Yeah alpha blended models won’t work out of the box. The issue you mentioned was marked as a duplicate of another one, and that other one is still open.
Unreal Engine requires totally different materials for translucent versus opaque. We didn’t want to create an explosion of materials, so we only supply opaque (which is by far the most common for 3D Tiles). If you need translucency, you can create a custom material instance:
- Right-click in the Content Browser and choose Materials and Textures → Material Instance. Give it whatever name you want.
- Double-click to open the Material Instance.
- On the Details tab, change the Parent property to
M_Cesium_BaseMaterial. - Also on the Details tab, open the “Material Property Overrides” section.
- Check the box next to “Blend Mode” and choose “Translucent” in the box.
- Save and Close the material editor.
- Select your Cesium3DTileset in the Details tab find Cesium → Rendering → Material. Set it to the new material instance you just created.
I haven’t tested this extensively, but I believe it should work. Let me know how you go!
Kevin