cocos3d dynamically create 3D box - cocos3d

Question

I am new in cocos3d but i know cocos2d. i want to create 3d box dynamically. so what i did inside cc3layer is
-(void) initializeControls {
[self schedule:#selector(create_box:) interval:2 ];
}
-(void)create_box:(id)sender{
[self unschedule:#selector(mov_cel:)];
[[testWorld sharedcontescWorld] world_create_box];
}
and in cc3world class is
static testWorld *_sharedcontescWorld=nil;
+(testWorld *)sharedcontescWorld{
#synchronized([testWorld class]){
if (!_sharedcontescWorld)
[self alloc];
return _sharedcontescWorld;
}return nil;
}
+(id)alloc{
#synchronized([testWorld class]) {
_sharedcontescWorld = [super alloc];
return _sharedcontescWorld;
}return nil;
}
-(void) world_create_box{
int minx=-50;
int maxx=50;
float posx=(float)(minx+arc4random()%maxx);
CC3MeshNode* aNode;
aNode = [CC3BoxNode nodeWithName: #"Simple box"];
CC3BoundingBox bBox;
bBox.minimum = cc3v(-10.0, -10.0, -10.0);
bBox.maximum = cc3v( 10.0, 10.0, 10.0);
[aNode populateAsSolidBox: bBox];
[aNode setLocation:cc3v(posx,0,0)];
aNode.material = [CC3Material material];
[self addChild:aNode];
id move3d=[CC3MoveTo actionWithDuration:1 moveTo:cc3v(posx,0,100)];
id remove=[CCCallFuncND actionWithTarget:self selector:#selector(removeObj:)];
[aNode runAction:[CCSequence actions:move3d,remove,nil]];
}
but it doesn't work......can anyone help me?

Answer 1

Do you have a camera and light set up as well?
Without camera info it's a hard to tell, but I think you might either not be looking at the cube (camera missing or aimed wrong), or the cube is too big and you're inside it.
Try it with a camera and light, and some more modest sizes.
Here's some example code that worked for me in the cocos3d XCode project template:
// Create the camera, place it back a bit, and add it to the world
CC3Camera* cam = [CC3Camera nodeWithName: #"Camera"];
cam.location = cc3v( 0.0, 0.0, 10.0 );
[self addChild: cam];
// Create a light, place it back and to the left at a specific
// position (not just directional lighting), and add it to the world
CC3Light* lamp = [CC3Light nodeWithName: #"Lamp"];
lamp.location = cc3v( -2.0, 0.0, 0.0 );
lamp.isDirectionalOnly = NO;
[cam addChild: lamp];
float maxx=5.0;
float posx=CCRANDOM_MINUS1_1()*maxx;
CC3BoxNode* aNode;
aNode = [CC3BoxNode nodeWithName: #"Simple box"];
CC3BoundingBox bBox;
bBox.minimum = cc3v(-1.0, -1.0, -1.0);
bBox.maximum = cc3v( 1.0, 1.0, 1.0);
[aNode populateAsSolidBox: bBox];
[aNode setLocation:cc3v(posx,0.0f,-5.0f)];
aNode.material = [CC3Material material];
[self addChild:aNode];
id move3d=[CC3MoveTo actionWithDuration:1.0f moveTo:cc3v(posx*-1.0,0.0f,-5.0f)];
// id remove=[CCCallFuncND actionWithTarget:self selector:#selector(removeChild:)];
[aNode runAction:[CCSequence actions:move3d,/*remove,*/nil]];
Notes:
cocos3d readme has instructions to install the XCode project templates, if you haven't yet.
I replaced all the "Hello World" object code in the template with this stuff (note it's the same camera and light code/comments); you can leave it but you'll have some words in front of your box.
Changed CC3MeshNode to CC3BoxNode for clarity, but totally CC3MeshNode works too.
Replaced arc4random() with the cocos2d helper function
CCRANDOM_MINUS1_1() just for ease of reading (and to share this
cocos2d gem).
Commented out the CCFuncCallND because I didn't have a removeObj function. Hope you do. ;)
Hope that helps.

Answer 2

I have not started with cocos3d but I have found this code on stackoverflow that works
CC3BoundingBox bounds = makeBounds(9.5, 5.0, 4.0, 0, 0, 0);
CC3MeshNode *cube = [[CC3MeshNode alloc] init];
[cube populateAsSolidBox:bounds];

Answer 3

There is a CC3BoxNode class to help you do that. Eg:
CC3BoxNode *box = [CC3BoxNode nodeWithName:#"MyBox"];
[box populateAsSolidBox:CC3BoxMake(-1, -1, -1, 1, 1, 1)];
[self addChild:box];
This would create a 2x2x2 box with its origin point in its absolute center.
Hope that helps.