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Topics - hisong

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1
Support / How to Draw a circle?
« on: February 20, 2012, 07:19:22 am »
Hi,guys.

I want to draw a circle but it seems that none of funtions of Class Primitives supports to make one.

How can I do?   Or can I only make one from a 3DS or a OBJ file?

and another question:  Since I create a Skybox and add texture on it, the skybox work well.but then I want to add a object of Object3D in the Skybox, the object was invisible.


Code: [Select]
                        skyBox = new SkyBox(10);

world = skyBox.getWorld();
world.setAmbientLight(255, 255, 255);

plane = Primitives.getPlane(10, 2);
plane.strip();
plane.build();
world.addObject(plane );

// 获得相机
cam = world.getCamera();
// 设置相机的位置，在中心的位置
cam.setPosition(plane.getTransformedCenter());

cam.lookAt(new SimpleVector(0, 0, -1));

anyone help me?

2
Support / How to use 2048 * 1024 texture on a sphere?
« on: September 21, 2011, 08:50:28 am »
I was trying to use larger than 1024x1024 textures on a sphere I get from a 3ds file.

But an error of "Out of Memory" occurs during the the program is beginning to run.

And if I use the BitmapHelper to rescale the image to 1024*1024,  It works well.


Code: [Select]
Bitmap bitmap = BitmapHelper.rescale(BitmapFactory
.decodeFile("/sdcard/jpct/hd.jpg"), 1024, 1024);
// Bitmap bitmap = BitmapFactory.decodeFile("/sdcard/jpct/hd.jpg");
Texture texture = new Texture(bitmap);
bitmap.recycle();

TextureManager.getInstance().addTexture("texture", texture);
Dose JPCT-AE not support the 2048*1024 or higher??

ps:I can use Opengl ES to load an image of 2048 * 1024 resolution. and of cause it work well and smoothly.

Thanks for help~~

3
Support / object is null while object picking
« on: August 24, 2011, 03:27:52 pm »
Hi, I am again.
I am doing a test about picking with JPCT-AE , so I consulted the threads(http://www.jpct.net/forum2/index.php?topic=1601.0 and http://www.jpct.net/wiki/index.php/Picking) about picking.

I did like the thread discussed, but I always get the null result! I don't know why.

This is the code sample.

I get two objects of Object3D from the 3ds file: cube[0] and cube[1],  I want to pick the cube[1] in the world.
so I set the cube[1] to be picked:

Code: [Select]
try {
cube = Loader.load3DS(
new FileInputStream("/sdcard/jpct/sphere.3ds"), 1);
Loader.clearCache();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

cube[0].setTexture("texture");
cube[0].strip();
cube[0].build();
world.addObject(cube[0]);

cube[1].setTexture("mark");
cube[1].strip();
cube[1].build();
world.addObject(cube[1]);

cube[1].setCollisionMode(Object3D.COLLISION_CHECK_OTHERS);


and then I was doing picking like this as the thread http://www.jpct.net/wiki/index.php/Picking  did.

Code: [Select]
SimpleVector dir=Interact2D.reproject2D3DWS(world.getCamera(), fb, (int)AppConfig.screenX, (int)AppConfig.screenY ).normalize();;
Object[] res = world.calcMinDistanceAndObject3D(world.getCamera().getPosition(), dir, 10000 /*or whatever*/);
judgePicking(res[1]);


Code: [Select]
public void judgePicking(Object object)
{
if(object.equal(cube[1]))
{
Log.i("Path", "Picking");
}
else {
Log.i("Path", "NULL");
}
}

I always get "null" from the function of "judgePicking()". I don't know what goes wrong.
anyone could help me?  Thanks very much.



4
Support / The texture on sphere appeared not properly
« on: August 09, 2011, 11:59:10 am »
     Hi,I'm a newbie for jpct-ae.  I used the getSphere(float scale) Function of Primitives Class.  and then map a earth on it.   I found that the sphere appeared not properly.  I also use the opengl es of android to draw a sphere and map a texture on it.  It showed correctly.

this is the code sample
Code: [Select]
Texture texture = new Texture(BitmapHelper.rescale(BitmapHelper.convert(context.getResources().getDrawable(R.drawable.earth)),1024,512));
TextureManager.getInstance().addTexture("texture", texture);


// cube = Primitives.getCube(20);
cube = Primitives.getSphere(25, 25);
cube.calcTextureWrapSpherical();
cube.setTexture("texture");
cube.build();

world.addObject(cube);
com.threed.jpct.Camera cam = world.getCamera();
cam.moveCamera(com.threed.jpct.Camera.CAMERA_MOVEOUT,50);
cam.lookAt(cube.getTransformedCenter());
 I also found that  it is slow when the project is generating the sphere!!

anyone met this problem??  thanks

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