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  1. PO
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    <p>If you don't want to convert to implicit surfaces (as described by @ananthonline), you can just tweak all the vertices based on the "magnet" strength and location. Note that the following will not create any new vertices, just attract existing ones; this could be an advantage or a disadvantage, depending on your application.</p> <p>Given a magnet location <code>M</code>, you can tweak each vertex <code>V</code> to a new location <code>V'</code> as follows:</p> <pre><code>point V = [incoming vertex] point M = [magnet location] float range = [chosen nominal range for the magnetic effect] float range2 = range * range [range squared, for comparison with squared distance] vector MV = V - M [vector from M to V] float alpha = range2 / (range2 + dot(MV, MV)) [weighting factor] point V' = alpha * M + (1-alpha) * V [new, "magnetized" position] </code></pre> <p>Vertices several times the <code>range</code> distance from <code>M</code> will be only minimally affected. Vertices within the <code>range</code> will be strongly attracted, but they won't go crazy. Each magnetized vertex will be somewhere on the line between <code>M</code> and its original position, which will create a "pucker" effect: the magnetized locations will be denser near the magnet, at the expense of the region they were attracted from.</p> <p>If you don't like the exact shape of the magnetic effect (e.g., if you want to make sure that vertices beyond a certain distance don't move at all), you can tweak the formula for <code>alpha</code>. Just make sure that <code>alpha</code> doesn't exceed <code>1</code>, and approaches <code>0</code> as the <code>dot(MV, MV)</code> becomes large.</p>
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    1. PO3d algorithm for "magnetic distortion" of vertices
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    1. COThanks! Not exactly sure what this would look like in JavaScript, but perhaps this is the answer.
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    2. COWould be a pleasure if you could also have a look at my try http://stackoverflow.com/questions/11141139/3d-algorithm-for-magnetic-distortion-of-vertices/11145657#11145657
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