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I have a sculpture with 250,000 vertices and I select the head (70,000 vertices) I would like to rotate the head 12 degrees around the z axis with proportional editing enabled so the neck and upper torso twist with it, when I do this Blender crashes on my computer. Is there any way around this problem? One way that seems to work is to deselect 95% of the vertices on the head, the trouble is I only know how to do this one vertice at a time!

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    $\begingroup$ Maybe you coud add an armature to the model and use it to move the head. Then you could apply the armature modifier. $\endgroup$ – maddin45 Mar 14 '15 at 16:29
  • $\begingroup$ why don't you use bones to move a head? $\endgroup$ – Scalia Mar 14 '15 at 16:32
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    $\begingroup$ Maybe try with lattice modifier? $\endgroup$ – Denis Mar 14 '15 at 16:45
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    $\begingroup$ VBO means Vertex Buffer Object. It's a method use in openGL (viewport) to store geometry information. This option can make the viewport faster. Not enough in your case. Did u deactivate any subsurf/multires visibility? $\endgroup$ – Bithur Mar 14 '15 at 16:49
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    $\begingroup$ OK I've got it sorted, I did a random select set to 1% and then deselected with C all the vertices except for those of the head.The head rotated with PE with barely a lag! $\endgroup$ – user5049 Mar 14 '15 at 17:46
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It would probably be better to use a lattice modifier but if you wish to deselect vertices the following method seems to work for this example. Select the area you wish to manipulate then go to the 3D viewport header choose: Select > Random, go to the bottom of the tool shelf: enter Percent> 99% (for example) and Action> Deselect.You may need to add a few vertices to fill in any gaps. You can now manipulate using the proportional editing tool set to a largeish fall off without unwelcome lag or crashes.

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