各坐標的轉換： 1.WorldToScreenPoint：

Transforms position from world space into screen space.

從世界空間到屏幕空間變換位置。

Screenspace is defined in pixels. The bottom-left of the screen is (0,0); the right-top is (pixelWidth,pixelHeight). The z position is in world units from the camera.

屏幕空間以像素定義，屏幕左下為0,0，右上是(pixelWidth,pixelHeight)，Z的位置是以世界單位衡量的到相機的距離。

2.ScreenToWorldPoint：

Transforms position from screen space into world space.

從屏幕空間到世界空間的變化位置。

Screenspace is defined in pixels. The bottom-left of the screen is (0,0); the right-top is (pixelWidth,pixelHeight). The z position is in world units from the camera.

屏幕空間以像素定義。屏幕的左下為(0,0)；右上是(pixelWidth,pixelHeight)，Z的位置是以世界單位衡量的到相機的距離。

3.WorldToViewportPoint：

Transforms position from world space into viewport space.

從世界空間到視窗空間的變換位置。

Viewport space is normalized and relative to the camera. The bottom-left of the camera is (0,0); the top-right is (1,1). The z position is in world units from the camera.

視口空間是歸一化的并相對于相機的。相機的左下為（0,0）；右上是（1,1），Z的位置是以世界單位衡量的到相機的距離。

4.ViewportToWorldPoint：

Transforms position from viewport space into world space.

從視窗空間到世界空間的變換位置。

Viewport space is normalized and relative to the camera. The bottom-left of the camera is (0,0); the top-right is (1,1). The z position is in world units from the camera.

視口空間是歸一化的并相對于相機的，相機的左下為（0,0）；右上是（1,1）；Z的位置是以世界單位衡量的到相機的距離。

Note that it transforms a x-y screen position, into a x-y-z position in 3D space.

請注意它是變換一個x-y屏幕位置到一個3D空間的x-y-z位置。

You provide the function with a vector where the x-y components of the vector are the screen coordinates and the z component is the distance of the resulting plane from the camera.

這個函數帶有在屏幕坐標的x-y組件向量，并且z組件是在從相機產生的平面的距離。

5.ViewportToScreenPoint：

Transforms position from viewport space into screen space.

從視口空間到屏幕空間的變換位置。

Viewport space is normalized and relative to the camera. The bottom-left of the camera is (0,0); the top-right is (1,1). The z position is in world units from the camera.

視口空間是規范化的并相對于相機。相機的左下為（0,0），右上是（1,1），Z的位置是以世界單位衡量的到相機的距離。

Screenspace is defined in pixels. The bottom-left of the screen is (0,0); the right-top is (pixelWidth,pixelHeight). The z position is in world units from the camera.

屏幕空間以像素定義。屏幕的左下為（0,0）；右上是(pixelWidth,pixelHeight)，Z的位置是以世界單位衡量的到相機的距離。

6.ScreenToViewportPoint

Transforms position from screen space into viewport space.

從屏幕空間到視窗空間的變換位置。

Screenspace is defined in pixels. The bottom-left of the screen is (0,0); the right-top is (pixelWidth,pixelHeight). The z position is in world units from the camera.

屏幕空間以像素定義。屏幕的左下為（0,0）；右上是(pixelWidth,pixelHeight)，Z的位置是以世界單位衡量的到相機的距離。

Viewport space is normalized and relative to the camera. The bottom-left of the camera is (0,0); the top-right is (1,1). The z position is in world units from the camera.

視口空間是規范化的并相對于相機。相機的左下為（0,0）；右上是（1,1），Z的位置是以世界單位衡量的到相機的距離。

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