Material Merger

Posted Aug 8, 2012
Last Updated Jun 2, 2020

This MAXScript utility allows you to flatten all the materials of all selected objects into a single material where all shared map channels of the original materials are composited and flattened into single maps in the final material. It's a utility for use inside 3ds Max.

Even though there are some solutions already out there, I wrote this tool to handle my own personal preference with dealing with the problems presented by the limitations of RTT. For alternate and related tools, see bottom of page.


This tool will be included in an upcoming version of Wall Worm. But you can also download it individually here.

  1. Download Wall Worm Material Merger
  2. Place it into your Scripts folder
  3. Run the script by clicking MAXScript > Run Script and browsing to the file

Material Merger UI


    Steps prefixed with * are optional and are dependant on your material/model setup.

    1. Select any object or group of objects that have materials rendered out into the same UVW space. For example, if you have a group of buildings that each have their own materials but are sharing the same instanced Unwrap UVW modifier, they can be used for this tool.
    2. *While all objects are selected, Render to Texture all of the materials.
    3. Open Wall Worm Material Merge (either through Wall Worm or via the MAXScript > Run Script and choosing
    4. Click Create Composite From Selection. This will create a Material where all your materials have been reduced into one material where all the maps are now layers in a Composite map.
    5. Choose a Base Name for your output bitmaps. A good idea would be something that related to the model or collection of models.
    6. Choose the output path for the bitmaps.
    7. Select the appropriate bitmap file type. The default is TGA.
    8. Choose the output bitmap filesize. The default is 1024.
    9. Select the appropriate UVW Channel.
    10. Click Flatten Maps. Now there will be bitmaps in the target output directory. NOTE: this will overwrite bitmaps you already made for any previous materials that used the same base name and output directory!
    11. * Select the originally selected objects and click Assign Flattened to give the objects the new flattened material.

    Tips and Hints

    • The following list of materials are supported:
      • Standard
      • Mult/Sub-Object
      • Shell
      • DirectX_Shader
    • When using objects with the material types listed above, the used materials will always be a Standard Material. The standard material used for Shell will be collected from the Baked Material and the one used for a DirectX_Shader will be the Render Material. The function collects these materials recursively.
    • When you flatten maps, you need to make sure that you assign the correct UVW channel used in your object(s). You do that with the Channel spinner before* you press Flatten Maps. If you do not do this and apply the material to objects with the Assign Flattened button, the materials will display improperly.
    • If you forgot to set the correct UVW channel, you can change the channel spinner to the correct channel and then click Update Channel.
    • As with most of my tools, most buttons and UI input fields have tool tips if you hover your mouse over them.
    • This tool was integrated into Wall Worm 1.852. After updating Wall Worm and running any WW function, you will then find it in the updated menu under Wall Worm > Wall Worm Utilities > Material Merger.


    Version 1.2

    • Added Material Shader Type menu to choose the output material Shader Type.
    • Added more texture maps to look for.
    • Added experimental support for VRay Materials.
    • Added minor error checking logic.

    Version 1.1

    • Added Open button to open the output directory.
    • Updated the Channel spinner to get remembered between sessions.
    • Updated file writing to allow for base names with slashes... the output files will get put into subfolders.
    • Changed naming of materials. Now the flattened material will match exactly the Base Name.
    • Bitmap nodes now also get the Base Name as the node name.
    • Added Shell checkbox. When checked, the Assign Flattened button will preserve the exisitng selections' materials but move them into the original material of a Shell Material. The flattened material is assigned to the shell material's Baked Material slot.

    Version 1.0

    • Initial Release

    Related Links and Tools

    There are already some utilities out there that do some of the things this tool does. Here are some of them along with related, relevant other tools.

    Tools with similar functionality:
    Tools of interest:


      No HTML Tags are permitted.

      Toby O'Brien

      Jul 22, 2016

      Hi, thanks for a useful tool (
      Material Merger) but when I go to use this inside of 3D Max 2016 all it does is create one complete render of an image (I used a composite material). It doesn't render all the separate uvs from the output of render texture at all. I mean it just renders out a complete material with no uvs on there.

      Was wondering is it me, 3D Max or something else please.

      Cheers for any feedback. Toby.

      Shawn Olson

      Aug 8, 2016

      Hi, sorry for not responding sooner.

      Material Merger was built mainly to composite materials from multiple objects that were already baked with an instanced Unwrap UVW that would bake all the textures for each object separately instead of into a single texture. I personally use Flatiron for that now, but Material Merger is what I made before I owned Flatiron.


      Aug 15, 2016

      Cheers for even replying, I honestly thought this was a dead post. But I have looked at Flatiron, but for now I have opted for the painful 3D Max eyeballing things until I can fund my way further.

      Appreciate the reply though, it was very kind.

      Shawn Olson

      Jan 5, 2013

      I updated the script to Version 1.2. See the changelog above for changes.

      One thing in the script is preliminary support for VRay. I don't own VRay so was shooting half-blind with this and can't test. So if you use the script with VRay let me know your results. I will probably add Mental Ray at some point too (which I can, luckily, test).
      Wall Worm plugins and scripts for 3ds Max