twigDefault.onBeforeCompile = function ( shader ) {
    shader.uniforms.time = { value: 0 };
    shader.vertexShader = 'uniform float time;n' + shader.vertexShader;
    shader.vertexShader = shader.vertexShader.replace(
        '#include <begin_vertex>',
        [
            'float theta = sin( time + position.y ) / 300.0;', //300
            'float c = cos( theta );',
            'float s = sin( theta );',
            'mat3 m = mat3( c, 0, s, 0, 1, 0, -s, 0, c );',
            'vec3 transformed = vec3( position ) * m;',
            'vNormal = vNormal * m;'
        ].join( 'n' )
    );
    meshes.tree.shader = shader;
};

if (meshes.tree.shader) {
    meshes.tree.shader.uniforms.time.value = performance.now() / 1000;
}