    if (specialData == 1) gl_FragData[0] = vec4(vec3(fragNorm.z), gl_FragData[0].a);
    else if (specialData == 2)
    {
        float val = (.25 + dot(gl_FragData[0].rgb, grey) * .75) * temperature;
        gl_FragData[0] = vec4(val, val, val, gl_FragData[0].a);
    }
    else
    {
        float val = dot(gl_FragData[0].rgb, grey) * .125;
        gl_FragData[0] = vec4(val, val, val, gl_FragData[0].a);
    }