particle-system

问题 I draw fire on my android device with libgdx: ParticleEffect effect; ParticleEffectPool fireEffectPool; Array<PooledEffect> effects = new Array<PooledEffect>(); @Override public void create() { ... effect = new ParticleEffect(); effect.load(Gdx.files.internal("particles/fire01.p"), Gdx.files.internal("image")); effect.setFlip(true, false); fireEffectPool = new ParticleEffectPool(effect, 1000, 3000); PooledEffect myEffect = fireEffectPool.obtain(); myEffect.setPosition(200, 400); effects.add

问题 I've been using 24bit .png with Alpha, from Photoshop, and just tried a .psd which worked fine with OpenGL ES, but Metal didn't see the Alpha channel. What's the absolutely most performant texture format for particles within SceneKit? Here's a sheet to test on, if needs be. It looks white... right click and save as in the blank space. It's an alpha heavy set of rings. You can probably barely make them out if you squint at the screen: exaggerated example use case: https://www.dropbox.com/s

问题 In my application I'm having troubles with the z-buffer. I have a ParticleSystem in which the dots have a texture to look like spheres. But there are two problems which I can't solve at the same time.... Either the spheres were sorted right in z-buffer but aren't transparent or they are transparent but not right sorted! Please have a look at my JSfiddle. (based on this example from mrdoob) In the original example all looks well. But as you can see in my fiddle, the texture is not transparent,

问题 Hi can anyone help me whith this? I have this shader, it works with THREE.Mesh but doesn't with THREE.Particlesystem? I want each particle to have a portion of a given map(texture) and change their positions accordingly, something like this http://www.chromeexperiments.com/detail/webcam-displacement/?f=webgl <script id="vs" type="x-shader/x-vertex"> uniform sampler2D map; varying vec2 vUv; void main() { vUv = uv; vec4 color = texture2D( map, vUv ); float value = ( color.r + color.g + color.b

问题 I am developing a game for iPhone using OpenGL ES 1.1. In this game, I have blood particles which emit from characters when they are shot, so there can be 1000+ blood particles on the screen at any one time. The problem is that when I have over 500 particles to render, the game's frame rate drops immensely. Currently, each particle renders itself using glDrawArrays(..) , and I know this is the cause for the slow down. All particles share the same texture atlas. So what is the best option to

问题 I have a particle system where all the particles are positioned at the same coordinates and one after another, in random directions, they (should) start orbiting the center of the scene forming a sphere. What I managed to achieve until now is a group of Vector3 objects (the particles) that one after another start orbiting the center along the Z axis simply calculating their sine and cosine based on the current angle. I'm not that good at math and I don't even know what to look for precisely.

问题 How can I properly play the particle system component, which is attached to a GameObject? I also attached the following script to my GameObject but the Particle System does not play. How do I fix this? public Transform gameobject1; public Transform gameobject2; public ParticleSystem particules; void Start() { float distance = Vector3.Distance(gameobject1.position, gameobject2.position); } void Update() { if(distance == 20) { particules.Play(); } } 回答1: I don't see you declaring distance in

问题 what I'm trying to achieve is having a particle system where each particle have a portion of a given texture. Below is a example of a particles's buffergeometry using a shader material. so far I can make it look almost as it should, nonetheless, I dont know how to properly program the fragment shader in order to have the correct offset of the texture on each particle. the texture is 500x500px which is the same amount of particles. http://www.pruebasmemo.co.nf/ fragment shader code: uniform

问题 I have lots of same simple objects that are affecting gameplay, thousands of them! Well, not thousands, but really many. So if I make them GameObjects, the FPS decreases, especially when spawning them. Even with pooling. I should try a different approach. You know that particle system in Unity3D can render many particles very fast. It also automatically controls particles, emits and removes them. But in my case, positions and lifetimes of objects are managed by game logic, and particle system

问题 I've been trying to write a kernel in that calculates the sum of the inverse of the distance between N given points over N. A serial coda in C would be like average = 0; for(int i = 0; i < Np; i++){ for(int j = i + 1; j < Np; j++){ average += 1.0e0f/sqrtf((rx[i]-rx[j])*(rx[i]-rx[j]) + (ry[i]-ry[j])*(ry[i]-ry[j])); } } average = average/(float)N; Where rx and ry are the x and y coordinates, respectively. I generate the points via a kernel that uses random number generator. For the kernel, I