Question

@Anton我坚持这种翻转。

我从here下载了该项目。我有四个按钮，每个按钮将标题设置为str变量的右，左，底，顶。

渲染初始旋转轴为teapotNode_.rotationAxis = CC3VectorMake（0.1,1,0.3）;

- (void)update:(float)dt
{

    if ([str isEqualToString:@"right"])
    {

        teapotNode_.rotationAxis = CC3VectorMake(0.1, 1, 0.3);
        angle +=2.0;
    }
    else if ([str isEqualToString:@"left"])
    {

        teapotNode_.rotationAxis = CC3VectorMake(0.1, 1, 0.3);
        angle -=2.0;
    }
    else if ([str isEqualToString:@"bottom"])
    { 

        teapotNode_.rotationAxis = CC3VectorMake(1,0,0);
        angle +=2.0;

    }
    else if ([str isEqualToString:@"top"])
    {

        teapotNode_.rotationAxis = CC3VectorMake(1,0,0);
        angle -=2.0;

    }   
    else{

        angle +=2.0;
    }    
    teapotNode_.rotationAngle = angle;

}

我触摸顶部（或）向下旋转按钮更改轴 teapotNode_.rotationAxis = CC3VectorMake（1,0,0）;对象翻转。

我希望使用相同的轴位置将对象从上到下，从下到上旋转。

Answer 1

解决方案是：

你自己说旋转轴值为（0.1,1,0.3）的初始值。所以不要改变这个价值。

该项目本身具有单独的轮换功能。那是teapotNode_.rotation

像这样使用。它对我来说很好。试试这个。

全球声明：

float x=0.0;
float y=0.0;
float z=0.0;
float angle;
float rangle=2.0;
float xangle;
float yangle;


- (void)update:(float)dt
{

    if ([str isEqualToString:@"right"])
    {
        x=0;    y=1;  z=0;              //ROTATE OBJECT IN Y-AXIS(Y=1 & X=0)
        yAngle+=rAngle;                 //GET ANGLE OF OBJECT ROTATION IN Y-AXIS (ANTI CLOCKWISE)
        angle +=rAngle;                 //INCREMENT ANGLE OF OBJECT ROTATION IN ANTICLOCLWISE
    }
    else if ([str isEqualToString:@"left"])
    {
        x=0;    y=1;  z=0;              //ROTATE OBJECT IN Y-AXIS(Y=1 & X=0)
        yAngle-=rAngle;                 //GET ANGLE OF OBJECT ROTATION IN Y-AXIS (CLOCLWISE)
        angle -= rAngle;                //INC ANGLE OF OBJECT ROTATION IN CLOCKWISE

    }
    else if ([str isEqualToString:@"bottom"])
    {
        x=1;    y=0;  z=0;              //ROTATE OBJECT IN X-AXIS(X=1 & Y=0)
        xAngle+=rAngle;                 //GET ANGLE OF OBJECT ROTATION IN X-AXIS (ANTI CLOCKWISE)
        angle += rAngle;                //INC ANGLE OF OBJECT ROTATION

    }
    else if ([str isEqualToString:@"top"])
    {
        x=1;    y=0;  z=0 ;              //ROTATE OBJECT IN Y-AXIS(X=1 & Y=0)
        xAngle-=rAngle;                 //GET ANGLE OF OBJECT ROTATION IN X-AXIS (CLOCLWISE)
        angle -= rAngle;                //INC ANGLE OF OBJECT ROTATION


    }

    else
    {
        angle +=rAngle;
    }
//    teapotNode_.rotationAxis = CC3VectorMake(x, y, z);
//    teapotNode_.rotationAngle = angle;
    teapotNode_.rotation = CC3VectorMake(xAngle, yAngle, 0);

}

单击顶部和底部按钮，在opengl中翻转obj模型？

1 个答案: