Has anyone successfully added a 3d Model to a cocos app that would be willing to fill in the community on how you did it? In my case, I'm primarily interested in using 3D models on top of a tilemap.
Thanks
-Sunsu
Has anyone successfully added a 3d Model?
(41 posts) (16 voices)-
I was working on .POD format loader some time ago, but it is unfinished yet.
I believe you can easily use the same loader from oolong engine, or .obj loader from Jeff LaMarche (http://iphonedevelopment.blogspot.com/2009/03/wavefront-obj-loader-open-sourced-to.html). I will complete my own objective-c wrapper over both loader when i'll have some time, but don't expect it soon.Regards,
Alex.Posted 3 years ago # -
Aye, here's a super secret preview screenshot of my upcoming game ;)
As you can see, there are 3 "buildings", simply cubes seen from above with perspective to add the feeling of depth to the game.
If you're familiar with GTA (1 and 2), that's what they did, just much better :)
Is that the effect you're after?Posted 3 years ago # -
Well thanks for the kind words ;)
I'm going for a "crazy taxi" theme if you're familiar with that game.
Except it has micro machines like graphics, with those 3d cubes there.
Basically you drive around the city, pick up clients and drop them off within a time limit to make money.
Arcade-style, the way I like it :)Posted 3 years ago # -
Well thanks again for your support ;)
I could provide some code sunsu if you want, it's pretty basic stuff but it can be quite difficult to get the texture mapping correct, some of it is still a mistery to me as to how it works.
The game will be called "Mini Taxi" and it will be submitted to Apple next week, I really hope it pays off cos I gave up my job to try do this full time, and money's running out :)
Yeah codemattic I saw Taxiball it looks cool, I haven't played it yet though.
Gameplay will be quite different, so I hope people won't steer away from MiniTaxi because they already have Taxiball.
Hope is the last to die, they say...Posted 3 years ago # -
@patrickC, the game looks great but the app store seems to be a random market. I don't think it's a good idea to quit your job, but now it's too late, so you don't have the choice ^_^.
I'm also interested to know how to integrate 3D stuff in cocos2D and would love to see a short example of code. I'm a 3D noob.
Posted 3 years ago # -
Well, it's actually very straightforward.
We want to draw a 6 faced cube, so we need to tell opengl to draw 12 triangles (opengl es can only draw triangles and not quads).
Two triangles will compose one face of the cube.
To optimize the calls to opengl, we'll group all of the vertices into one array, so that with one opengl call we draw all of the cube.
To map a texture, we simply bind a texture that we've pre-loaded, and similarly to the vertices array, we have another array that defines which region of the texture each polygon will display.This is the code to draw a 6 faced texture mapped cube.
-(void)draw { glColor4f(1,1,1,1); glEnable(GL_TEXTURE_2D); glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glBindTexture(GL_TEXTURE_2D, spriteTexture); glVertexPointer(3, GL_FLOAT, 0, cubeVertices); glTexCoordPointer(2, GL_FLOAT, 0, texCoords); glDrawArrays(GL_TRIANGLES, 0, 36); glDisableClientState(GL_VERTEX_ARRAY); glDisableClientState(GL_TEXTURE_COORD_ARRAY); glDisable(GL_TEXTURE_2D); }The "cubeVertices" array:
GLfloat cubeVerticesTemp[] = { posX, posY+depth, height, width+posX, posY+depth, 0.0f, width+posX, posY+depth, height, posX, posY+depth, height, posX, posY+depth, 0.0f, width+posX, posY+depth, 0.0f, posX, depth+posY, height, width+posX, posY, height, width+posX, depth+posY, height, posX, depth+posY, height, posX, posY, height, width+posX, posY, height, posX, posY, height, width+posX, posY, 0.0f, width+posX, posY, height, posX, posY, height, posX, posY, 0.0f, width+posX, posY, 0.0f, posX, posY,0.0f, width+posX, depth+posY, 0.0f, width+posX, posY, 0.0f, posX, posY, 0.0f, posX, depth+posY, 0.0f, width+posX, depth+posY, 0.0f, posX, depth+posY, height, posX, posY, 0.0f, posX, depth+posY, 0.0f, posX, depth+posY, height, posX, posY, height, posX, posY, 0.0f, width+posX, depth+posY, height, width+posX, posY, 0.0f, width+posX, depth+posY, 0.0f, width+posX, depth+posY, height, width+posX, posY, height, width+posX, posY, 0.0f, };and the "texCoords" array:
GLfloat cubeTextureCoords[] = { 0.0f, 0.5f, // bottom-upper-right 1.5f, 1.0f, 1.0f, 0.5f, 0.0f, 0.5f, // bottom-lower-left 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, // front-upper-right 1.0f, 0.5f, 1.0f, 0.0f, 0.0f, 0.0f, // front-lower-left 0.0f, 0.5f, 1.0f, 0.5f, 0.0f, 0.5f, // bottom-upper-right 1.0f, 1.0f, 1.0f, 0.5f, 0.0f, 0.5f, // bottom-lower-left 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f, // back-upper-right 1.0f, 0.5f, 0.0f, 0.5f, 0.0f, 1.0f, // back-lower-left 1.0f, 1.0f, 1.0f, 0.5f, 1.0f, 0.5f, // right-upper-right 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.5f, // right-lower-left 0.0f, 0.5f, 0.0f, 1.0f, 1.0f, 0.5f, // right-upper-right 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.5f, // right-lower-left 0.0f, 0.5f, 0.0f, 1.0fI'm aware of the following problem with this code:
Two of the faces (left and top, I think), are drawn with the normal pointing the wrong way.
