move a camera position around globe three.js -


trying reposition camera on three.js globe have list of countries when clicked on return country's lat , lon. i've checked these , pretty sure thats being passed code below. click on country , camera moves new position, inside surface of globe. under correct country have zoom out. code using radius of globe held in var globeradius (just in case wasn't obvious).

console.log(cameratarget[0].lat,cameratarget[0].lon)    var phi = cameratarget[0].lat * math.pi / 180;   var theta = (cameratarget[0].lon + 90) * math.pi / 180;   posx = globeradius * math.cos(phi) * math.sin(theta);   posy = globeradius * math.sin(phi);   posz = globeradius * math.cos(phi) * math.cos(theta);   camera.position.set(posx,posy,posz);    camera.lookat(new three.vector3(0,0,0));

i'm 'm guessing have incorporate cameras height above globe in way. these initial camera settings

var fov = 45;   var near = 2;   var far = 4000;    // setup camera points center   var camera = new three.perspectivecamera(fov,width/height,near,far);   camera.position.set(posx,posy,posz);   camera.lookat(new three.vector3(0,0,0));

do need add width/height globalradius first example. if tell me nice transition method helpful also, thanks

here idea basic smooth rotation+zoom transition. having function parameters setup:

let perf: performance = window.performance; // init other necessary variables  var inittransition = function (longitude, latitude, animationtime, radius) {        begintime = perf.now();     animtime = animationtime * 1000;      beginphi = config.phi;     beginthetta = config.thetta;     beginzoomradius = config.zoomradius;      targetphi = latitude * math.pi / 180;     targetthetta = (longitude + 90) * math.pi / 180;     targetzoomradius = radius;       needstransitionanim = true;  }

perform in update loop:

update() { /* stuff */  computecurrentcamerapos(); setcameraposfromconfig(); }

where computecurrentcamerapos is:

var computecurrentcamerapos  = function() { if (needstransitionanim) {     t = (perf.now() - begintime) / speedtime;     if (t > 1) {         t = 1;         needstransitionanim = false;     }      config.phi = blendfunc (beginphi, targetphi, t);     config.thetta = blendfunc (beginthetta, targetthetta, t);     config.zoomradius = blendfunc (beginzoomradius, targetzoomradius, t);     } }

and setcameraposfromconfig self-explanatory. blendfunc(a, b, t) might whatever interpolation function (here got t in [0,1] , expect value in [a,b]).

keep in mind, considering orientation closest way a 2*m_pi - a lays through 0 if a < m_pi/2, example needs modified.


Comments

Post a Comment

Popular posts from this blog

html - Outlook 2010 Anchor (url/address/link) -

i'm trying link specific pdf page msoutlook'10 or msword'10, #page=... anchor particularly useful , works fine elsewhere. unfortunately when click [ctr-k] in outlook or winword, links re-formatted assuming unc path. pdf file located on shared drive. using "file:" prefix links open pdf in adobe reader (outside of browser), , "http:" open inside browser. issue seem need open in browser "file:" prefix in order anchor work. know anchors work inside browser. outlook uses windows/explorer default program (based on file extension) seems open in adobe reader neglecting anchor. is aware of solution, link specific page or bookmark of shared-pdf ms outlook and/or winword link? common references: mailermailer.com/...anchor-tags-html-emails campaignmonitor.com/...anchor-links-in-email-newsletters/ stackoverflow.com/...anchor-in-pdf-document
Read more

javascript - Why does running this loop 9 times take 100x longer than running it 8 times? -

consider code: test = function() { } t = new test(); (var = 0; < 8; i++) { result = t instanceof test; } if change number of iterations 8 9 , loop take 100 times longer complete in latest version of firefox (41.0.1). tested on 2 different pcs , magic limit 8. here jsperf test used: http://jsperf.com/instanceof-8-times-vs-9-times does have idea why might happen? seems specific instanceof . not happen if else object, example check property. note: filed bugzilla bug this. jan de mooij mozilla team has posted details in bugzilla thread . here's simplistic interpretation of highly technical answers: in i < 8 case, firefox smart enough hoist result = t instanceof test; statement out of loop (according tests, doesn't seem omit altogether). in i < 9 case, apparently doesn't optimization . why? reason not clear, related fact 9 iterations threshold above function considered "hot" enough run through jit compiler. i < 8 cas...
Read more

Getting gateway time-out Rails app with Nginx + Puma running on Digital Ocean -

following this guide setup app on digital ocean droplet, not working. site not loading , it's throwing: "gateway time-out". the puma server works, since ps aux | grep puma prints: root 15878 0.0 0.4 376832 2168 ? sl 12:50 0:00 puma 2.13.4 (unix:///var/www/myapp/shared/tmp/sockets/myapp-puma.sock) [20150930164940] root 15881 0.0 0.7 903676 3692 ? sl 12:50 0:06 puma: cluster worker 0: 15878 [20150930164940] root 24654 0.0 0.1 11748 916 pts/2 s+ 18:00 0:00 grep --color=auto puma my nginx config: user root; worker_processes 1; events { worker_connections 1024; } http { upstream puma { server unix:///var/www/myapp/shared/tmp/sockets/myapp-puma.sock; } server { listen 80; server_name myapp.com; root /var/www/myapp/current/public; access_log /var/www/myapp/current/log/access.log; error_log /...
Read more