Threejs开发3D地图实践总结

distance *= Math.tan(scope.object.fov / 2 * Math.PI / 180);

// var xd = 2 * distance * deltaX / element.clientHeight;

// var yd = 2 * distance * deltaY / element.clientHeight;

// panLeft( xd, scope.object.matrix );

// panUp( yd, scope.object.matrix );

var deltaX = pxl * element.clientHeight / (2 * distance);

var deltaY = pyl * element.clientHeight / (2 * distance) * (moveDown ? -1 : 1);

return [deltaX, deltaY];

} else if ( scope.object instanceof OrthographicCamera ) {

// orthographic

// panLeft( deltaX * ( scope.object.right - scope.object.left ) / scope.object.zoom / element.clientWidth, scope.object.matrix );

// panUp( deltaY * ( scope.object.top - scope.object.bottom ) / scope.object.zoom / element.clientHeight, scope.object.matrix );

var deltaX = pxl * element.clientWidth * scope.object.zoom / (scope.object.right - scope.object.left);

var deltaY = pyl * element.clientHeight * scope.object.zoom / (scope.object.top - scope.object.bottom);

return [deltaX, deltaY];

} else {

// camera neither orthographic nor perspective

console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - pan disabled.' );

}

7、2/3D切换

23D切换的重要内容就是当相机的视线轴与场景的平面垂直时，应用平行投影，如许用户只能看到顶面给人的感到就是2D视图。所以要根据透视的视锥体计算出平行投影的世景体。

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