Hi, I created Cartographic Polygon and add Polygon Raster Overlay to the 3DTiles , but the 3DTiles only disappear when close , when stay away from it ,3DTiles reback .
Are you using a custom material? If so, it needs to include support for clipping.
not custom material, used the default material “Clipping”
Can you elaborate? I don’t know exactly what I mean by that, but I suspect whatever you did is the cause of the problem. Most likely if you Clear all of the material slots on the Tileset, it will start working.
Hi, Kwvin , I find I really used custom material , what should I do about make custom material include support for clipping 
Sorry, Kevin，I have learned how to do that , thanks 
Take a look at the default material: /CesiumForUnreal/Materials/Instances/MI_CesiumThreeOverlaysAndClipping
It is structured as material layers, and there is one layer labeled “Clipping”. Your custom material also needs to have a Clipping layer, and its name must be Clipping (or, alternatively, you can change the Material Layer Key property on the CesiumPolygonRasterOverlay).