This needs to be fixed by changing the order the vertices are drawn in (winding).
Not much of a problem in itself, but if we want to improve performance by enabling backface culling (so that backfaces that are not visible are not rendered), then those two faces are not visible.
If anyone needs further explanation don't hesitate to ask :)Regarding the game, I realize that leaving my job to develop an iPhone game is a very risky, if not stupid, move.
On the other hand, I needed a change anyway and took the opportunity, not trying to make a fortune, but if I manage to survive and pay rent while making games that would be a success :)
Once the game is out, I will post in detail my experience with the development, release and future of what could be.
There will be some voodoo spells too, and possible iPhone sacrifices in a stone circle up north.
Cheers :)
PatrickPosted 3 years ago # -
I respect anyone who took the plunge to do this full time! I've turned down a lot of web work over the last 6 months to try and spend more time on iphone developing, but had to keep a few clients on board to pay the bills.
At the very least, you'll (hopefully) have a release on the App Store, and a s*** hot C.V, so I'd look at it as some form of home schooling, which could help you get a job in future if you need to go that route (hopefully not!).
At least that's what I'm telling myself when I'm up to all hours of the morning working on my dev stuff, rather than working on clients work :-/
Posted 3 years ago # -
Very interesting post. To PatrickC and CodeMattic: brave move, I hope it works out well for you guys! Part of me wants to do the exact same...
I ran into some trouble with a game I'm developing also related to 3D. The game it self is mostly a 2D game but I want to show a 3D background (a streetview in perspective). The streetview is moving scrolling away from the viewer giving the illusion that he character in the middle of the screen is moving towards you. I'm having a very hard time getting this accomplished. I actually have something that sort of works but it is far from perfect and probably not the best way to do it. On top of it, the last step that creates the floor rotates the entire view which you notice when you leave the GameScene back to the MenuScene (now the menu scene is in perspective).
Some parts of the code I have:
//Two building layers like below, this one create the left wall
@implementation BuildingViewLayerLeft@synthesize buildings, buildings2;
- (id) init {
self = [super init];
if (self != nil) {//Load file
buildings = [Sprite spriteWithFile:@"buildings2.png"];//Set the position of the buildings on the layer
[buildings setPosition:ccp(780, 160)];
[self addChild:buildings z:0];//Below creates a Z-Vertex effect like in AtlasSpriteTest. duration is 0 so transformation is immediately
[self runAction:[OrbitCamera actionWithDuration:0 radius: 2 deltaRadius:0 angleZ:82 deltaAngleZ:0 angleX:0 deltaAngleX:0]];[self schedule: @selector(updatePositions) interval: 0.02f];
}
return self;
}The main problem is with the floor view:
- (id) init {
self = [super init];
if (self != nil) {//This is where the issues start. It gives the desired effect but also rotates the character which I can correct with an OrbitCamera
glRotatef(-90.0, 0.0, -1.0, 0.0);road = [Sprite spriteWithFile:@"road.png"];
//Set the position of the layer
[road setPosition:ccp(240, 160)];
[road setScale:2.0f];[self addChild:road z:0];
[self setRotation:1];
[self schedule: @selector(updatePositions) interval: 0.02f];
}
return self;
}Clearly not the right way to do it but it gives me the desire effect. I have played around with the Camera a lot too to get the effect but I was unsuccesful
[self.camera setEyeX: ...]; and
[self.camera setCenterX: ...];Any suggestions how to accomplish this would be very helpful!
