提出来，或参见：http :
//jsfiddle.net/wivlaro/mkaWf/6/
function visitAll(gx0, gy0, gz0, gx1, gy1, gz1, visitor) { var gx0idx = Math.floor(gx0); var gy0idx = Math.floor(gy0); var gz0idx = Math.floor(gz0); var gx1idx = Math.floor(gx1); var gy1idx = Math.floor(gy1); var gz1idx = Math.floor(gz1); var sx = gx1idx > gx0idx ? 1 : gx1idx < gx0idx ? -1 : 0; var sy = gy1idx > gy0idx ? 1 : gy1idx < gy0idx ? -1 : 0; var sz = gz1idx > gz0idx ? 1 : gz1idx < gz0idx ? -1 : 0; var gx = gx0idx; var gy = gy0idx; var gz = gz0idx; //Planes for each axis that we will next cross var gxp = gx0idx + (gx1idx > gx0idx ? 1 : 0); var gyp = gy0idx + (gy1idx > gy0idx ? 1 : 0); var gzp = gz0idx + (gz1idx > gz0idx ? 1 : 0); //only used for multiplying up the error margins var vx = gx1 === gx0 ? 1 : gx1 - gx0; var vy = gy1 === gy0 ? 1 : gy1 - gy0; var vz = gz1 === gz0 ? 1 : gz1 - gz0; //Error is normalized to vx * vy * vz so we only have to multiply up var vxvy = vx * vy; var vxvz = vx * vz; var vyvz = vy * vz; //Error from the next plane accumulators, scaled up by vx*vy*vz // gx0 + vx * rx === gxp // vx * rx === gxp - gx0 // rx === (gxp - gx0) / vx var errx = (gxp - gx0) * vyvz; var erry = (gyp - gy0) * vxvz; var errz = (gzp - gz0) * vxvy; var derrx = sx * vyvz; var derry = sy * vxvz; var derrz = sz * vxvy; do { visitor(gx, gy, gz); if (gx === gx1idx && gy === gy1idx && gz === gz1idx) break; //Which plane do we cross first? var xr = Math.abs(errx); var yr = Math.abs(erry); var zr = Math.abs(errz); if (sx !== 0 && (sy === 0 || xr < yr) && (sz === 0 || xr < zr)) { gx += sx; errx += derrx; } else if (sy !== 0 && (sz === 0 || yr < zr)) { gy += sy; erry += derry; } else if (sz !== 0) { gz += sz; errz += derrz; } } while (true);}
