Being a point light source the light rays direction on an object surface is given by the line joining the point light source and the point on the surface of the object itself.
Being a point light source the light rays direction on an object surface is given by the line joining the point light source and the point on the surface of the object itself.
作为一个点光源，光线在一个物体表面上的发射方向使用光源所在点和物体表面点之间的连线来确定的。