#version 300 es

// fragment shaders don't have a default precision so we need
// to pick one. mediump is a good default. It means "medium precision"
precision mediump float;

in vec4 pos;
in vec3 baseColor;
in vec3 maxColor;
out vec4 outColor;

void main() {
    float y = pos.z;
    if (y < 0.0) {
        y = y * -1.0;
    }
    vec3 color = mix(baseColor, maxColor, y);
    outColor = vec4(color, 1.0);
}