Load Tiling Drone with White Edge

I add CesiumTileMapServiceRasterOverlay for CesiumWorldTerrian,
and load my local Tiling Drone from url,
But it shows with white edge.
How can I remove the white edge.
Thank you!

Most likely those white pixels are in the TMS itself, so you’ll need to go back to the source and generate it differently so that those pixels are transparent instead.

If that’s not possible, you could try defining a custom material that turns pure white pixels transparent, That’s likely to be pretty error-prone, though.

Thank you for your reply. I will follow your suggestion.