How to export obj/fbx/json file for three.js with the second uv(lightmap)? -

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the second layer uv used map lightmap onto models in scene. when work second uv done in 3d max, can export these information obj/fbx/json file can loaded directly three.js?

here example provided threejs.org https://threejs.org/examples/?q=lightmap#webgl_materials_lightmap when looking file "obj/lightmap/lightmap.js", can see somes properties such "maplight".

so question how json file created? there exporters can export maplight property? have tried export second uv 3d max using obj , fbx format, doesn't work.





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