how to make gltf model transparent?

hi,

I'm trying to create a gltf model with transparency. the model is a simple rectangle / plane, and the file I get from obj2gltf is transparent, but one-sided. that's why I have been using gltf-pipeline with the `--kmc.doubleSided` flag to further process the gltf file in order to make it double-sided. but after that it is not transparent anymore, although the diffuse color is still `1.0, 1.0, 1.0, 0.5`.

what's the right way to do this?

Hello,

See this example: http://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=3D%20Models%20Coloring.html&label=Showcases

Best,

Hannah

oh, I must have overlooked this example. — thank you, hannah.