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varying highp vec3 pos;
void main() {
// This shader encodes the axis position into the vertex color, assuming the object
// is a cube filling the entire data area of the graph
gl_FragColor = vec4((pos.x + 1.0) / 2.0,
(pos.y + 1.0) / 2.0,
(-pos.z + 1.0) / 2.0,
0.0);
}