1. frustum (of a cone or pyramid)See also 円錐台 えんすいだい, See also 角錐台 かくすいだい
Wikipedia definition
2. FrustumIn geometry, a frustum is the portion of a solid that lies between two parallel planes cutting it. The term is commonly used in computer graphics to describe the three-dimensional region which is visible on the screen, the "viewing frustum", which is formed by a clipped pyramid; in particular, frustum culling is a method of hidden surface determination.
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