I try to create simple particle system containing 2 emitters(controllers) : 1 for fire and 1 for smoke. i'm doing it problematically and not using editor. I started with fire and create BilboardParticleBatch set texture and the result was not good at all. The reason is that inside batch the blending function is not correct. So I override it in my own batch and change it to GL_SRC_ALPHA, GL_ONE - this produce better results.
So now using my batch the fire is looking good. Then I want to add smoke, so here I want to use Not pre-multiplied blending, so again I created new batch extending BillboardparticleBath and make it to use SRC_ALPHA, ONE_MINUS_SRC_ALPHA and assign it smoke texture. So the smoke is perfect.
The main problem is how to merge both controllers. If I put them both to ParticleEffect and put this Effect in ParticleSystem then I'm able to render them together but the problem is that when particle from both emitters overlaps, sometimes they have wrong blending. It is because probably they are not sorted together as they use 2 batches. The sort is applied not by effect level but by batch level. So this is not a sollution :(
I can try using only one batch and use TextureRegion influencer in order to use different textures for smoke and fire inside 1 batch, but how to solve problem with different blending as it will be one and the same for the batch.
Is it a way somehow to merge both batches in one and tell it to render fire using additive and smoke using just alpha.
Thanks in advance!
Problem is solved. Now it is working fine with 2 batches. I just add depth testing function to the material when override the particle batch.
Related
So I'm trying to make cutscenes in JSON.
And I want to make the sprite fadeout, but only when it should.
Is there a way I can add things to Batches without putting tons of IF Statements between them, because I want to do more with Sprites from JSON.
Anybody know a method?
You're looking for Actions – a way to apply some actions one after another. See the docs.
Unfortunately, they only apply to Actors, but you may indeed use Image:
Image image = new Image(...)
image.addAction(
Actions.sequence(
Actions.delay(0.5),
Actions.moveBy(..., ...),
Actiond.alpha(0)
)
)
There's pretty much an action for everything. So, the idea is:
Read a json for some actions
Create Actions.sequence and put all them into it.
Attach the sequence to the Image.
I got some strange issues with transparency and 3d particles. A short vid to illustrate:
https://youtu.be/ZHKI1X3MjhY
As you can see I have a 3d particle effect, fire burning. Inside it is a 3 model with no alpha blending and it shows just fine. then in the far distance there is a small skeleton (with blending and alphatest turned on) and it also shows just fine through the fire. Then I turn camera and look at the warrior skeleton and it just disappear and instead you see what is behind him. I turn camera again and the mage skeleton also vanishes, but you can see the trees a bit further away just fine and they have the exact same settings for blending and alpha test. If I move the character say 20 yards away it also starts showing through the fire effect.
So it seems to have something to do with distance from the 3d particle effect...
The 3d particle batch is an extended BillboardParticleBatch like this:
protected Renderable allocRenderable(){
BlendingAttribute ba=new BlendingAttribute(GL20.GL_SRC_ALPHA, GL20.GL_ONE,1f);
Renderable r = super.allocRenderable();
r.material = new Material( ba,
// new DepthTestAttribute(GL20.GL_LEQUAL, 0.0f, 0.5f, true),
// r.material.set(new FloatAttribute(FloatAttribute.AlphaTest, 0.0f),
TextureAttribute.createDiffuse(texture));
return r;
}
All the characters and the trees are created with following attributes:
if (alpha) {
FloatAttribute floatAttribute = new FloatAttribute(FloatAttribute.AlphaTest, 0.5f);
BlendingAttribute blendingAttribute = new BlendingAttribute(GL20.GL_SRC_ALPHA, GL20.GL_ONE_MINUS_SRC_ALPHA, 1f);
for (int i = 0; i < bulletEntity.modelInstance.materials.size; i++){
bulletEntity.modelInstance.materials.get(i).set(blendingAttribute);
bulletEntity.modelInstance.materials.get(i).set(floatAttribute);
}
}
The models are drawn first then the particles, I tried changing order but no difference. I have tried a lot of different setups for alphatest, depthtest and blendingattribute but can not find anything that works.
EDIT
I removed the Blending attribute from the 3d-models and now it looks as it should regarding the particle effect. However I need most materials on my character models to have blending set..
Anyone got any clue why this is happening when I enable blending?
I also tried to use the BillboardParticleBatch without extending it in case I had done something there but the effect then is even worse. All models with blending enabled appear in-front of the particle effect even though they stand behind it.
ModelBatch sorts your render calls (check this link, really, it is a must read), to avoid incorrect behavior (as you're experiencing). The actual sorting/rendering happens at the call to ModelBatch#end. By default it uses the DefaultRenderableSorter, which is a default implementation. Of course, because that implementation isn't aware of your scene, it might not fit exactly your needs.
The DefaultRenderableSorter tries to guess the location of each model based on their transformation matrix. Based on that location and the camera's location it will sort them so that:
First all opaque objects are rendered from front to back (because whatever is behind an opaque object isn't visible anyway, so that reduces unneeded calls to the fragment shader).
Secondly all transparent objects are rendered from back to front (because as soon as a transparent object is rendered then everything that is rendered after that and is behind it, will not be visible).
To decide whether an object is transparent, the BlendingAttribute#blended member is used. (So you could, if you really wanted to, set that member to false to force it to be treated (sorted) as if it was opaque)
So, the order in which you call ModelBatch#render is not necessarily the order in which they are actually executed. If you want to force to render whatever you've added to the batch in between, then call the ModelBatch#flush(). Of course, doing this a lot defeats some of the purpose of ModelBatch in the first place.
