I want my ninja to follow another ninja as it moves. My method works except that it is facing its back towards the moving object rather than its from. Can anyone help me
Ogre::Vector3 theOffset(30, 0, 0);
mSceneMgr->getSceneNode("NinjaNode1")->setAutoTracking(
true, mSceneMgr->getSceneNode("NinjaNode2"),Ogre::Vector3::UNIT_Z,theOffset);
I think i need to use offset but i'm really not used to setting positions using vector3... Can anyone flip my character around so that the front faces the moving object... thanks
Try changing the 3rd parameter of setAutoTracking from UNIT_Z to NEGATIVE_UNIT_Z.
Related
I am having trouble filling a mask using cv2.drawContours, I dont know what could it be, or how to fix it.
I have a list with three elements's sublists [coordX,coordY, contour], so for every pair of coordinates, there is an if/else decision, each one with this stament: cv2.drawContours(mask,[l1[0][2]],0,c1[cla],-1)
[l1[0][2]]: contour, like array([[[437, 497]],[[436, 498]],[[439, 498]], [[438, 497]]])
c1[cla]: tuple, like (25,250,138)
The script runs well without errors, but the resulting image is almost black, just having 4 green pixels.
Any suggestion or advice?
Finally, I found what was the problem. I was passing the same contour to every step ([l1[0][2]]), so I need to change to operate with index, like [l1[i][2]]).
Sorry for that mistake and for your patience.
Have a good day, Jaime
I'm learning how to render objects with libGdx. I have one square model, that creates a few model instance from them. If I have only one model it renders fine.
But if I have more instances it doesn't properly. Looks like the front objects are draw first, and the background the last one, so always the background objects are visible and the front objects you can see through them.
To render I use the following
Gdx.gl.glViewport(0,0,Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
Gdx.gl20.glClearColor(1f, 1f, 1f, 1f);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT | GL20.GL_DEPTH_BUFFER_BIT);
mb.begin(cam);
worldManager.render(mb, environment);
mb.end();
mb variable is the ModelBatch instance, and inside worldManager.render each model instance is draw as follow:
mb.render(model, environment);
I'm not sure what is happening. But I think it is some GL attribute that I need enable
Is not 100% related to the following post because, yes it uses OPENGL like libgdx, but the solution provided in that post is not working and I think the problem comes from ModelBatch from libgdx
Reproduction of the problem
You didn't setup your camera correctly. First of all your camera's near plane is 0f, which means it is infinitely small. Set it to a value of at least 1f. Secondly you set the camera to look at it's own position, which is impossible (you can't look inside your own eyes, can you ;)).
So it would look something like:
camera = new PerspectiveCamera(90, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
camera.position.set(0, 10, 0);
camera.lookAt(0,0,0);
camera.near = 1f;
camera.far = 100f;
camera.update();
You probably want to start here: https://xoppa.github.io/blog/basic-3d-using-libgdx/
For more information on how the camera works have a look at: http://www.badlogicgames.com/wordpress/?p=1550
Btw, calling Gdx.gl20.glEnable(GL20.GL_DEPTH_TEST); will not help at that location and should definitely not be done when mixed with ModelBatch. ModelBatch manages its own render context, see the documentation for more information: https://github.com/libgdx/libgdx/wiki/ModelBatch
There are a lot of possible answer, but I would say that
glEnable (GL_DEPTH_TEST) ;
could help if you haven't done it yet. Also, enabling depth buffer only works if you actually have a depth buffer, which means you must makes sure you have one, and the method for this depends on your window context.
for show the difference dimentions you can use the fog
Im using cocos2d version 3 in Xcode.
I want to move a sprite to a number of touch locations, in the order they were touched. It'll be a different number each time.
With TouchBegan I've added sprites that look like targets at the touch locations, and saved them as objects in an array. I've initialized the array and it's working fine.
I need to move a sprite to the first objects location, then the second, third etc. I'm nearly there but can't find a way to 'cycle through' the array to get the locations. I can only get the first location by setting up a CCNode as objectAtIndex:0 and using the nodePosition.
This is asking a lot, but I've googled for days and I can't find anything! Been on this for days!
