attribute vec3 r_position;
attribute vec3 a_position;

attribute vec3 quaternion;

uniform vec3 u_quantizedVolumeScale;

void main() {
    vec3 s_quaternion = quaternion / 127.0;
    float w = pow(1.0 - (pow(s_quaternion.x, 2.0) + pow(s_quaternion.y, 2.0) + pow(s_quaternion.z, 2.0)), 0.5);

    vec3 translation = r_position / 32.0;
    translation = 2.0 * dot(s_quaternion, translation) * s_quaternion
            + (w * w - dot(s_quaternion, s_quaternion)) * translation
            + 2.0 * w * cross(s_quaternion, translation);


    vec3 position = a_position * u_quantizedVolumeScale;
    position += translation;
    gl_Position = czm_modelViewProjection * vec4(position, 1.0);
}