loper

Loper · VFX, 3D & motion

Open .osl files on your Mac.

.osl

Shaders for Arnold, RenderMan, Cycles and V-Ray, in OSL's C-like syntax.

Loper is a free, minimal editor for macOS that opens Open Shading Language (.osl) 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.

Download Loper – freeAll formats
stripes.osl opened in Loper: Open Shading Language (.osl) with color-coded CTL / C
Show the file as text
// Simple stripe patternshader stripes(    color A = color(0.9, 0.9, 0.85),    color B = color(0.1, 0.1, 0.12),    float Frequency = 12.0,    output color Out = 0){    float s = mod(u * Frequency, 1.0);    Out = s < 0.5 ? A : B;}

How to open .osl files

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

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