我在屏幕上呈现了一个代表汽车(或类似物)的立方体。
使用投影/模型矩阵和Glm我可以沿轴向后移动第四个并向左或向右旋转。
我无法使用矢量数学来使立方体向前移动,无论它的当前方向是哪个方向。 (即如果我愿意的话,如果它向右旋转30度,当它向前移动时,它会沿着新轴上的30度角移动。)
我希望我已经正确解释过了。
到目前为止,我已经设法使用glm来移动多维数据集:
glm::vec3 vel; //velocity vector
void renderMovingCube(){
glUseProgram(movingCubeShader.handle());
GLuint matrixLoc4MovingCube = glGetUniformLocation(movingCubeShader.handle(), "ProjectionMatrix");
glUniformMatrix4fv(matrixLoc4MovingCube, 1, GL_FALSE, &ProjectionMatrix[0][0]);
glm::mat4 viewMatrixMovingCube;
viewMatrixMovingCube = glm::lookAt(camOrigin, camLookingAt, camNormalXYZ);
vel.x = cos(rotX); vel.y=sin(rotX);
vel*=moveCube;
//move cube
ModelViewMatrix = glm::translate(viewMatrixMovingCube,globalPos*vel);
//bring ground and cube to bottom of screen
ModelViewMatrix = glm::translate(ModelViewMatrix, glm::vec3(0,-48,0));
ModelViewMatrix = glm::rotate(ModelViewMatrix, rotX, glm::vec3(0,1,0)); //manually turn
glUniformMatrix4fv(glGetUniformLocation(movingCubeShader.handle(), "ModelViewMatrix"), 1, GL_FALSE, &ModelViewMatrix[0][0]); //pass matrix to shader
movingCube.render(); //draw
glUseProgram(0);
}
键盘输入:
void keyboard()
{
char BACKWARD = keys['S']; char FORWARD = keys['W'];
char ROT_LEFT = keys['A']; char ROT_RIGHT = keys['D'];
if (FORWARD) //W - move forwards
{
globalPos += vel;
//globalPos.z -= moveCube;
BACKWARD = false;
}
if (BACKWARD)//S - move backwards
{
globalPos.z += moveCube;
FORWARD = false;
}
if (ROT_LEFT)//A - turn left
{
rotX +=0.01f;
ROT_LEFT = false;
}
if (ROT_RIGHT)//D - turn right
{
rotX -=0.01f;
ROT_RIGHT = false;
}
我的向量在哪里出错了?我想改变立方体的方向(它确实如此),然后向那个方向前进。