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我渲染了一个对象，我正在尝试用鼠标旋转对象。对象将正常旋转 180 度，但在那之后，对象会反转（如果面向相机，则切换为背对相机），就像鼠标的预期移动一样，即如果向右拖动鼠标会顺时针旋转对象，然后它现在将逆时针旋转。一旦达到下一个 180 度，它就会再次反转并恢复正常。我敢肯定一定有一些我没有看到的简单的东西？

这是我的代码：

// Detect mouse state
void
mouse(int button, int state, int x, int y)
{
    if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN)
    {
        moving = 1;
        beginX = x;
        beginY = y;
    }
    if (button == GLUT_LEFT_BUTTON && state == GLUT_UP)
    {
        moving = 0;
    }
}

// Detect mouse movement
void motion(int x, int y)
{
    if (moving)
    {
        angleX = (angleX + (x - beginX));
        angleY = (angleY + (y - beginY));
        beginX = x;
        beginY = y;
        newModel = 1;
        glutPostRedisplay();
    }
}

// Rotate object
void recalcModelView(void)
{
    // Get object's centre
    int hh = head->GetHeight() / 2;
    int hw = head->GetWidth() / 2;
    int hd = head->GetDepth() / 2;
    glPopMatrix();
    glPushMatrix();
    // Rotate object based on mouse movement
    glTranslatef(hw, hd, hh);
    float temp1 = angleX / 5;
    float temp2 = angleY / 5;
    printf("TEMP1: %g\n", temp1);
    printf("TEMP2: %g\n", temp2);
    glRotatef(temp1, 0.0, 1.0, 0.0);
    glRotatef(-temp2, 1.0, 0.0, 0.0);
    glTranslatef(-hw, -hd, -hh);
    newModel = 0;
}
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1 回答 1

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Use something like Arcball to fix this.

于 2013-03-28T19:38:43.397 回答