Instead you could implement your own RenderableSorter which has more knowledge about your scene and can therefor do a better job sorting than the default implementation. (however if flush() works for you and there's no other issue, then just flush might be the easiest solution for you).
That said, there a various other solutions you could try as well. E.g. the regions of the particles are fully transparent, so the fragment shader might as well discard those all together. Try adding FloatAttribute.AlphaTest with a value of 0.5f to the particles. If that messes with your blending then gradually reduce the value to e.g. 0.05f.
Also, you could add a DepthTestAttribute with depthMask set to false (new DepthTestAttribute(false)). This will prevent the particles from writing to the depth buffer. (but also might cause other things to show in front of the particles).
I really want to know, is it possible to create a fixture for a body that could be broken by some other body?
There is the example:
a body with its fixture divided into small figures:
and what happens after it is hit by another body:
P.s. Are there any programs that could help the process of creating such fixture?
yes you can do this using Breakable spotted at :
net.dermetfan.gdx.physics.box2d.Breakable
The Breakable allows to easily make whole bodies or single fixtures breakable, which means they will be destroyed if a certain force or friction is applied to them.
How to use
A Breakable is meant to be put in a body's, fixture's or joint's user
data. A single Breakable instance can be put in the user data of
multiple bodies, fixtures and joints. Since this may collide with the
Box2DSprite or other classes using the user data, the
Breakable$Manager uses a Function to access the Breakable in the
user data of a body, fixture or joint.Do not forget to set a Manager
instance as ContactListener to the world and to call destroy() after
every timestep. If the field is already in use, check out the
ContactMultiplexer. The Manager does the actual work, the Breakables
are just passive data holders.
A Breakable consists of a normal resistance, tangent resistance, an
option to destroy its body in case its last fixture was destroyed and
an option setting if the body should be destroyed no matter the amount
of remaining fixtures.
The normalResistance is the force that can be applied to the
Breakable before it breaks (inclusive). The tangentResistance is the
friction the Breakable can bear (also inclusive). The
reactionForceRestiance specifies the reaction force a joint can bear
on each axis. The reactionForceLength2Resistance is the max squared
length of the joint's reaction force the Breakable can bear.
referred to libgdx-utils
some other good references with good examples here and here
for the question (Are there any programs that could help the process
of creating such fixture)
yes you can easily use box2d-editor which allows you to create complex polygons and you can also create your bodies and shapes from your images or sprites check the official documentation in the same page there are several video who explain the way box2d-editor works :
Features:
Automatically decomposes concave shapes into convex polygons,
Automatically traces your images if needed,
Supports multiple outlines for a single body,
Supports polygon and circle shapes,
Reference point location can be changed,
Visual configurable grid with snap-to-grid option,
Built-in collision tester! Throw balls at your body to test it,
Loader provided for LibGDX game framework (written in Java),
Simple export format (JSON), to let you easily create your own loader for any framework in any language.
I'm using physInjector and therefore cannot move clips containing my objects: The physical engine works incorrectly because of it.
I think about implementing something like a bitmap drawing a selected part of the stage on itself. How can it be done? I've read this Trying to capture stage area using BitmapData, but there the author copies its data from the stage, whereas I need the area outside it.
Besides, aren't there less resource-consuming solutions?
First, you may want to use a global Sprite to put your clips insde, like :
var a:Sprite = new Sprite();
a.addChild(myClip1);
a.addChild(myClip2);
...
Then, you should be able to move a.
If you don't, and your physic engine rely on Stage to work, you should probably try to fix it, or to understand better how it work so you can move your movieclips.
Redraw a BitmapData every frame will require a lot of CPU ressource, and you won't be able to interact with your clips. That's really not the best way to go.
x=-(player.mc.x-stage.stageWidth/2);
y=-(player.mc.y-stage.stageHeight/2);
if(canvas)
removeChild(canvas);
var bd:BitmapData=new BitmapData(stage.stageWidth,stage.stageHeight,false,0xFFFFFF);
bd.draw(stage);
trace(bd);
canvas=new Bitmap(bd);
addChild(canvas);
x=0;
y=0;
At PC it works fine. Don't know whether it is suitable for mobiles.
I also haven't tested the approach suggested by blue112 because in twitter of physinjector developer there are complaints about ANY moving of parent clip (https://twitter.com/reyco1/status/327107695670853632) and it is quite difficult to combine with my existing architecture.
Changing the globalOffsetX and globalOffsetY properties also didn't help
I am developing a component that can list files that users select from their filesystem. I'm using a (extended) FileReferenceList and (my own) FileReferenceDisplayList. The latter listens for events from the former.
If the FileReferenceDisplayList receives a FileReferenceListEvent.ADDED event, it should display the new item in the displaylist. However, when multiple files are added at once I want to animate them sequentially in stead of at the same time. What would be the best strategy for making sure the items are animated with small pauses between them?
I thought about putting newly added items in a queue and then polling the queue for existing items with an Event.ENTER_FRAME. But maybe you can suggest another method that doesn't need to make use of Event.ENTER_FRAME?
Edit
I guess I forgot to mention that the part that puzzles me the most how I can set some timeout if multiple files are added. Maybe I should use the queue's length to multiply the timeouts for the items? So, if a file is added, I set the animation timeout for that item to be multiplied by the current length of the queue? (Just thinking out loud here).
take a look at TimeLineLite from Greensock - http://blog.greensock.com/timelinelite/
insertMultiple() and appendMultiple()
provide some very powerful sequencing
tools, allowing you to add an Array of
tweens or timelines and optionally
align them with SEQUENCE or START
modes, and even stagger them if you
want.
You can use a Timer but why not stick with the ENTER_FRAME.