public Vector3 calculatePos(int x, int y, Object3D object3D) {
      Matrix4 mViewMatrix = getCurrentCamera().getViewMatrix();
      Matrix4 mProjectionMatrix = getCurrentCamera().getProjectionMatrix();
      double[] mNearPos4 = new double[4];
      double[] mFarPos4 = new double[4];
      Vector3 mNearPos = new Vector3();
      Vector3 mFarPos = new Vector3();
      Vector3 mNewObjPos = new Vector3();

      int[] mViewport = new int[] {0, 0, getViewportWidth(), getViewportHeight()};

      GLU.gluUnProject(
          x,
          getViewportHeight() - y,
          0,
          mViewMatrix.getDoubleValues(),
          0,
          mProjectionMatrix.getDoubleValues(),
          0,
          mViewport,
          0,
          mNearPos4,
          0);

      GLU.gluUnProject(
          x,
          getViewportHeight() - y,
          1.f,
          mViewMatrix.getDoubleValues(),
          0,
          mProjectionMatrix.getDoubleValues(),
          0,
          mViewport,
          0,
          mFarPos4,
          0);

      mNearPos.setAll(
          mNearPos4[0] / mNearPos4[3], mNearPos4[1] / mNearPos4[3], mNearPos4[2] / mNearPos4[3]);
      mFarPos.setAll(
          mFarPos4[0] / mFarPos4[3], mFarPos4[1] / mFarPos4[3], mFarPos4[2] / mFarPos4[3]);

      double factor =
          (Math.abs(object3D.getZ()) + mNearPos.z)
              / (getCurrentCamera().getFarPlane() - getCurrentCamera().getNearPlane());

      mNewObjPos.setAll(mFarPos);
      mNewObjPos.subtract(mNearPos);
      mNewObjPos.multiply(factor);
      mNewObjPos.add(mNearPos);

      return mNewObjPos;
    }
Beispiel #2
0
 /**
  * Left multiplies this {@link Matrix4} with the given one, storing the result in this {@link
  * Matrix}.
  *
  * <pre>
  * A.leftMultiply(B) results in A = BA.
  * </pre>
  *
  * @param matrix {@link Matrix4} The LHS {@link Matrix4}.
  * @return A reference to this {@link Matrix4} to facilitate chaining.
  */
 @NonNull
 public Matrix4 leftMultiply(@NonNull Matrix4 matrix) {
   System.arraycopy(m, 0, mTmp, 0, 16);
   Matrix.multiplyMM(m, 0, matrix.getDoubleValues(), 0, mTmp, 0);
   return this;
 }