/*
  uniform types: https://github.com/mrdoob/three.js/wiki/Uniforms-types
  THREE.Matrix4: http://threejs.org/docs/#Reference/Math/Matrix4
  https://github.com/mrdoob/three.js/issues/1188
*/

/*
  on Init();
  
  Add this uniform to your uniforms
  
  myModelViewMatrixInverse: { type: 'm4', value: new THREE.Matrix4() }

*/

material = new THREE.ShaderMaterial({ 
	uniforms: uniforms,
	vertexShader: document.getElementById( 'vertexShader' ).textContent,
	fragmentShader: document.getElementById( 'fragmentShader' ).textContent
} );
eyeGeoL = new THREE.Mesh(geometry, material );

/*
  on Render();
  camera.matrixWorldInverse * object.matrixWorld => modelViewMatrix
  the order might be wrong, I never get it right at first try
*/

var m = new THREE.Matrix4();
m.copy( eyeGeoL.matrixWorld );
m.multiply( camera.matrixWorldInverse );
var i = new THREE.Matrix4().getInverse( m );

eyeGeoL.material.uniforms.myModelViewMatrixInverse.copy( i );