我一直在嘗試為Android做魔方.我有一個(gè)關(guān)于輪換的問(wèn)題.我想旋轉(zhuǎn)一個(gè)外觀(guān)正確的圖形.這意味著如果用戶(hù)觸摸屏,并且在將手指向右移動(dòng)之后,圖形將從觀(guān)察點(diǎn)的一側(cè)向右旋轉(zhuǎn).但是當(dāng)我旋轉(zhuǎn)一些時(shí),圖形開(kāi)始朝不正確的方向移動(dòng).我了解,這取決于軸是否改變了他們的狀況.但是我嘗試使用逆模型矩陣來(lái)獲取必要的坐標(biāo),但尚未得到結(jié)果.有人可以在鼠標(biāo)或觸摸屏的幫助下給我示例或視覺(jué)上正確旋轉(zhuǎn)3D圖形的鏈接嗎？

//get vector 3D of touch

Vector3f touchVector = getRubikSystemCoordinates(mTouchX,mTouchY,square.rubikRotationMatrix);

//Get vector 3D of move

Vector3f moveVector = getRubikSystemCoordinates(mMoveX,mMoveY,square.rubikRotationMatrix);

//get direction of motion

float direction = touchVector.substractFrom(moveVector);

//get axis for rotation

Vector3f axis = touchVector.vectorProductTo(moveVector);

//normalize axis

axis.normalize();

//get angle of rotation

float angle = direction.length;

//make identity Quad

Quaternion quad = new Quaternion();

//make rotation quad

quad.makeRotationKvaternion(angle,axis);

//from quad recieve matrix

Matrix4f matrix = quad.toMatrix();

//multiply to current modelview matrix

gl.glMultMatrixf(matrix.returnArray(),0);

//save rotation matrix

square.rotationMatrix = square.rotationMatrix.multiply(matrix);

//save modelView matrix

square.saveModelView(square.initMatrix.returnArray());

// touch coords to current modelView coords

private Vector3f getRubikSystemCoordinates(float x, float y, Matrix4f matrix){

// touch coords to normal coords of screen

Vector2f normalCoords = (new Vector2f(x,y)).toNormalScreenCoordinates(Settings.viewPort[2],Settings.viewPort[3]);

// to sphere coords in 3D

Vector3f sphereVector = new Vector3f(normalCoords.x,normalCoords.y, FloatMath.sqrt(2-normalCoords.x*normalCoords.x-normalCoords.y*normalCoords.y));

//Get inverse matrix from ModelView Matrix

Matrix4f m = matrix.inverseMatrix();

//Get vector for current modelView 3D coords

Vector3f vector = m.multiplyToVector(vector);

// make normalize vector

vector.normalize();

return vector;

}

解決方法:

您要尋找的是名為arcball rotation.您將在互聯(lián)網(wǎng)上的Java周?chē)业酱罅抠Y源.

標(biāo)簽：android,opengl-es,rubiks-cube

來(lái)源： https://codeday.me/bug/20191013/1904622.html

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