3D model turn black after conversion into gltf/glb

[fzlavr]

Hi, i have a problem in conversion into gltf and glb. i have put all the material (.obj , .mtl , .jpg) into one folder then i convert it with basic command like this obj2gltf -i model.obj -o model.gltf But, the result is like this https://imgur.com/oH5nueG all side of the object turn into black and seems like the texture and color are not convert well.. is there anything that i miss when converting ?

FYI, this is my files which i want to convert.. https://imgur.com/9zzlG4g

[fzlavr]

it solved.. my model has the texture and its color.. i should put --materialsCommon after the model name of gltf. So, it should be like this obj2gltf -i model.obj -o model.gltf --materialsCommon

[lilleyse]

Good that you solved it. Eventually we will add support for unlit materials https://github.com/AnalyticalGraphicsInc/obj2gltf/issues/130, so in the future you might be using --unlit instead of --materialsCommon.

[CrashedBboy]

Hi @fzlavr and @lilleyse ,

I've checked the option --materialsCommon's description out:

The glTF will be saved with the KHR_materials_common extension.

Why the missing of texture is related to this option? So, every model with texture should be converted with this option in order to keep the texture?

[lilleyse]

The --materialsCommon option isn't required. The main issue was a Cesium bug where models without normals would get rendered as black. That was recently fixed in https://github.com/AnalyticalGraphicsInc/cesium/pull/6501.

So try without --materialsCommon and load the model in Cesium master, it should render correctly now.

[miguelfernandesidesign]

Hello, I'm facing the same problem. Which program are using to convert?

Thank you