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    <p>I think what your looking for is actually <a href="http://en.wikipedia.org/wiki/Parallax_mapping" rel="noreferrer">Parallax mapping</a> (Or Parallax Occlusion mapping).</p> <p>Demos:<br/> <a href="http://www.youtube.com/watch?v=01owTezYC-w" rel="noreferrer">http://www.youtube.com/watch?v=01owTezYC-w</a><br/> <a href="http://www.youtube.com/watch?v=gcAsJdo7dME&amp;NR=1" rel="noreferrer">http://www.youtube.com/watch?v=gcAsJdo7dME&amp;NR=1</a><br/> <a href="http://www.youtube.com/watch?v=njKdLvmBl88" rel="noreferrer">http://www.youtube.com/watch?v=njKdLvmBl88</a><br/></p> <p>Parralax mapping basically works by using the height map to alter the texture UV coordinate being used.</p> <p>The main disadvantage to parallax is that anything that appears to be 'outside' the polygon will be clipped (think of looking at an image on a 3D tv), so it's best for things indented in a surface rather than sticking out of it (although you can reduce this by making the polygon lager than the visible texture area). It's also fairly complex and would need to be combined with other shader techniques for a good effect.</p> <p>Bump mapping works by using a texture for normal's, this makes the light's shading appear to be 3D however it does not change 3D data depending on the position of the viewer only the shading. Bump mapping would also be fairly useless for the OP's sample image since the surface is all the same angle just at different heights, bump mapping relies on the changes in the surfaces angles. You would have to slope the edges like <a href="http://www.filterforge.com/filters/7582-normal.html" rel="noreferrer">this</a>.</p> <p>Displacement mapping/tessellation uses a texture to generate more polygons rather than just being 1 polygon.</p> <p>There's a video comparing all 3 <a href="http://www.youtube.com/watch?v=tnbYdkm1V4k" rel="noreferrer">here</a></p> <p>EDIT: There is also <a href="http://en.wikipedia.org/wiki/Relief_mapping_(computer_graphics)" rel="noreferrer">Relief mapping</a>, which is a similar to parallax. See <a href="http://www.youtube.com/watch?v=_erYebogWUw&amp;feature=related" rel="noreferrer">demo</a>. There's a <a href="http://www.youtube.com/watch?v=FNnPFLb6YOg" rel="noreferrer">comparison video</a> too (it's a bit lowquality but relief looks like it gives better depth).</p>
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    1. USDavid C. Bishop
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