ios - Updating geometry in SpriteKit (or SceneKit) -

-

we porting game spritekit , i've run in bit of problem. objects in our game have triangle-strip trails attached them. vertex buffers of trails continuously updated objects move in world create seamless , flowing effect (there constraints on how many vertices in buffer , how emit new vertices).

in previous implementation updated affected vertices in corresponding buffer whenever emitted new vertices. in scenekit seems unable update geometry sources, unless use geometrysourcewithbuffer:vertexformat:semantic:vertexcount:dataoffset:datastride:. however, seems need metal device, command queue , encoder, able submit commands update buffer before renders.

is there way can normal scnview, or have manually cametallayer, creating own metal device etc?

in essence, everything need, bar trail geometry available in spritekit, hoping there way hold of metal device , command queue used skview , use upload geometry. make things a lot simpler.

i've used particle system similar effect. particle emitter attached moving object, particles set fade out , die. might need set emitter's targetnode scene, depending on effect want.

    emitter = skemitternode()     emitter.name = marblenodenames.trail.rawvalue     emitter.particletexture = sktexture(imagenamed: "spark")     emitter.particlealphaspeed = -1.0     emitter.particlelifetime = 2     emitter.particlescale = 0.2     marblesprite.addchild(emitter)

Comments

Post a Comment

Popular posts from this blog

ruby - Trying to change last to "x"s to 23 -

-
i have been playing around irb , have string looks this: irb(main):072:0> puts ["[\"4354 5432 5432 xxxxx\", \"6547 6547 8543 xxxxx\", \"2344 6543 6674 xxxxx\", \"2346 6236 7543 xxxxx\", \"1273 5585 5587 xxxxx\"]"] => nil irb(main):073:0> what want gsub last 2 "x" s of each 17 digit combination, 23 . what i've tried far (i've been using rubular): a.gsub(/\d[x]/,"23") <= grabs "x" s i'm close a.gsub(/\w[x{2}]/,"23") <= grabs "x" s grabs two digits each combination. is there easier way i'm not understanding? a.gsub(/\d{4} \d{4} \d{4} xxx\kxx/, '23') \d{4} = 4 digits what \k drop matched far. can use don't replace entire number, still able validate have in desired format.
Read more

jquery - Clone last and append item to closest class -

-
this bare-bones code on page: <div class="list-container"> <div class="single-list-item"> <button>remove</button> </div> <div class="single-list-item"> <button>remove</button> </div> <div class="single-list-item"> <button>remove</button> </div> </div> <p><button class="add-list-item">add</button></p> <div class="list-container"> <div class="single-list-item"> <button>remove</button> </div> <div class="single-list-item"> <button>remove</button> </div> <div class="single-list-item"> <button>remove</button> </div> </div> <p><button class="add-list-item">add</button></p> <di...
Read more

css - Can I use the :after pseudo-element on an input field? -

-
i trying use :after css pseudo-element on input field, not work. if use span , works ok. <style type="text/css"> .mystyle:after {content:url(smiley.gif);} .mystyle {color:red;} </style> this works (puts smiley after "buu!" , before "some more") <span class="mystyle">buuu!</span>a more this not work - colors somevalue in red, there no smiley. <input class="mystyle" type="text" value="somevalue"> what doing wrong? should use pseudo-selector? note: cannot add span around input , because being generated third-party control. :after , :before not supported in internet explorer 7 , under, on elements. it's not meant used on replaced elements such form elements (inputs) , image elements . in other words it's impossible pure css. however if using jquery can use $(".mystyle").after("add smiley here"); api docs on .after to ...
Read more