I did your first solution, and here is the new error I’ve got:
> Exporter version: 6.1.1, Blender version: 2.80 (sub 74)
> ========= Conversion from Blender to Babylon.js =========
> Scene settings used :
> inline textures : false
> Material Type : PBR
> Positions Precision : 4
> Normals Precision : 3
> UVs Precision : 3
> Vert Color Precision: 3
> Mat Weight Precision: 2
> texture directory : D:\Creation\Gamedev\BabylonJS\Maze-Project\Maze-Demo\misc\3D\NewWorld1\
> Python World class constructor completed
> WARNING: No active camera has been assigned, or is not in a currently selected Blender layer
> processing begun of node: 5_0
> processing begun of mesh: 5_0_00_MSH
> processing begun of material: Bark
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.0509 secs
> Custom split normals with tangents being used
> num positions : 1161
> num normals : 1161
> num tangents : 1161
> num uvs : 2322
> num uvs2 : 0
> num colors : 0
> num indices : 1161
> processing begun of node: 7_0
> processing begun of mesh: 7_0_01_MSH
> processing begun of material: Bark
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.047 secs
> Custom split normals with tangents being used
> num positions : 1161
> num normals : 1161
> num tangents : 1161
> num uvs : 2322
> num uvs2 : 0
> num colors : 0
> num indices : 1161
> processing begun of node: 17_0
> processing begun of mesh: 17_0_02_MSH
> processing begun of material: Bark
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.0719 secs
> Custom split normals with tangents being used
> num positions : 1548
> num normals : 1548
> num tangents : 1548
> num uvs : 3096
> num uvs2 : 0
> num colors : 0
> num indices : 1548
> processing begun of node: 31_0
> processing begun of mesh: 31_0_03_MSH
> processing begun of material: Bark
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.027 secs
> Custom split normals with tangents being used
> num positions : 774
> num normals : 774
> num tangents : 774
> num uvs : 1548
> num uvs2 : 0
> num colors : 0
> num indices : 774
> processing begun of node: 127_0
> processing begun of mesh: 127_0_04_MSH
> processing begun of material: Bark
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.008 secs
> Custom split normals with tangents being used
> num positions : 129
> num normals : 129
> num tangents : 129
> num uvs : 258
> num uvs2 : 0
> num colors : 0
> num indices : 129
> processing begun of node: 255_0
> processing begun of mesh: 255_0_05_MSH
> processing begun of material: Grass
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.006 secs
> Custom split normals with tangents being used
> num positions : 96
> num normals : 96
> num tangents : 96
> num uvs : 192
> num uvs2 : 0
> num colors : 0
> num indices : 96
> processing begun of node: 95_0
> processing begun of mesh: 95_0_06_MSH
> processing begun of material: Bark
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.009 secs
> Custom split normals with tangents being used
> num positions : 258
> num normals : 258
> num tangents : 258
> num uvs : 516
> num uvs2 : 0
> num colors : 0
> num indices : 258
> processing begun of mesh: 127_0_07_MSH
> processing begun of material: Grass
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.005 secs
> Custom split normals with tangents being used
> num positions : 90
> num normals : 90
> num tangents : 90
> num uvs : 180
> num uvs2 : 0
> num colors : 0
> num indices : 90
> processing begun of mesh: 127_0_08_MSH
> processing begun of material: Path
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.005 secs
> Custom split normals with tangents being used
> num positions : 48
> num normals : 48
> num tangents : 48
> num uvs : 96
> num uvs2 : 0
> num colors : 0
> num indices : 48
> processing begun of mesh: 127_0_09_MSH
> processing begun of material: Leaves
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.011 secs
> Custom split normals with tangents being used
> num positions : 318
> num normals : 318
> num tangents : 318
> num uvs : 636
> num uvs2 : 0
> num colors : 0
> num indices : 318
> processing begun of mesh: 17_0_10_MSH
> processing begun of material: Grass
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.006 secs
> Custom split normals with tangents being used
> num positions : 96
> num normals : 96
> num tangents : 96
> num uvs : 192
> num uvs2 : 0
> num colors : 0
> num indices : 96
> processing begun of mesh: 17_0_11_MSH
> processing begun of material: Path
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.004 secs
> Custom split normals with tangents being used
> num positions : 48
> num normals : 48
> num tangents : 48
> num uvs : 96
> num uvs2 : 0
> num colors : 0
> num indices : 48
> processing begun of mesh: 17_0_12_MSH
> processing begun of material: Leaves
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.3756 secs
> Custom split normals with tangents being used
> num positions : 3816
> num normals : 3816
> num tangents : 3816
> num uvs : 7632
> num uvs2 : 0
> num colors : 0
> num indices : 3816
> processing begun of mesh: 31_0_13_MSH
> processing begun of material: Grass