Following the example on: http://www.raywenderlich.com/61391/how-to-make-a-simple-iphone-game-with-cocos2d-3-0-tutorial
You can use the following code to go to each point:
// 4
CCActionMoveTo *actionMove = [CCActionMoveTo actionWithDuration:1.5f position:targetPosition];
CCActionRemove *actionRemove = [CCActionRemove action];
[theSprite runAction:[CCActionSequence actionWithArray:#[actionMove,actionRemove]]];
And when you reach the target point just add the following target
Sorry I'm a bit new with SDL and C++ development. Right now I've created a tile mapper that reads from my map.txt file. So far it works, but I want to add editing the map now.
SDL_Texture *texture;
texture= IMG_LoadTexture(G_Renderer,"assets/tile_1.png");
SDL_RenderCopy(G_Renderer, texture, NULL, &destination);
SDL_RenderPresent(G_Renderer);
The above is the basic way I'm showing my tiles, but if I want to go in and change the texture in real time it's kind of buggy and doesn't work well. Is there a method that is best for editing a texture? Thanks for the help I appreciate everything.
The most basic way is to set up a storage container with some textures which you will use repeatedly; for example a vector or dictionary/map. Using the map approach for example you could do something like:
// remember to #include <map>
map<string, SDL_Texture> myTextures;
// assign using array-like notation:
myTextures["texture1"] = IMG_LoadTexture(G_Renderer,"assets/tile_1.png");
myTextures["texture2"] = IMG_LoadTexture(G_Renderer,"assets/tile_2.png");
myTextures["texture3"] = IMG_LoadTexture(G_Renderer,"assets/tile_3.png");
myTextures["texture4"] = IMG_LoadTexture(G_Renderer,"assets/tile_4.png");
then to utilise a different texture, all you have to do is use something along the lines of:
SDL_RenderCopy(G_Renderer, myTextures["texture1"], NULL, &destination);
SDL_RenderPresent(G_Renderer);
which can be further controlled by changing the first line to
SDL_RenderCopy(G_Renderer, myTextures[textureName], NULL, &destination);
where textureName is a string variable which you can alter in code in realtime.
This approach means you can load all the textures you will need before-hand and simply utilise them as needed later, meaning there's no loading from file system whilst rendering:)
There is a nice explanation of map here.
Hopefully this gives you a nudge in the right direction. Let me know if you need more info:)
I have a CCSprite which gradually needs to be exhausted linearly from one end, lets say from left to right.For this purpose ,I am trying to change the textureRect property of the sprite so that the part that got exhausted from one end is 'outside' the displaying frame of the sprite.
I did this sort of thing before with a sprite that gets loaded from a spritesheet.And it worked perfectly.But I created this CCSprite using CCRenderTexture and by changing the textureRect property,the entire sprite gets disappeared.
The first image is the original CCSprite which I get from CCRenderTexture.The second image shows what I want to achieve.The black dotted rectangular portion of the Sprite needs to be omitted out.Only the blue dotted portion of the sprite needs to be displayed.Essentially,this blue dotted rectangle is my textureRect.
Is there any way how I could make my sprite reduce from one end.
Also is there any difference between a sprite created normally,and one created using CCRenderTexture.
I have done similar thing like this before using some low-level hack.
There is a work around solution if you use CCProgressTimer, that's very easy and I think it should be enough for your examples.
But you said in comment that you have some special requirements like "exhaust it from both the ends at once" then some low-level hack is needed. My solution from my last object is:
1) Get the texture image's raw data. In cocos2d you can use CCRenderTexture and in cocos2d-x you can use CCImage.
2) CCRenderTexture has a method of - (BOOL) saveToFile: (NSString *) name
format: (tCCImageFormat) format
. You can read its source code then try to save it into an 2D array instead like byte raw[1024][768]. Each element in this array represents one pixel on your picture(the type may not be byte, I'm not sure, nearly forget the details). The format MUST BE PNG since transparency will be needed.
3) Modify raw data directly, set pixel's transparency to 0x0 which you want it to disappear.
4) Re-initialize a CCRenderTexture using picture data you modified.
I can't provide the code directly since is a trade secret and core part of one of my projects. But I can share you my solution. You also need some knowledge about how PNG file works. Read:
https://en.wikipedia.org/wiki/Portable_Network_Graphics#File_header
Turns out I was making a silly mistake.While supplying values to the textureRect(CGRect),I was actually setting the textureRect.origin.y to the height of the texture which made my textureRect go beyond(above) the texture area.This explains why they were disappearing.