Hi Roger ... As a compromise, if you are normally scanning in lines parallel to the x-axis. Then you would only need to store the current and previous two...
2305
Adrian Rossiter
adrianrossiter
Nov 1, 2008 10:23 am
Hi Steve ... Does your FCC cell have a point at its centre? (If not, what was the calculation that gave the volume of 0.5?) ... They are included in the...
2306
Adrian Rossiter
adrianrossiter
Nov 1, 2008 10:49 am
Hi Roger ... This is a bug, here is the offending line (twice) geom.get_verts()->push_back(vec3d(i, k, j)); I must learn the alphabet! Adrian. -- Adrian...
2307
Adrian Rossiter
adrianrossiter
Nov 1, 2008 10:57 am
Hi Roger ... I will take a look at the program next week. Adrian. -- Adrian Rossiter adrian@... http://antiprism.com/adrian...
2308
stevewaterman51
Nov 1, 2008 11:38 am
Adrian, ... 1x1xroot2....having exactly a volume of 0.5. That was wrong...geez...it is rather 1 x root2 x root2 edges for the fcc that yield its .5 volume. ...
2309
Adrian Rossiter
adrianrossiter
Nov 1, 2008 11:49 am
Hi Steve ... But then 1 x root2 x root2 = 2 Does the cell you are thinking of have a point at its centre? ... Could you explain how you are doing this. Adrian....
2310
stevewaterman51
Nov 1, 2008 12:42 pm
Roger, In order to make that explosion program relevant to v,f,e,c it seems that since face centering is part and parcel of Antiprism already, that e and v and...
2311
stevewaterman51
Nov 1, 2008 1:01 pm
Adrian, ... Good question. i am confusing myself completely here. I have a drawing of an sc 1x1x1 cell. On the front face...i have drawn a square of edge root...
2312
Adrian Rossiter
adrianrossiter
Nov 1, 2008 3:41 pm
Hi Steve ... FCC is normlly thought of as having points on the face centres of the cubes. If you think of it as cuboctahedral arrangement of balls on the cubes...
2313
stevewaterman51
Nov 1, 2008 4:42 pm
Sorry, my brain has gotten up on the wrong side of bed ...this morning ... "In a lattice a primitive cell is a parallelepiped with vertices on lattice points,...
2314
vortexswirling
Nov 1, 2008 5:18 pm
Hi Steve, ... Actually this sort of thing has been requested in Stella for a long while and has never been done. With good specs, this doesn't seem like it...
2315
vortexswirling
Nov 1, 2008 7:57 pm
Hi Adrian, ... Realizing the z-points are tangent when they are equal to z of the centroid, I am rather anxious to put this into the z-intercept function....
2316
vortexswirling
Nov 2, 2008 1:14 pm
Hi Adrian, ... I quickly tried it this morning. The code change replaced the doubleEquality with an integer comparison z_near =...
2317
vortexswirling
Nov 2, 2008 9:44 pm
Hi Adrian, Using if (z_near == (int)floor(cz+epsilon)) { makes the function more reliable so I will let it in. It tests the same as the previous floating...
2318
stevewaterman51
Nov 3, 2008 1:17 pm
Adrian and Roger, I mentioned that I was going to look on the net for some other poly packings. I found this interesting site... ...
2319
vortexswirling
Nov 3, 2008 2:47 pm
Hi Adrian, (I wrote this note in Yahoo groups itself earlier and it ended up being rejected and sent to my email in box) ... long ... for ... enough ... Some...
2320
vortexswirling
Nov 3, 2008 9:51 pm
Hi Adrian, ... I just got this. I think you are saying there is an iterative method to find z. Roger...
2323
Adrian Rossiter
adrianrossiter
Nov 4, 2008 2:45 pm
Hi Roger ... That is right. Use the z values that you currently find as a starting point. Then, using long long integers, check each value to see if it is...
2324
Adrian Rossiter
adrianrossiter
Nov 4, 2008 3:00 pm
Hi Steve ... You are very welcome, and Kentyn is also welcome to use the source in his own program (permission is granted by the MIT Licence which is included...
2325
Adrian Rossiter
adrianrossiter
Nov 4, 2008 3:37 pm
Hi Steve ... All parallelepipeds will tile space. Adrian. -- Adrian Rossiter adrian@... http://antiprism.com/adrian...
2326
stevewaterman51
Nov 4, 2008 4:15 pm
Adrian, ... Thanks Adrian, indeed for already making this all public. I will see if he cares to join the forum at Antiprism next. I have only his initial...
2327
vortexswirling
Nov 4, 2008 4:17 pm
Hi Adrian, ... the ... When you say long long integers there are several that come to mind. Which are available to c++. I thought the 18 quintillion variety...
2328
Adrian Rossiter
adrianrossiter
Nov 4, 2008 5:08 pm
Hi Roger ... You are right! I think g++ supports it, but for any distribution the calculations would really need to be done in C. ... It isn't really different...
2329
vortexswirling
Nov 4, 2008 6:46 pm
Hi Adrian, ... was ... Would the whole program need to be extern C then? What is the highest available then, unsigned int? (unsigned long... I think long and...
2330
vortexswirling
Nov 5, 2008 1:34 am
Hi, There is an error in bravais extended help. I will edit it by something like this. Deleting the lines: "But this same logic would also argue that Face...
2331
Adrian Rossiter
adrianrossiter
Nov 5, 2008 11:06 am
Hi Roger ... I will add in the changes. Adrian. -- Adrian Rossiter adrian@... http://antiprism.com/adrian...
2332
Adrian Rossiter
adrianrossiter
Nov 5, 2008 11:37 am
Hi Roger ... Just the code that used long long would have to go into a C file, and this could be linked against the other C++ code. ... An int is at least as...
2333
vortexswirling
Nov 5, 2008 11:56 am
Hi Adrian, ... The actual printf's are below. I changed the wording a bit from last night. I decided not to introduce FCT and BCT as the program doesn't take...
2334
vortexswirling
Nov 5, 2008 12:52 pm
Hi, The Bravais vector and angle transformations of a=b=c and alpha=beta<>90<>gamma fits the Triclinic description. But Triclinic does not have 2 fold ...
2335
vortexswirling
Nov 5, 2008 3:37 pm
Hi Adrian, I have the angles alpha, beta, and gamma parallel to vectors a,b,c (which I correspond to x,y,z). But the convention is to have them perpendicular...
