svg).replace(/#ffd700/g,'#caa64b').replace(/stroke-width=/g,'stroke-dasharray="3 2" stroke-width='); } function shapeLabel(key){ var b = shapeBase(key), l = SHAPE_LABELS[b]||b; return shapeIsGhost(key) ? l+' ghost' : l; } var curShapeKey = 'cube'; function shapeGeo(shape, side){ /* every shape is built at 1-ruby size, then settled so its base rests at -side/2 */ var g; if(shape==='pyramid'){ g = new T.ConeGeometry(side*0.7071, side, 4); g.rotateY(Math.PI/4); } else if(shape==='sphere') g = new T.SphereGeometry(side/2, 20, 14); else if(shape==='cyl') g = new T.CylinderGeometry(side/2, side/2, side, 20); else if(shape==='torus'){ g = new T.TorusGeometry(side*0.32, side*0.18, 12, 28); g.rotateX(Math.PI/2); } else if(shape==='cone') g = new T.ConeGeometry(side/2, side, 24); else if(shape==='octa') g = new T.OctahedronGeometry(side/2); else if(shape==='tetra') g = new T.TetrahedronGeometry(side/2); else if(shape==='icosa') g = new T.IcosahedronGeometry(side/2); else if(shape==='dodeca') g = new T.DodecahedronGeometry(side/2); else if(shape==='tri'){ var tsh = new T.Shape(); tsh.moveTo(-side/2,-side/2); tsh.lineTo(side/2,-side/2); tsh.lineTo(-side/2,side/2); tsh.closePath(); g = new T.ExtrudeGeometry(tsh, {depth:side, bevelEnabled:false}); g.translate(0,0,-side/2); } else if(shape==='pdown'){ g = new T.ConeGeometry(side*0.7071, side, 4); g.rotateY(Math.PI/4); g.rotateZ(Math.PI); } else if(shape==='poff'){ g = new T.ConeGeometry(side*0.7071, side, 4); g.rotateY(Math.PI/4); shearGeo(g, side*0.5); } else if(shape==='poffdown'){ g = new T.ConeGeometry(side*0.7071, side, 4); g.rotateY(Math.PI/4); shearGeo(g, side*0.5); g.rotateZ(Math.PI); } else g = new T.BoxGeometry(side, side, side); g.computeBoundingBox(); g.translate(0, -g.boundingBox.min.y - side/2, 0); return g; } /* the offset, found: shear proportional to height — the lean flows, fluid, no kinks. the base stays flat (t=0 unshifted) so the stone still stacks properly. */ function shearGeo(g, amt){ var pos = g.attributes.position, i, y, ymin=1e9, ymax=-1e9; for(i=0;iymax)ymax=y; } var span = (ymax-ymin)||1; for(i=0;i