Android 带网格的三维拾取
当用户轻触android手机屏幕时，我正在尝试3d拾取 它有时会工作，但当我旋转屏幕-->时，光线不会击中球体 我将使用我目前拥有的源代码粘贴源代码： a） class renderer.java:Android 带网格的三维拾取,android,opengl-es,3d,picking,Android,Opengl Es,3d,Picking,当用户轻触android手机屏幕时，我正在尝试3d拾取 它有时会工作，但当我旋转屏幕-->时，光线不会击中球体 我将使用我目前拥有的源代码粘贴源代码： a） class renderer.java: ... // variables used public static picking gPicker = null; public static vector3 campos = new vector3(0,0, 500); public s
... // variables used
public static picking gPicker = null;
public static vector3 campos = new vector3(0,0, 500);
public static vector3 sphpos = new vector3(60,-40,0);
...
... // this function is called when user taps Screen
public void screenWasTapped(vector2 touchcoords)
{
// get current time
now = System.currentTimeMillis();
// can shoot/tap every 100 msecs., not earlyer.
if (now > mLastFiredTime + mInterval)
{
// do we have a valid GL context?
if(gGL!=null)
{
// screen was tapped , so call "pick" function wich will check if ray hits sphere wich is located at "sphpos".
gPicker.pick(gGL, gScreenWidth, gScreenHeight, touchcoords.x, touchcoords.y);
// update last time
mLastFiredTime = now;
}
}
}
....
public void onSurfaceChanged(GL10 gl, int width, int height)
{
// To prevent divide by zero
if (height == 0) height = 1;
float aspect = (float) width/height;
// Set the viewport (display area) to cover the entire window
gl.glViewport(0, 0, width, height);
// Setup perspective projection, with aspect ratio matches viewport
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
// Use perspective projection
GLU.gluPerspective(gl, 60.0f, aspect, 0.1f, 5000.f);
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
// Fast Perspective Calculations
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);
gl.glEnable(GL10.GL_TEXTURE_2D);
// Enable GL Blending.
gl.glEnable(GL10.GL_BLEND);
gl.glBlendFunc(GL10.GL_ONE, GL10.GL_ONE_MINUS_SRC_ALPHA);
// Drawing order & culling face settings.
gl.glFrontFace(GL10.GL_CW); // Front face in counter-clockwise orientation
gl.glEnable(GL10.GL_CULL_FACE); // Enable cull face
gl.glCullFace(GL10.GL_BACK); // Cull the back face (don't display)
gScreenWidth = width;
gScreenHeight = height;
}
public void onDrawFrame(GL10 gl)
{
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
gTimer.startupdate();
float dt = gTimer.getElapsed();
gl.glLoadIdentity();
gl.glTranslatef(-campos.x, -campos.y, -campos.z);
gl.glRotatef(tableRotXAngle, 1, 0, 0);
gl.glRotatef(tableRotYAngle, 0, 1, 0f);
gl.glColor4f(0,1,1,1);
gl.glPushMatrix();
gl.glTranslatef(sphpos.x,sphpos.y,sphpos.y);
newgame.gPyramid.render(gl); // draw pyramid at 3d location specified by "sphpos"
gl.glPopMatrix();
gl.glColor4f(1,1,1,1);
doGameAI(dt);
doDisplayHUD(gl);
gTimer.stopupdate();
gl.glFlush();
}
public class picking
{
picking(GL10 gl)
{
MatrixGrabber mg = new MatrixGrabber();
mg.getCurrentState(gl);
}
(UPDATED)
public void pick(GL10 gl, int width, int height, float xTouch, float yTouch)
{
MatrixGrabber mg = new MatrixGrabber();
mg.getCurrentState(gl);
int[] viewport = {0, 0, width, height};
float[] nearCoOrds = new float[3];
float[] farCoOrds = new float[3];
float[] temp = new float[4];
// float[] temp2 = new float[4];
float winx = xTouch, winy =(float)viewport[3] - yTouch;
displayMatrix(mg.mModelView);
displayMatrix(mg.mProjection);
int result = GLU.gluUnProject(winx, winy, 0.0f, mg.mModelView, 0, mg.mProjection, 0, viewport, 0, temp, 0);
// Matrix.multiplyMV(temp2, 0, mg.mModelView, 0, temp, 0);
if(result == GL10.GL_TRUE){
nearCoOrds[0] = temp[0] / temp[3];
nearCoOrds[1] = temp[1] / temp[3];
nearCoOrds[2] = temp[2] / temp[3];
}
Log.d("redwing", " ---> near pos " + Float.toString(nearCoOrds[0]) + ","
+ Float.toString(nearCoOrds[1]) + ","
+ Float.toString(nearCoOrds[2]));
result = GLU.gluUnProject(winx, winy, 1.0f , mg.mModelView, 0, mg.mProjection, 0, viewport, 0, temp, 0);
// Matrix.multiplyMV(temp2,0, mg.mModelView, 0, temp, 0);
if(result == GL10.GL_TRUE){
farCoOrds[0] = temp[0] / temp[3];
farCoOrds[1] = temp[1] / temp[3];
farCoOrds[2] = temp[2] / temp[3];
}
Log.d("redwing", " ---> far pos " + Float.toString(farCoOrds[0]) + ","
+ Float.toString(farCoOrds[1]) + ","
+ Float.toString(farCoOrds[2]));
vector3 rayDirection = new vector3(farCoOrds[0]-nearCoOrds[0], farCoOrds[1]-nearCoOrds[1], farCoOrds[2]-nearCoOrds[2]);
Log.d("redwing", " ---> raylen ="+ Float.toString(rayDirection.getLength()));
rayDirection.setUnit();
Log.d("redwing", " ---> dir " + Float.toString(rayDirection.x) + ","
+ Float.toString(rayDirection.y) + ","
+ Float.toString(rayDirection.z));
if(rayHitSphere(renderer.campos, rayDirection, renderer.sphpos, 10))
{
Log.e("redwing", "****************");
Log.e("redwing", "ray hits OBJECT!");
Log.e("redwing", "****************");
}
}
boolean rayHitSphere(vector3 rayPos, vector3 rayDir, vector3 sphereCntr, float radius)
{
vector3 w = rayPos.sub(sphereCntr);
float A = rayDir.dot(rayDir);
float B = 2*w.dot(rayDir);
float C = w.dot(w) - radius*radius;
float D = B*B-4.0f*A*C;
if(D>=0.0f)
return true;
else
return false;
}
void displayMatrix(float[] m, String tag)
{
for(byte i=0;i<4;i++)
{
Log.v("redbase "+tag, "mtx" + Byte.toString(i) + " - " + new DecimalFormat("#.####").format(m[i*4+0])+","
+ new DecimalFormat("#.####").format(m[i*4+1])+","
+ new DecimalFormat("#.####").format(m[i*4+2])+","
+ new DecimalFormat("#.####").format(m[i*4+3]));
}
}
公共类选取
{
拣选（GL10 gl）
{
MatrixGrabber mg=新MatrixGrabber（）；
mg.getCurrentState（德国劳埃德船级社）；
}
（更新）
公共空心拾取（GL10 gl、整型宽度、整型高度、浮点X触摸、浮点Y触摸）
{
MatrixGrabber mg=新MatrixGrabber（）；
mg.getCurrentState（德国劳埃德船级社）；
int[]视口={0,0，宽度，高度}；
float[]nearCoOrds=新的float[3]；
float[]farCoOrds=新的float[3]；
浮动[]温度=新浮动[4]；
//float[]temp2=新的float[4]；
float winx=xTouch，winy=（float）视口[3]-yTouch；
显示矩阵（mg.mModelView）；
显示矩阵（mg.m投影）；
int result=GLU.glunproject（winx，winy，0.0f，mg.mModelView，0，mg.mProjection，0，viewport，0，temp，0）；
//矩阵。多重平均值（temp2，0，mg.mModelView，0，temp，0）；
