Sunlight algorithm

def setSunlight(at, val):
    sunlightDict[at]=val

def getSunlight(at):
    if(getBlock(at) != None):
        return 0
    return sunlightDict[at]

def afterPlaceBlock(position):
    placeOneMoreLayerOfSunlight()

    def recalc(v,ignore=None):
        if(v.xmi refers to v and v.xmi != ignore) recalc(v.xmi, ignore=v)
        if(v.xpl refers to v and v.xpl != ignore) recalc(v.xpl, ignore=v)
        if(v.zmi refers to v and v.zmi != ignore) recalc(v.zmi, ignore=v)
        if(v.zpl refers to v and v.zpl != ignore) recalc(v.zpl, ignore=v)
        if(v.ymi refers to v and v.ymi != ignore) recalc(v.ymi, ignore=v)

        if(getBlock(v) != None):
            setSunlight(at=v, val=0)
        else:
            setSunlight(at=v, val=math.max(getSunlight(v.xmi)-1,getSunlight(v.xpl)-1,getSunlight(v.zmi)-1,getSunlight(v.zpl)-1,getSunlight(v.ypl)))

    recalc(position, ignore=None)