osg、osgEarth加载tms瓦片数据只显示一个白球，缩放过程中图层消失

[{"title":"（ 2000 个子文件 365.9MB ） osg、osgEarth加载tms瓦片数据只显示一个白球，缩放过程中图层消失","children":[{"title":"LoadEarthFile.cpp <span style='color:#111;'> 2.40KB </span>","children":null,"spread":false},{"title":"LoadEarthFile.vcxproj.filters <span style='color:#111;'> 975B </span>","children":null,"spread":false},{"title":"0.png <span style='color:#111;'> 207.82KB </span>","children":null,"spread":false},{"title":"2.png <span style='color:#111;'> 200.18KB </span>","children":null,"spread":false},{"title":"21.png <span style='color:#111;'> 200.05KB </span>","children":null,"spread":false},{"title":"9.png <span style='color:#111;'> 199.92KB </span>","children":null,"spread":false},{"title":"5.png <span style='color:#111;'> 199.69KB </span>","children":null,"spread":false},{"title":"4.png <span style='color:#111;'> 199.58KB </span>","children":null,"spread":false},{"title":"9.png <span style='color:#111;'> 199.49KB </span>","children":null,"spread":false},{"title":"10.png <span style='color:#111;'> 199.31KB </span>","children":null,"spread":false},{"title":"19.png <span style='color:#111;'> 198.32KB </span>","children":null,"spread":false},{"title":"17.png <span style='color:#111;'> 198.11KB </span>","children":null,"spread":false},{"title":"6.png <span style='color:#111;'> 197.84KB </span>","children":null,"spread":false},{"title":"16.png <span style='color:#111;'> 197.54KB </span>","children":null,"spread":false},{"title":"5.png <span style='color:#111;'> 197.39KB </span>","children":null,"spread":false},{"title":"7.png <span style='color:#111;'> 196.66KB </span>","children":null,"spread":false},{"title":"19.png <span style='color:#111;'> 196.65KB </span>","children":null,"spread":false},{"title":"22.png <span style='color:#111;'> 196.38KB </span>","children":null,"spread":false},{"title":"20.png <span style='color:#111;'> 196.21KB </span>","children":null,"spread":false},{"title":"7.png <span style='color:#111;'> 196.15KB </span>","children":null,"spread":false},{"title":"0.png <span style='color:#111;'> 196.13KB </span>","children":null,"spread":false},{"title":"7.png <span style='color:#111;'> 195.95KB </span>","children":null,"spread":false},{"title":"6.png <span style='color:#111;'> 195.84KB </span>","children":null,"spread":false},{"title":"3.png <span style='color:#111;'> 195.71KB </span>","children":null,"spread":false},{"title":"20.png <span style='color:#111;'> 195.49KB </span>","children":null,"spread":false},{"title":"8.png <span style='color:#111;'> 195.42KB </span>","children":null,"spread":false},{"title":"7.png <span style='color:#111;'> 195.17KB </span>","children":null,"spread":false},{"title":"1.png <span style='color:#111;'> 194.96KB </span>","children":null,"spread":false},{"title":"2.png <span style='color:#111;'> 194.96KB </span>","children":null,"spread":false},{"title":"4.png <span style='color:#111;'> 194.82KB </span>","children":null,"spread":false},{"title":"20.png <span style='color:#111;'> 194.63KB </span>","children":null,"spread":false},{"title":"5.png <span style='color:#111;'> 194.56KB </span>","children":null,"spread":false},{"title":"6.png <span style='color:#111;'> 194.53KB </span>","children":null,"spread":false},{"title":"4.png <span style='color:#111;'> 194.44KB </span>","children":null,"spread":false},{"title":"1.png <span style='color:#111;'> 194.38KB </span>","children":null,"spread":false},{"title":"30.png <span style='color:#111;'> 194.30KB </span>","children":null,"spread":false},{"title":"0.png <span style='color:#111;'> 194.23KB </span>","children":null,"spread":false},{"title":"23.png <span style='color:#111;'> 194.19KB </span>","children":null,"spread":false},{"title":"4.png <span style='color:#111;'> 194.18KB </span>","children":null,"spread":false},{"title":"8.png <span style='color:#111;'> 194.05KB </span>","children":null,"spread":false},{"title":"4.png <span style='color:#111;'> 194.04KB </span>","children":null,"spread":false},{"title":"2.png <span style='color:#111;'> 193.77KB </span>","children":null,"spread":false},{"title":"5.png <span style='color:#111;'> 193.63KB </span>","children":null,"spread":false},{"title":"6.png <span style='color:#111;'> 193.39KB </span>","children":null,"spread":false},{"title":"1.png <span style='color:#111;'> 192.87KB </span>","children":null,"spread":false},{"title":"3.png <span style='color:#111;'> 192.74KB </span>","children":null,"spread":false},{"title":"18.png <span style='color:#111;'> 192.58KB </span>","children":null,"spread":false},{"title":"16.png <span style='color:#111;'> 192.48KB </span>","children":null,"spread":false},{"title":"3.png <span style='color:#111;'> 191.90KB </span>","children":null,"spread":false},{"title":"2.png <span style='color:#111;'> 191.84KB </span>","children":null,"spread":false},{"title":"3.png <span style='color:#111;'> 191.69KB </span>","children":null,"spread":false},{"title":"10.png <span style='color:#111;'> 191.56KB </span>","children":null,"spread":false},{"title":"5.png <span style='color:#111;'> 191.53KB </span>","children":null,"spread":false},{"title":"3.png <span style='color:#111;'> 191.41KB </span>","children":null,"spread":false},{"title":"22.png <span style='color:#111;'> 191.11KB </span>","children":null,"spread":false},{"title":"23.png <span style='color:#111;'> 190.71KB </span>","children":null,"spread":false},{"title":"20.png <span style='color:#111;'> 190.40KB </span>","children":null,"spread":false},{"title":"20.png <span style='color:#111;'> 190.29KB </span>","children":null,"spread":false},{"title":"2.png <span style='color:#111;'> 190.29KB </span>","children":null,"spread":false},{"title":"4.png <span style='color:#111;'> 190.14KB </span>","children":null,"spread":false},{"title":"2.png <span style='color:#111;'> 190.14KB </span>","children":null,"spread":false},{"title":"4.png <span style='color:#111;'> 190.01KB </span>","children":null,"spread":false},{"title":"11.png <span style='color:#111;'> 189.88KB </span>","children":null,"spread":false},{"title":"0.png <span style='color:#111;'> 189.83KB </span>","children":null,"spread":false},{"title":"0.png <span style='color:#111;'> 189.81KB </span>","children":null,"spread":false},{"title":"18.png <span style='color:#111;'> 189.73KB </span>","children":null,"spread":false},{"title":"19.png <span style='color:#111;'> 189.71KB </span>","children":null,"spread":false},{"title":"12.png <span style='color:#111;'> 189.66KB </span>","children":null,"spread":false},{"title":"2.png <span style='color:#111;'> 189.50KB </span>","children":null,"spread":false},{"title":"1.png <span style='color:#111;'> 189.23KB </span>","children":null,"spread":false},{"title":"2.png <span style='color:#111;'> 189.08KB </span>","children":null,"spread":false},{"title":"22.png <span style='color:#111;'> 188.94KB </span>","children":null,"spread":false},{"title":"13.png <span style='color:#111;'> 188.80KB </span>","children":null,"spread":false},{"title":"22.png <span style='color:#111;'> 188.80KB </span>","children":null,"spread":false},{"title":"5.png <span style='color:#111;'> 188.60KB </span>","children":null,"spread":false},{"title":"0.png <span style='color:#111;'> 188.08KB </span>","children":null,"spread":false},{"title":"21.png <span style='color:#111;'> 188.08KB </span>","children":null,"spread":false},{"title":"0.png <span style='color:#111;'> 188.08KB </span>","children":null,"spread":false},{"title":"3.png <span style='color:#111;'> 188.06KB </span>","children":null,"spread":false},{"title":"3.png <span style='color:#111;'> 187.96KB </span>","children":null,"spread":false},{"title":"18.png <span style='color:#111;'> 187.65KB </span>","children":null,"spread":false},{"title":"10.png <span style='color:#111;'> 187.43KB </span>","children":null,"spread":false},{"title":"10.png <span style='color:#111;'> 187.36KB </span>","children":null,"spread":false},{"title":"0.png <span style='color:#111;'> 187.18KB </span>","children":null,"spread":false},{"title":"8.png <span style='color:#111;'> 186.84KB </span>","children":null,"spread":false},{"title":"3.png <span style='color:#111;'> 186.80KB </span>","children":null,"spread":false},{"title":"2.png <span style='color:#111;'> 186.76KB </span>","children":null,"spread":false},{"title":"2.png <span style='color:#111;'> 186.68KB </span>","children":null,"spread":false},{"title":"31.png <span style='color:#111;'> 186.53KB </span>","children":null,"spread":false},{"title":"1.png <span style='color:#111;'> 186.39KB </span>","children":null,"spread":false},{"title":"23.png <span style='color:#111;'> 186.37KB </span>","children":null,"spread":false},{"title":"9.png <span style='color:#111;'> 186.31KB </span>","children":null,"spread":false},{"title":"13.png <span style='color:#111;'> 186.27KB </span>","children":null,"spread":false},{"title":"9.png <span style='color:#111;'> 186.18KB </span>","children":null,"spread":false},{"title":"0.png <span style='color:#111;'> 186.05KB </span>","children":null,"spread":false},{"title":"3.png <span style='color:#111;'> 185.90KB </span>","children":null,"spread":false},{"title":"3.png <span style='color:#111;'> 185.86KB </span>","children":null,"spread":false},{"title":"22.png <span style='color:#111;'> 185.83KB </span>","children":null,"spread":false},{"title":"10.png <span style='color:#111;'> 185.54KB </span>","children":null,"spread":false},{"title":"14.png <span style='color:#111;'> 185.49KB </span>","children":null,"spread":false},{"title":"......","children":null,"spread":false},{"title":"<span style='color:steelblue;'>文件过多，未全部展示</span>","children":null,"spread":false}],"spread":true}]