Is it possible to bake all the mesh maps of a mesh with multiple materials at once using sbsbaker ?

[emnrdl]

When I assign materials in Substance Painter and import an object, all materials are listed separately, and I can bake them individually. However, when I tried to do this using sbsbaker through the command line, it didn’t work the same way.

The best solution I found was to create a separate JSON file for each mesh part using a Python script and then modify the --input-selection parameter to select each mesh part individually for baking. However, since it reloads the mesh every time, this greatly extends the bake time. Is there a way to solve this issue and speed up the process?

[Luca Giarrizzo · Accepted solution]

Hello,

It is possible to list the same baker multiple times in a JSON file, each with a different 'input-selection' parameter value.

In a JSON file, any parameter written out of a baker group is global and applies to all bakers listed. A parameter in a baker group is specific to that baker.

Considering this, here is an example:

{
    "MeetMat Arms - Position": {
        "baker": "position-from-mesh",
        "parameters": {
            "input-selection": "arms_msh",
            "output-name": "{inputName}_{bakerName}_arms",
        },
    },
    "MeetMat Arms - Head": {
        "baker": "position-from-mesh",
        "parameters": {            
            "input-selection": "head_msh",
            "output-name": "{inputName}_{bakerName}_head",
        },
    },
    "apply-diffusion": false,
    "average-normals": true,
    "cage-mesh": "",
    "dilation-width": 4,
    "ignore-backface": false,
    "inputs": "#####/3d_scenes/fbx/meet_mat_2019.fbx",
    "match": 0,
    "max-frontal": 0.1,
    "max-rear": 0.05,
    "output-format": "png",
    "output-path": "#####/bakers_multi_material",
    "output-size": {
        "height": 9,
        "width": 10
    },
    "relative-to-bbox": true,
    "skew-correction": false,
    "skew-map": "",
    "use-lowdef-as-highdef": true,
    "uv-set": 0
}

To go further, you can dynamically build JSON files or SBSBaker commands by parsing mesh information, using SBSBaker's 'info' command.

Here is an example, and its output: (Some paths were replaced with '#####' for privacy)

$ ./sbsbaker info --inputs #####/3d_scenes/fbx/meet_mat_2019.fbx

[WARNING][SceneGraph/Options]Not tangent space generator found.
File "#####/3d_scenes/fbx/meet_mat_2019.fbx":
  Entity "arms_msh":
    Label: arms_msh
    Enabled: 1
    Bounding box:
      Minimal point: (-4.078,3.356,-0.8994)
      Maximal point: (4.078,7.27,0.8746)
      Center: (0,5.313,-0.01237)
      Size: (8.156,3.913,1.774)
    Location:
      Local transformation: [1, 0, 0, 0; 0, 1, 0, 0; 0, 0, 1, 0; 0, 0, 0, 1]
      Global transformation: [1, 0, 0, 0; 0, 1, 0, 0; 0, 0, 1, 0; 0, 0, 0, 1]
    Mesh:
      Name: arms_msh
      Number of vertices: 25152
      UV 0:
        Contained within unit square: 1
        Number of points: 25152
        UV tiles : 0x0 
        Udim tiles : 1001 
      Submesh "arms_shd"
        Label arms_shd
        Color: ColorRGBA(0.5,0.5,0.5,1)
        Number of triangles: 8384
  Entity "head_msh":
    Label: head_msh
    Enabled: 1
    Bounding box:
      Minimal point: (-3.771,6.917,-3.211)
      Maximal point: (3.771,14.46,3.425)
      Center: (3.576e-07,10.69,0.1068)
      Size: (7.542,7.542,6.636)
    Location:
      Local transformation: [1, 0, 0, 0; 0, 1, 0, 0; 0, 0, 1, 0; 0, 0, 0, 1]
      Global transformation: [1, 0, 0, 0; 0, 1, 0, 0; 0, 0, 1, 0; 0, 0, 0, 1]
    Mesh:
      Name: head_msh
      Number of vertices: 65280
      UV 0:
        Contained within unit square: 1
        Number of points: 65280
        UV tiles : 0x0 
        Udim tiles : 1001 
      Submesh "head_shd"
        Label head_shd
        Color: ColorRGBA(0.5,0.5,0.5,1)
        Number of triangles: 21760
  Entity "base_msh":
    Label: base_msh
    Enabled: 1
    Bounding box:
      Minimal point: (-4.126,-7.451e-08,-4.762)
      Maximal point: (4.126,1.034,4.762)
      Center: (0,0.517,-1.478e-05)
      Size: (8.252,1.034,9.523)
    Location:
      Local transformation: [1, 0, 0, 0; 0, 1, 0, 0; 0, 0, 1, 0; 0, 0, 0, 1]
      Global transformation: [1, 0, 0, 0; 0, 1, 0, 0; 0, 0, 1, 0; 0, 0, 0, 1]
    Mesh:
      Name: base_msh
      Number of vertices: 39384
      UV 0:
        Contained within unit square: 1
        Number of points: 39384
        UV tiles : 0x0 
        Udim tiles : 1001 
      Submesh "base_shd"
        Label base_shd
        Color: ColorRGBA(0.5,0.5,0.5,1)
        Number of triangles: 13128
  Entity "body_msh":
    Label: body_msh
    Enabled: 1
    Bounding box:
      Minimal point: (-3.015,1.029,-1.624)
      Maximal point: (3.012,7.568,1.622)
      Center: (-0.001507,4.299,-0.0005714)
      Size: (6.027,6.539,3.246)
    Location:
      Local transformation: [1, 0, 0, 0; 0, 1, 0, 0; 0, 0, 1, 0; 0, 0, 0, 1]
      Global transformation: [1, 0, 0, 0; 0, 1, 0, 0; 0, 0, 1, 0; 0, 0, 0, 1]
    Mesh:
      Name: body_msh
      Number of vertices: 26736
      UV 0:
        Contained within unit square: 1
        Number of points: 26736
        UV tiles : 0x0 
        Udim tiles : 1001 
      Submesh "body_shd"
        Label body_shd
        Color: ColorRGBA(0.5,0.5,0.5,1)
        Number of triangles: 8912

I hope this is helpful!

Best regards.

[emnrdl]

Thank you for your reply  i try this and work perfectly thank you