min3dとオンラインで見つけたコードを使用してレイピッキングを実装しましたが、実装すると少しオフになることがあります。つまり、1つのボックスをクリックすると、間違ったボックスがピッキングされることがあります。時々、選んだものが画面上にさえない。そもそもこれを実装するにはかなりのコードが必要でしたが、私が呼び出す主な2つのメソッドは次のとおりです。
private void rayPicking(float x, float y)
{
//intersection with near plane
float[] near = new float[4];
GLU.gluUnProject(x, scene.getViewport()[3] - y, 0f, scene.getGrabber().mModelView, 0, scene.getGrabber().mProjection, 0, scene.getViewport(), 0, near, 0);
if (near[3] != 0)
{
near[0] = near[0] / near[3];
near[1] = near[1] / near[3];
near[2] = near[2] / near[3];
}
Number3d near3 = new Number3d(near[0], near[1], near[2]);
//and far plane
float[] far = new float[4];
GLU.gluUnProject(x, scene.getViewport()[3] - y, 1f, scene.getGrabber().mModelView, 0, scene.getGrabber().mProjection, 0, scene.getViewport(), 0, far, 0);
if (far[3] != 0)
{
far[0] = far[0] / far[3];
far[1] = far[1] / far[3];
far[2] = far[2] / far[3];
}
Number3d far3 = new Number3d(far[0], far[1], far[2]);
Box firstPicked = null;
Box currentModel = null;
Number3d currentCoords = null;
Number3d firstPickedCoords = new Number3d();
if (!sceneBoxes.isEmpty())
{
//here we check each model if it was tapped and if several models were tapped, we take only that which is closer to the near clipping plane
Iterator<Box> itr = sceneBoxes.iterator();
while (itr.hasNext())
{
currentModel = itr.next();
currentCoords = new Number3d(currentModel.position().x, currentModel.position().y, currentModel.position().z);
if (picked (far3, near3, currentCoords, 1.2f))
if (firstPicked==null)
{
firstPicked = currentModel;
firstPickedCoords.setAllFrom(currentCoords);
}
else if (Number3d.add(currentCoords, near3).length() < Number3d.add(firstPickedCoords, near3).length())
{
firstPicked = currentModel;
firstPickedCoords.setAllFrom(currentCoords);
}
}
}
if (firstPicked != null) // if model picked
{
String temp = firstPicked.getTitle();
String temp2 = firstPicked.getLink();
Log.w("3d touch working "+temp, "3d touch working "+temp);
Intent intent = new Intent(CurAct.this, WebViewer.class);
intent.putExtra("clkURL", temp2);
intent.putExtra("clkUID", curr_uid);
intent.putExtra("rid", curr_rid);
startActivity(intent);
firstPicked = null;
temp = null;
temp2 = null;
}
}
private boolean picked(Number3d a, Number3d b, Number3d q, float r)
{
float ab = (float) Math.sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y)+(a.z-b.z)*(a.z-b.z));
float aq = (float) Math.sqrt((a.x-q.x)*(a.x-q.x)+(a.y-q.y)*(a.y-q.y)+(a.z-q.z)*(a.z-q.z));
float bq = (float) Math.sqrt((b.x-q.x)*(b.x-q.x)+(b.y-q.y)*(b.y-q.y)+(b.z-q.z)*(b.z-q.z));
float p = (ab + aq + bq) / 2;
float hh = (float) Math.sqrt(p * (p - ab) * (p - aq) * (p - bq));
float h;
if (ab!=0) h = 2 * hh / ab; else h = 2*hh;
if (aq<h) h = aq;
if (bq<h) h = bq;
if (h<r)return true; else return false;
}
今、私は錐台カリングの実装も試みましたが、それを最適化するために多くのことをしなかったため、それがネイティブに実行されていないため、処理が遅くなります。しかし、誰かが見て、多分それをより正確にする方法についてのいくつかの指針を私に与えることができれば、それは素晴らしいでしょう。ここで私はピッキングメソッドを呼び出します。
_glSurfaceView.setOnTouchListener(
new View.OnTouchListener() {
@Override
public boolean onTouch(View arg0, MotionEvent e) {
switch (e.getAction() & MotionEvent.ACTION_MASK)
{
case MotionEvent.ACTION_DOWN:
startX = e.getX();
startY = e.getY();
trace = 0.0f;
time = System.currentTimeMillis();
touchMode = DRAG;
break;
case MotionEvent.ACTION_UP:
// we use ray picking only when the tap wasn't longer than 0.5 sec and if we almost didn't move our finger
//Log.w("this is touch y"+e.getY()+" viewport is"+scene.getViewport()[3], "this is touch x"+e.getX());
if ((System.currentTimeMillis()-time < 500) && (trace<scene.getViewport()[3]*0.075)) rayPicking(e.getX(), e.getY());
time = 0;
case MotionEvent.ACTION_POINTER_UP:
touchMode = NONE;
break;
}
return true;
}
}
);