Posted 3 years ago # -
Hum, I think I understand what you're trying to achieve.
Personally, I probably would have gone a slightly different path, but the concepts are the same.I would try to do the walls/floor by hand, without relying on cocos2d's camera.
In dirty-pseudo code:
drawLeftWall { //save current matrix glPushMatrix(); //rotate matrix so that we draw correctly glRotate(whatever); //bind texture and draw geometries glBindTexture... glDraw... //restore previous matrix glPopMatrix(); }The same would go for the other wall and the floor.
If you take the code I posted above, get that to work, and then start messing around with the matrix, you should be able to create 3d cubes, rotated the correct way to give depth.In having a look at your code, perhaps you're not familiar with pushing/popping the opengl matrix, you should have a quick look into that.
You mention that the "floor" view rotates everything, and then you counter with an orbit camera, you should either rotate back with glRotate, or even better, just push/pop the matrix.Then again, I'm still a noob when it comes to opengl, so take it for what it is.
Hope that's of some kind of help :)
cheers
PatrickPosted 3 years ago # -
Thanks Patrick,
I actually used glPushMatrix and popMatrix yesterday like this:(id) init {
self = [super init];
if (self != nil) {glPushMatrix();
glRotatef(-90.0, 0.0, -1.0, 0.0);
road = [Sprite spriteWithFile:@"road.png"];
//Set the position of the layer
[road setPosition:ccp(240, 160)];
[road setScale:2.0f];[self addChild:road z:0];
[self setRotation:1];
glPopMatrix();
[self schedule: @selector(updatePositions) interval: 0.02f];
}
return self;
}Problem was that it indeed restored the orientation on all the other objects but unfortunately also on the floor object/layer.
Someone suggested a patch to CocosNode in an earlier post that I will try today. I will let you know how that came out
Posted 3 years ago # -
patrickC, could you take a look at this thread?
http://www.cocos2d-iphone.org/forum/topic/934?replies=3#post-5543Thanks,
SunsuPosted 3 years ago # -
The club of poor indie developers?
I'm lucky my expenses are cut down to a couple hundred euros a month...@ashmira
Can't post any relevant code unfortunately, but the minimap is simply a CCSpriteSheet (used to be an Atlas).
The whole texture represents the whole map (512x512) but I only display a small portion of it through a CCSprite
[sprite setTextureRect:...]and at every tick, based on the position of the car in the real map, I make appropriate calculations and update the rectangle of the CCSprite to display the correct portion.
Good enough? ;)Posted 3 years ago # -
The texture of the map applied to the CCSpriteSheet is not taken ingame.
It's an image that I made with Photoshop by taking a screenshot of Tiled, where I drew the level.It's just an image and I change which small square you see of it, and place it in the topright corner and the end result is a mini-map.
Posted 3 years ago # -
ranReloaded
MemberHi
I'm doing something similar; i.e.: mainly 2D with some very basic 3D objects (cubes, too).
I'm switching lighting, normals, etc. between the layer with 3D objects and the flat layers.The problem is, I'm not able to draw an HUD layer on top of the cubes. No matter what Z I set, it is obscured by the cubes.
I tried this:
/* HUD Layer Code */
- (void) draw
{
glDisable(GL_DEPTH_TEST);
[super draw];
glEnable(GL_DEPTH_TEST);
}
to no effect... How did you achieve it, PatrickC?
Posted 3 years ago # -
Hum, cocos2d has changed a bit in the way it draws, namely the default states so you'll need to play around a bit.
GL_DEPTH_TEST needs to be enabled all the time, at least that's the way I did back then.
There were also some problems with how cocos2d handled setting the depth test, i think it's fixed now but it might be worth looking into it.Also, I can't remember just now but I'll check if needed, I think I ended up cheating and drawing the things in the proper order, while alternating calls to:
glDepthFunc(func) func is the test function : GL_NEVER, GL_ALWAYS, GL_LESS, GL_LEQUAL, GL_EQUAL, GL_GEQUAL, GL_GREATER or GL_NOTEQUAL.This allows you to over-ride the Z values and place something on top, regardless of where it should actually be.
A bit of a cheat, but if done properly can get the job done.Good luck ;)
Posted 3 years ago #
Reply »
You must log in to post.