如果（结果==GL10.GL\u真）{
nearCoOrds[0]=temp[0]/temp[3]；
nearCoOrds[1]=temp[1]/temp[3]；
nearCoOrds[2]=临时[2]/临时[3]；
}
Log.d（“redwing”，“-->near pos”+Float.toString（nearCoOrds[0]）+，”
+Float.toString（nearCoOrds[1]）+“，”
+Float.toString（nearCoOrds[2]）；
结果=GLU.glunproject（winx，winy，1.0f，mg.mModelView，0，mg.mProjection，0，viewport，0，temp，0）；
//矩阵。多重平均值（temp2,0，mg.mModelView，0，temp，0）；
如果（结果==GL10.GL\u真）{
farCoOrds[0]=temp[0]/temp[3]；
farCoOrds[1]=temp[1]/temp[3]；
farCoOrds[2]=temp[2]/temp[3]；
}
Log.d（“redwing”，“-->far pos”+Float.toString（farCoOrds[0]）+”，“
+Float.toString（farCoOrds[1]）+“，”
+Float.toString（farCoOrds[2]）；
vector3光线方向=新矢量3（farCoOrds[0]-nearCoOrds[0]，farCoOrds[1]-nearCoOrds[1]，farCoOrds[2]-nearCoOrds[2]）；
Log.d（“redwing”，“-->raylen=“+Float.toString（rayDirection.getLength（）））；
rayDirection.setUnit（）；
Log.d（“redwing”、“-->dir”+Float.toString（rayDirection.x）+”
+Float.toString（光线方向.y）+“，”
+Float.toString（raydroduction.z））；
if（光线球体（renderer.campos、光线方向、renderer.sphpos、10））
{
Log.e（“红翼”，“*************”）；
e（“红翼”，“射线击中目标！”）；
Log.e（“红翼”，“*************”）；
}
}
布尔光线球体（矢量3光线位置、矢量3光线方向、矢量3球体中心、浮动半径）
{
vector3 w=光线位置sub（sphereCntr）；
浮点A=光线方向点（光线方向）；
浮动B=2*w.dot（rayDir）；
浮点数C=w。点（w）-半径*半径；
浮点数D=B*B-4.0f*A*C；
如果（D>=0.0f）
返回true；
其他的
返回false；
}
void displayMatrix（浮点[]m，字符串标记）
{
对于（字节i=0；位置0.011649653附近的i，-0.0066829454499.9
06-02 12:15:22.661:D/redwing（5524）：->far位置581.6618，-333.6764，-4493.4097
06-02 12:15:22.661:D/红翼（5524）：-->raylen=5038.134
06-02 12:15:22.661:D/红翼（5524）：-->dir 0.115449525，-0.06622883，-0.991103
06-02 12:15:22.661:E/红翼（5524）：****************
06-02 12:15:22.661:E/红翼（5524）：射线击中目标！
06-02 12:15:22.661:E/红翼（5524）：****************
06-02 12:15:30.671:D/redwing（5524）：屏幕分辨率480x764
06-02 12:15:30.671:D/红翼（5524）：分接坐标（337.04843440.11392
06-02 12:15:30.671:V/redbase（5524）：mtx0-0.9684,0.1802,0.1725,0
06-02 12:15:30.671:V/redbase（5524）：mtx1-0,0.6913，-0.7226,0
06-02 12:15:30.681:V/redbase（5524）：mtx2--0.2495,0.6997,0.6695,0
06-02 12:15:30.681:V/redbase（5524）：mtx3-0,0，-500,1
06-02 12:15:30.681:V/redbase（5524）：mtx0-2.7568,0,0,0
06-02 12:15:30.681:V/redbase（5524）：mtx1-0,1.7321,0,0
06-02 12:15:30.681:V/redbase（5524）：mtx2-0,0，-1，-1
06-02 12:15:30.681:V/redbase（5524）：mtx3-0,0，-0.2,0
06-02 12:15:30.681:D/红翼（5524）：-->86.22043，-361.2092334.655号位置附近
06-02 12:15:30.691:D/红翼（5524）：-->far位置-144.609532943.3904，-3498.0571
06-02 12:15:30.691:D/红翼（5524）：-->raylen=5065.9
06-02 12:15:30.691:D/redwing（5524）：-->dir-0.04556544,0.65232235，-0.7565708
- 如果我不旋转场景，那么我就成功了
- 但是…如果我旋转场景，那么就没有点击：（
- 不是100%肯定我理解所有代码，但在我看来，您不应该将gluUnproject的结果与modelview矩阵相乘
如果unproject在世界坐标中给出了单击位置，并且您正在世界坐标中对球体位置进行测试，我不明白您为什么要通过modelview转换unproject
如果您确实想将点击转换为相机空间，那么您的球体位置也需要进行转换，我看这还没有完成。从最初的代码浏览来看，这似乎是一个屏幕分辨率改变的问题。当屏幕旋转时，您的代码似乎没有转换宽度和高度。这可以d是关闭的，但这是一个可能的问题。ok，然后执行两个步骤：1）使用modelview mtx转换球体位置，2）删除矩阵。multipleYMV（temp2,0，mg.mModelView，0，tem
Here are some values from Eclipse console when User tapped screen:
(UPDATED - i get a Hit!)
