或者设置局部变量然后使用xsl：for - each来为内部计算改变视点。
Alternately, you set the local variable and used XSL: for-each to change the point of view for an inner calculation.
当指定表达式的值改变时，监视点将中断程序执行，但必须在表达式中所使用的变量在作用域中时设置监视点。
A watchpoint will break program execution when the specified expression changes value, but it must be set when the variables used in the expression are in scope.
这显而易见的：如果你从一个不同的角度观察对象时，视点替用特效需要改变以反映你新的视点。
This is obvious: if you view the object from a different Angle, the impostor needs to change to reflect your new viewpoint.
实验验证了文中提出的几何约束结构具有不随物体成像视点改变的射影不变量。
The experimental results show that the proposed structure has projective invariant which does not change with the variation of the viewpoints.
其意味着照相机到对象之间距离的改变，因此视点替用特效的分辨率也可能发生适当的改变。
This means that the camera's distance to the object is changing, so the impostor's resolution may need to change as well.
建筑表面根据视点的改变而变化。
中间视合成是实现立体交互式显示的关键技术，即在观察者改变观看位置时，可以通过系统合成的虚拟视点获得环视的效果。
This paper proposes an intermediate view synthesis algorithm based on image mosaic to create the virtual view image by exploiting view interpolation and morphings.
第一种情形是当你屏幕空间的包围矩形改变大小的时候，需要重新创建视点替用特效纹理。
A first situation in which you should recreate your impostor texture is if the screen-space bounding rectangle changes size.
第一种情形是当你屏幕空间的包围矩形改变大小的时候，需要重新创建视点替用特效纹理。
A first situation in which you should recreate your impostor texture is if the screen-space bounding rectangle changes size.
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