Matcap material glsl

matcapmaterial.js

/* Vertex shader */

vNormal = normalize(vec3(world * vec4(normal, 0.0))); // Normal in model 


/* Fragment shader */

// Move normal to view space
highp vec2 muv = vec2(view * vec4(normalize(vNormal), 0))*0.5+vec2(0.5,0.5);
// read texture inverting Y value
gl_FragColor = texture2D(matcapTexture, vec2(muv.x, 1.0-muv.y));