thank you for your help. i fixed the .dae files,and then i have solved the problem that the files of .b3dm can not see.
i have another problem now, I use near 2GB data to do the test, Chrome browser browsing speed is not very fast, memory consumption is about 300MB, and fireFox memory consumption is about 1GB. the total data is over 400GB, the area is over 40 km2, How can we optimize browsing speed and reduce memory? Is it better to set the geometricError parameter? do you have a method or tool to calculate the geometricError?
thank you very much!