java - Detecting planes and tap events with ARCore -


i'm trying understand google's arcore api , pushed sample project (java_arcore_hello_ar) github.

in example, when deploy app android, horizontal surfaces/planes detected. if tap on detected plane, "andy" andrid robot rendered in location tap. pretty cool.

i'm trying find in code:

  1. thats horizontal surface/plane gets detected; and
  2. where logic lives resize & re-orient andy correctly (i assume if point tap further away camera, rendered small, etc.)

i believe when planes detected, android framework calls onsurfacecreated method:

@override public void onsurfacecreated(gl10 gl, eglconfig config) {     gles20.glclearcolor(0.1f, 0.1f, 0.1f, 1.0f);      // create texture , pass arcore session filled during update().     mbackgroundrenderer.createonglthread(/*context=*/this);     msession.setcameratexturename(mbackgroundrenderer.gettextureid());      // prepare other rendering objects.     try {         mvirtualobject.createonglthread(/*context=*/this, "andy.obj", "andy.png");         mvirtualobject.setmaterialproperties(0.0f, 3.5f, 1.0f, 6.0f);          mvirtualobjectshadow.createonglthread(/*context=*/this,             "andy_shadow.obj", "andy_shadow.png");         mvirtualobjectshadow.setblendmode(blendmode.shadow);         mvirtualobjectshadow.setmaterialproperties(1.0f, 0.0f, 0.0f, 1.0f);     } catch (ioexception e) {         log.e(tag, "failed read obj file");     }     try {         mplanerenderer.createonglthread(/*context=*/this, "trigrid.png");     } catch (ioexception e) {         log.e(tag, "failed read plane texture");     }     mpointcloud.createonglthread(/*context=*/this); }

however code looks like assumes user has tapped on surface. i'm not seeing if-conditional says "render andy if user has tapped on detected plane/surface.". can spot might happening?

the tap detection done in mgesturedetector:

mgesturedetector = new gesturedetector(this, new gesturedetector.simpleongesturelistener() {     @override     public boolean onsingletapup(motionevent e) {         onsingletap(e);         return true;     }      @override     public boolean ondown(motionevent e) {         return true;     } });

which linked surfaceview

msurfaceview.setontouchlistener(new view.ontouchlistener() {     @override     public boolean ontouch(view v, motionevent event) {         return mgesturedetector.ontouchevent(event);     } });

both things happen in oncreate(), every time tap surface view (the "main" view in activity),

private void onsingletap(motionevent e) {     // queue tap if there space. tap lost if queue full.     mqueuedsingletaps.offer(e); }

is called , tap stored. queue processed in every frame drawing (which in turn issued system's ui drawing cycle) here

motionevent tap = mqueuedsingletaps.poll(); if (tap != null && frame.gettrackingstate() == trackingstate.tracking) {     (hitresult hit : frame.hittest(tap)) {        ...

this adds new anchor (i.e. point "locked" in physical world") @ android object rendered (cf. line).


Comments

Post a Comment

Popular posts from this blog

angular - Ionic slides - dynamically add slides before and after -

hi i'm using ngfor create set of 3 slides while starting in middle i'm guaranteed able slide left or right on start. when slide right can simple listen reachedend , push slide array i'm looping. but have problem adding slide beginning. if same above , use e.g. array.unshift() or spread add item beginning, view think it's on position 0 , snaps view new slide. the code below work animates slide change index 1. slide = [0,1,2] //example loop slidechanged(event) { if(this.slides.isbeginning()){ this.slide = [this.slide[0]-1, ...this.slide]; this.slides.update(); this.slides.slideto(1) } } <ion-slides [initialslide]="1" (ionslidedidchange)="slidechanged($event)"> <ion-slide *ngfor="let item of slide"> <h1>slide {{item}}</h1> </ion-slide> </ion-slides> any appreciated! you can using ionslidenextend , ionslideprevend events slides . please
Read more

minify - Minimizing css files -

i want know how css files can minimized. currently, using external sites css minifier compress css files. however, after removing whitespaces, comments, etc, file sizes reduced 10-15%. how frameworks bootstrap manage make minimized versions kilobytes. as example, css is: body { background-color: #ff0; } the reduction goes 28 bytes 22 bytes other css files have lot more characters still smaller this. actually minifying code means it's remove thing code white space characters new line characters comments block delimiters it reduces amount of code has transferred on web , speed site load fastly.but unreadable format.
Read more

Add a dynamic header in angular 2 http provider -

i have http interceptor built via tutorial https://scotch.io/@kashyapmukkamala/using-http-interceptor-with-angular2 the problem need have dynamic header changes automatically once changes 'mode' in app. service able tell interceptor change header, or have interceptor pull header (which string)from service each request. able throwing away patch method, call http.patch('new header string') set header string. call in service controls 'mode' setting. wondering if there way interceptor pull recent value service each request or if can add method http provider via interceptor? i've tried call service in interceptor each request returns undefined. because creating new instance of service or copying value before service fired , loaded/changed data. i don't want pass header string every http provider call because defeats purpose of having interceptor, id able set once changes or have provider fetch service before makes request. tl;dr : need add autom
Read more