I am new to famo.us. I am looking to build a simple 3d animation where a object(box) keeps rotating with its color and opacity changing. Can someone suggest me some ideas on how to proceed ? I tried to use physics engine but with no success.
Take a look at these resources on physics and property transitions:
Happy Boxes - Physics engine demo
Transition Button – PropertyTransitionable
Unofficial list of famo.us resources
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I would like to make a multi touch control for my camera
This camera should do:
zoom in/out when pinching
orbit when swiping
pan when swiping with 2 fingers.
Is there somebody who know some good examples/tutorials or give me some advice?
Thank you so much
The best example I found was the Strategy Game (Tower defense) sample that comes with the Unreal Engine. It demonstrates an independent camera system in C++ that responds to touch gestures.
As a simplified but very similar approach you may find also find useful my UE4TopDownCamera sample project for a top down camera with:
spread/pinch or mouse wheel up/down for zoom in/out (implemented as dollying)
swipe with one finger for panning
on/off functionality to lock on/follow main character or freely move
camera.
Please notice that the gestures are not exactly the ones you described, as my requirements were different.
I'll soon upload some full explanation and a video on github.
I have seen some similar questions asked but no definitive answer.
I have a background image that I'm using for my main menu for a cocos2d game. I plan to have it animated but not sure what is the most efficient way to do this. One idea was to have multiple images to create the animation but I was thinking this may take up too much memory as each image would be quite big.
The other idea was having one background image as a sprite and then having child sprites of that image that are animated with ccaction. The only thing is I may not be able to create such an elaborate animation if I do this.
I just wanted to get some feedback on this to see what would be the best approach.
Thank you,
Making a frame-by-frame animation of the whole screen would make your app size litteraly explode.
You should definitely go with your 2nd idea, i.e have different sprites for each animated component and use actions to animate them.
Check out CocosBuilder: it provides a nice UI for designing such complex animations
I am trying to develop an 2D game using cocos2d library. I am still learning the framework.
Please understand that I am new to game development but not new to programming using objective c.
Here is the issue I am facing when it comes to my game development effort - I feel that I am missing the theoretical understanding of how to develop an infinite scrolling game. Is it possible for any of you to provide me some guidance on that ?
Here is my understanding of achieving infinite scrolling using cocos2d framework:
Cocos2d has a singleton director class which handles the current scene and scene transitions
In the current scene, I feel like I have to create an platform object consisting of several images and add them as a child to the current layer. And constantly run a move action to the platform sprite. So as and when I detect a particular image is off screen I have to replace it with another image. That way I will be able to create an infinite scrolling.
I am sorry if point 2 is not coherent. I just attempted to put my understanding of how to infinite scrolling.
Can you please help me with this ?
Thanks
I dissected how to implement scrolling with cocos2d-iphone in this article. What you probably want is the "fake scrolling" approach where two background images are moved and switch position after one completely left the screen.
You want to do this for the background layer only, not individual sprites. Your world isn't really moving, it's just the background panning that creates the illusion of movement. All sprites etc (player, enemies) movement is still relative to screen coordinates.
You'll find a working implementation in the code for my Learn Cocos2D 2 book in the Shoot'em Up project.
If you don't want to bother implementing this yourself, KoboldTouch supports endless/infinite scrolling for tilemaps. Here the game objects actually move along with the background infinitely (up to the maximum coordinates supported by float which is around +/- 16 million points).
I'm wanting to create a WoW cooldown effect where a player does some action and is not able to do the action again until the sprite is fully shown again. I have a grayed out version of the same sprite and am wanting to slowly reveal the sprite until it is fully available again. So, there will be a slow blend vertically of the gray and colored sprite.
Is there a way to do this with built in functionality with Cocos2d and CCSprite?
I'm using v2 of Cocos2d so I could write a shader which I think would be pretty easy, but before I went this route I wanted to see if there is an easier way.
Take a look to the CCProgressTimer class. If I understand right, it will make what you want
You can use CCFadeIn to animate the colored sprite over the grayed sprite :
[coloredSprite runAction:[CCFadeIn actionWithDuration:1.0f];
I am working on a graphics game project in OpenGL and I want to make a front page of the game containing a image, few buttons and some text. Buttons on click perform different actions e.g. start button for starting the game , Can anyone please suggest me , How can I do it?
How can I do it?
Well, by implementing it. OpenGL is not a game engine, nor a scene graph, nor a UI toolkit. It's merely a drawing API providing you the means to draw nice pictures, and that's it. Anything beyond that is the task of either a 3rd party library/toolkit, or your own code, or a combination of both.
A usual approach to model this behaviour is by introducing application states. Here is a related question.
You could model your StartScreenState by drawing a plane with buttons using an orthogonal projection and not drawing (or not having initialized yet) the rest. When the player clicks on 'start', you can switch to perspective projection and display game contents.
I don't know that I would even use OpenGL for that. OpenGL is for rendering colored/textured triangles/quads so that you can do tons of stuff graphically. There's no such thing as "load an image to coordinate x,y on the screen". The equivalent would be "draw two triangles with these vertices that make up a rectangle and are textured with this image". Which is why I would probably stay away from OpenGL to do this, because you don't really need to use any of the awesome features that OpenGL has.
A very common UI framework that I believe nestles in with OpenGL well if you really want to use the two together is Qt. It should make your life easier in terms of UI stuff. See wiki and dev page.