loper

Loper · VFX, 3D & motion

Open .mtlx files on your Mac.

.mtlx

Look-dev materials shared across Houdini, Maya, Blender and USD: shader nodes and their inputs.

Loper is a free, minimal editor for macOS that opens MaterialX (.mtlx) instantly and colors every part of the file, so you find the value you need at a glance and can fix it right there. No IDE, no project to load, no gray wall of text.

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car_paint.mtlx opened in Loper: MaterialX (.mtlx) with color-coded XML
Show the file as text
<?xml version="1.0"?><materialx version="1.39">  <standard_surface name="SR_car_paint" type="surfaceshader">    <input name="base_color" type="color3" value="0.62, 0.05, 0.04"/>    <input name="metalness" type="float" value="0.4"/>    <input name="specular_roughness" type="float" value="0.18"/>    <input name="coat" type="float" value="1.0"/>  </standard_surface>  <surfacematerial name="M_car_paint" type="material">    <input name="surfaceshader" type="surfaceshader" nodename="SR_car_paint"/>  </surfacematerial></materialx>

How to open .mtlx files

  1. Download Loper (free, Apple silicon, signed and notarized) and move it to Applications.
  2. Double-click your .mtlx file, drag it onto the Loper window, or right-click it and choose Open With › Loper.
  3. Want every .mtlx file to open in Loper? Choose Loper › Make Loper the Default Editor….

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