Hi Jon, > Another thing is that the results of the contouring are sent out in groups of > 3 points which are the vertices of triangles forming the surface. Hence, I > orthogonalize them and get three.js to draw them as just that - triangles. My > worry is that, since the triangles all have edges in common, nearly all of > the contour lines (except the ones at the edges of the map box) get drawn > twice, or at least are sent to three.js twice for drawing, which doesn't seem > terribly efficient?! Is there a nicer way of doing this?
I was also concerned about it when writing UglyMol. It was ~6 years ago. Drawing maps as lines was definitely affecting speed, because fps was lower when the number of lines was huge. So to reduce duplicated lines I calculated new tables for the marching cubes algorithms - with lines instead of triangles in the tables. This allowed me to reduce some (most of?) duplicates. I don't remember the details, but the script that I used for calculating tables is here: https://github.com/uglymol/uglymol/blob/master/tools/isolut.py Then I was disappointed, because it didn't change the fps. I don't know why. And I don't know how to check where the bottleneck in the graphics pipeline is (vertex shader, fragment shader or something else?). I guess optimizing map rendering would require someone with expertise in 3D graphics rendering. > Finally, its been asked before, but is there a nice way in CCP4i2 to output > maps that cover the coordinates of the structure, rather than the asymmetric > unit? The maps that cover asu are, on average, smaller. They contain the list of symmetry operators that expand the map to the whole unit cell. So such maps may actually be better. Or, even better, use MTZ files. I think UglyMol is still the only web viewer that can show maps from MTZ, but it works on mobile web browsers (it's not designed for mobile, but rendering works) and you can re-use parts of it. https://uglymol.github.io/view/ Best wishes, Marcin ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 This message was issued to members of www.jiscmail.ac.uk/CCP4BB, a mailing list hosted by www.jiscmail.ac.uk, terms & conditions are available at https://www.jiscmail.ac.uk/policyandsecurity/
