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As per discussion here in ee946579

Promoting VTKLoader2 into VTKLoader (VTKLoader2 loads more samples than VTKLoader and is easier to maintain). 

Now it handles files with random number of spaces between numbers.

People seem to struggle with this.

We'll see if this works out :P

Anaglyph and ParallaxBarrier could also be merged somehow, as the only change is the fragment shader.

Not sure if this should be enabled by default though.

Useful for tracking WebGL API calls overhead.

As per discussion in https://github.com/mrdoob/three.js/commit/08a37d34c16d3ccd19191251edd945be62a9f3e8

See discussion here: https://github.com/mrdoob/three.js/commit/6e002f324a06f6f766b50c930732a9994fdd4ac6#commitcomment-1234473

defaults to quads instead of triangles in ParametricGeometry. Also not using mergeVertices by defaults.

refactored parametric argument signature. new THREE.ParametricGeometry( parametricFunction, uSements, ySegements, useQuads );

This should fix doubleSided objects causing misbehaved shadows reported in #1758.