Ошибка синтаксиса!

<?
add_action( "wp_footer", "three_theme_wp_footer" );
 
function three_theme_wp_footer() {
?>
<script id="vs" type="x-shader/x-vertex">
    varying vec2 vUv;
    void main() {
        vUv = uv;
        gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 ); // <---
    }
</script>
 
<script id="fs" type="x-shader/x-fragment">
    uniform sampler2D map;
    uniform vec3 fogColor;
    uniform float fogNear;
    uniform float fogFar;
    varying vec2 vUv;
    void main() {
        float depth = gl_FragCoord.z / gl_FragCoord.w;
        float fogFactor = smoothstep( fogNear, fogFar, depth );
 
        gl_FragColor = texture2D( map, vUv );
        gl_FragColor.w *= pow( gl_FragCoord.z, 20.0 );
        gl_FragColor = mix( gl_FragColor, vec4( fogColor, gl_FragColor.w ), fogFactor );
    }
</script>
<?php
}
?>