/**
 * DOC_TBA
 *
 * @name czm_columbusViewMorph
 * @glslFunction
 */
vec4 czm_columbusViewMorph(vec4 position2D, vec4 position3D, float time)
{
    // Just linear for now.
    vec3 p = mix(position2D.xyz, position3D.xyz, time);
    return vec4(p, 1.0);
}