Changes between Version 144 and Version 145 of requests

Timestamp:

Jun 3, 2011, 3:20:41 PM (15 years ago)

Author:

goddard

Comment:

--

requests

@@ -10 +10 @@
 Currently they include only those collected by Tom Goddard (focus on
 density maps, molecular assemblies, electron microscopy).
+</p>
+
+<p>
+311.
+<b>Smooth masked surfaces.</b><br>
+June 3, 2011<br>
+Ernesto Arias, Kelly Dryden<br>
+Is there anyway to smooth out the masked edge?  I end up with chopped voxels (looks like stair-steps), rather than getting an interpolated smooth surface at the edge?  When you mask volume data in Chimera using Volume Eraser or the mask command it sets the density values to zero outside the surface.  In places where high density crosses the surface the masked result looks horrible -- volume contour surface is jagged with stair-steps following the pattern of the volume grid.  I don't have any trick to make that surface look smooth.  I have two ideas about how to approach the problem.  One is to not have the density fall to zero immediately outside the surface.  If it rolled off gradually the contour surface of the masked data would look better.  I'm not optimistic that that will produce a good result.  The second approach is to do something different from masking.  Instead clip the
+volume surface with the sphere surface and cover the resulting holes with patches of the actual smooth sphere surface.  I think this would look very nice and the patches of sphere could be a different coloring which would give a nice visual indication that you have cut through high density.  I have not implemented either of these two ideas. 
 </p>