光线投射的英文：
ray cast

ray是什么意思：
n. 射线；光线；一线；鳐
v. 放射，辐射；照射；闪现

Bear in mind that the chief ray is now principal ray.
记住，此时主光线就是主点光线。

externo-lateral ray
外侧辐肋

concrete for radioactive ray shielding
放射线屏蔽用混凝土

The moon is raying across the bay.
月光照射着整个海湾。

The researches are concerned with alpha rays.
这些研究都是关于阿尔法射线的。

cast是什么意思：
v. 投掷；铸造；计算；投；投射；脱落；挑选；制定；垂钓；描述；（使）弯曲
n. 演员阵容；铸型；特性；投掷

The die is cast
木已成舟

The die is cast.
木已成舟。

The priestly caste does not normally intermarry with the warrior caste.
教士阶级通常不与武土阶级通婚。

A mould for casting—as statues were cast in bronze in mould
熔铸模型

The athlete is practising casting the discus.
运动员正在练习掷铁饼。