如何在相对于观看方向的地形中移动

How to move around in a terrain with respect to the viewing direction

本文关键字：移动 方向 相对于观      更新时间：2023-10-16

我想在地形(δx，m_mouseMovement的δy(中相对于当前观看方向向左/向右，向前/向后移动。以下代码适用于缩放(鼠标滚轮(。但是，只有当观看方向正好沿 x 轴时，移动才有效：

Vector3D m_position;
Vector2D m_mouseMovement; // delta x,y amount the mouse was moved on the screen
int m_mouseWheelSteps;
QVector3D direction(...);
QVector3D right(...);
QVector3D up = QVector3D::crossProduct(right, direction);
m_position += m_mouseWheelSteps * direction; // zoom in and out; ok
// m_position += Vector3D(m_mouseMovement.x*right.x, 0, m_mouseMovement.z*right.z); // does not work properly; it always moves along the x/z axis
QMatrix4x4 modelMatrix;
//modelMatrix.scale, translate, etc. the terrain
QMatrix4x4 viewMatrix;
viewMatrix.lookAt(m_position, m_position+direction, up);
QMatrix4x4 mvMatrix = viewMatrix * modelMatrix;
QMatrix4x4 projectionMatrix;
projectionMatrix.perspective(...);
QMatrix4x4 mvpMatrix = projectionMatrix*mvMatrix;

我无法弄清楚如何使它工作以使运动独立于观看方向？

简单的解决方案：

m_position += m_mouseMovement.x*Vector3D(right.x, 0, right.z);
//m_position += m_mouseMovement.y*Vector3D(up.x, 0, up.z);
m_position += m_mouseMovement.z*Vector3D(direction.x, 0, direction.z);
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