The one-dimensional Boolean evaluation algorithm for two-level CSG model is explored and its application in the shading image processing is implemented.
研究了二层树结构CSG模型一维布尔运算的快速算法，并给出了在图形显示应用中的实例。
The attribute value is an XPath expression that results in a Boolean after evaluation.
属性值是一个XPath表达式，表达式的计算结果必须是布尔值。
The attribute value is an XPath expression that results in a Boolean after evaluation.
属性值是一个XPath表达式，表达式的计算结果必须是布尔值。
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