text: var EarthVertexShader = `
  
  	varying vec2 vUv;
  	varying vec3 vNormal;
      varying vec3 vPos;
  
  	void main()
  	{
  
  		vUv = uv;
  		vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
  		vPos = mvPosition.xyz;
  		vNormal = normalMatrix * normal;
  		gl_Position = projectionMatrix * mvPosition;
  	}
  
  `;