<<< NOT ROTATED SCENE >>
06-02 12:15:22.611: D/redwing(5524): screen resolution 480x764
06-02 12:15:22.611: D/redwing(5524): tapped coordinate ( 317.07507,426.2164
06-02 12:15:22.621: V/redbase(5524): mtx0 - 1,0,0,0
06-02 12:15:22.631: V/redbase(5524): mtx1 - 0,1,0,0
06-02 12:15:22.631: V/redbase(5524): mtx2 - 0,0,1,0
06-02 12:15:22.631: V/redbase(5524): mtx3 - 0,0,-500,1
06-02 12:15:22.641: V/redbase(5524): mtx0 - 2.7568,0,0,0
06-02 12:15:22.641: V/redbase(5524): mtx1 - 0,1.7321,0,0
06-02 12:15:22.641: V/redbase(5524): mtx2 - 0,0,-1,-1
06-02 12:15:22.651: V/redbase(5524): mtx3 - 0,0,-0.2,0
06-02 12:15:22.651: D/redwing(5524): ---> near pos 0.011649653,-0.0066829454,499.9
06-02 12:15:22.661: D/redwing(5524): ---> far pos 581.6618,-333.6764,-4493.4097
06-02 12:15:22.661: D/redwing(5524): ---> raylen =5038.134
06-02 12:15:22.661: D/redwing(5524): ---> dir 0.115449525,-0.06622883,-0.991103
06-02 12:15:22.661: E/redwing(5524): ****************
06-02 12:15:22.661: E/redwing(5524): ray hits OBJECT!
06-02 12:15:22.661: E/redwing(5524): ****************
<<< ROTATED SCENE!! UPDATED - Still NO HIT! >>
06-02 12:15:30.671: D/redwing(5524): screen resolution 480x764
06-02 12:15:30.671: D/redwing(5524): tapped coordinate ( 337.04843,440.11392
06-02 12:15:30.671: V/redbase(5524): mtx0 - 0.9684,0.1802,0.1725,0
06-02 12:15:30.671: V/redbase(5524): mtx1 - 0,0.6913,-0.7226,0
06-02 12:15:30.681: V/redbase(5524): mtx2 - -0.2495,0.6997,0.6695,0
06-02 12:15:30.681: V/redbase(5524): mtx3 - 0,0,-500,1
06-02 12:15:30.681: V/redbase(5524): mtx0 - 2.7568,0,0,0
06-02 12:15:30.681: V/redbase(5524): mtx1 - 0,1.7321,0,0
06-02 12:15:30.681: V/redbase(5524): mtx2 - 0,0,-1,-1
06-02 12:15:30.681: V/redbase(5524): mtx3 - 0,0,-0.2,0
06-02 12:15:30.681: D/redwing(5524): ---> near pos 86.22043,-361.2092,334.655
06-02 12:15:30.691: D/redwing(5524): ---> far pos -144.60953,2943.3904,-3498.0571
06-02 12:15:30.691: D/redwing(5524): ---> raylen =5065.9
06-02 12:15:30.691: D/redwing(5524): ---> dir -0.04556544,0.65232235,-0.7565708