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.005 secs
> Custom split normals with tangents being used
> num positions : 96
> num normals : 96
> num tangents : 96
> num uvs : 192
> num uvs2 : 0
> num colors : 0
> num indices : 96
> processing begun of mesh: 31_0_14_MSH
> processing begun of material: Path
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.004 secs
> Custom split normals with tangents being used
> num positions : 48
> num normals : 48
> num tangents : 48
> num uvs : 96
> num uvs2 : 0
> num colors : 0
> num indices : 48
> processing begun of mesh: 31_0_15_MSH
> processing begun of material: Leaves
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.1119 secs
> Custom split normals with tangents being used
> num positions : 2034
> num normals : 2034
> num tangents : 2034
> num uvs : 4068
> num uvs2 : 0
> num colors : 0
> num indices : 2034
> processing begun of mesh: 5_0_16_MSH
> processing begun of material: Grass
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.005 secs
> Custom split normals with tangents being used
> num positions : 90
> num normals : 90
> num tangents : 90
> num uvs : 180
> num uvs2 : 0
> num colors : 0
> num indices : 90
> processing begun of mesh: 5_0_17_MSH
> processing begun of material: Path
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.006 secs
> Custom split normals with tangents being used
> num positions : 48
> num normals : 48
> num tangents : 48
> num uvs : 96
> num uvs2 : 0
> num colors : 0
> num indices : 48
> processing begun of mesh: 5_0_18_MSH
> processing begun of material: Leaves
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.2447 secs
> Custom split normals with tangents being used
> num positions : 3102
> num normals : 3102
> num tangents : 3102
> num uvs : 6204
> num uvs2 : 0
> num colors : 0
> num indices : 3102
> processing begun of mesh: 7_0_19_MSH
> processing begun of material: Grass
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.005 secs
> Custom split normals with tangents being used
> num positions : 90
> num normals : 90
> num tangents : 90
> num uvs : 180
> num uvs2 : 0
> num colors : 0
> num indices : 90
> processing begun of mesh: 7_0_20_MSH
> processing begun of material: Path
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.004 secs
> Custom split normals with tangents being used
> num positions : 48
> num normals : 48
> num tangents : 48
> num uvs : 96
> num uvs2 : 0
> num colors : 0
> num indices : 48
> processing begun of mesh: 7_0_21_MSH
> processing begun of material: Leaves
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.2408 secs
> Custom split normals with tangents being used
> num positions : 3102
> num normals : 3102
> num tangents : 3102
> num uvs : 6204
> num uvs2 : 0
> num colors : 0
> num indices : 3102
> processing begun of mesh: 95_0_22_MSH
> processing begun of material: Grass
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.005 secs
> Custom split normals with tangents being used
> num positions : 102
> num normals : 102
> num tangents : 102
> num uvs : 204
> num uvs2 : 0
> num colors : 0
> num indices : 102
> processing begun of mesh: 95_0_23_MSH
> processing begun of material: Path
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.004 secs
> Custom split normals with tangents being used
> num positions : 66
> num normals : 66
> num tangents : 66
> num uvs : 132
> num uvs2 : 0
> num colors : 0
> num indices : 66
> processing begun of mesh: 95_0_24_MSH
> processing begun of material: Leaves
> WARNING: unsupported node type(ShaderNodeAddShader) will trigger baking
> bake time: 0 min, 0.023 secs
> Custom split normals with tangents being used
> num positions : 702
> num normals : 702
> num tangents : 702
> num uvs : 1404
> num uvs2 : 0
> num colors : 0
> num indices : 702
> ========= Writing of JSON file started =========
> ========= An error was encountered =========
> File "C:\Users\geoff\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\babylon_js\json_exporter.py", line 154, in execute
> self.to_json_file()
> File "C:\Users\geoff\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\babylon_js\json_exporter.py", line 183, in to_json_file
> material.to_json_file(file_handler)
> File "C:\Users\geoff\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\babylon_js\materials\material.py", line 281, in to_json_file
> write_color(file_handler, 'emissiveIntensity', self.bjsNodeTree.emissiveIntensity)
> File "C:\Users\geoff\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\babylon_js\package_level.py", line 279, in write_color
> file_handler.write(',"' + name + '":[' + format_color(color, precision) + ']')
> File "C:\Users\geoff\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\babylon_js\package_level.py", line 159, in format_color
> return format_float(color[0], fmt) + ',' + format_float(color[1], fmt) + ',' + format_float(color[2], fmt)
> ERROR: 'float' object is not subscriptable
> ========= end of processing =========
> elapsed time: 0 min, 1.7832 secs
Also, is it possible not to trigger the baking?