Unity組件：Vortex image effect 漩渦圖像特效

The Vortex image effect distorts the rendered image within a circular region. Pixels in the image are displaced around a central circular area by a specified angle; the amount of displacement reduces with distance from the centre, diminishing to zero at the circle's edge. Vortex is similar to another image effect called Twirl, although Twirl distorts the image around a point rather than a circle.

漩渦圖像特效是指在一個圓形區(qū)域內(nèi)扭曲所渲染的圖像。圖像中的像素沿著一個圓形區(qū)域進(jìn)行旋轉(zhuǎn)偏移，而偏移量隨著距中心的距離而逐漸減少，在圓形區(qū)域邊界處降低為0。漩渦圖像特效類似于另一種叫做旋轉(zhuǎn)扭曲的圖像特效，不同的是旋轉(zhuǎn)扭曲特效是將圖像沿著一個點而非一個圓形區(qū)域來旋轉(zhuǎn)圖像。

As with the other image effects, this effect is only available in Unity Pro and you must have the Pro Standard Assets installed before it becomes available.

和其他圖像特效一樣，該特效只能在Unity Pro上進(jìn)行使用，并且在使用之前必須安裝Pro Standard Assets。

Vortex image effect applied to the scene 應(yīng)用于場景的漩渦圖像特效

• Radius 半徑
  The radius of the circle where distortion occurs, given in normalized screen coordinates (ie, a radius of 0.5 is half the size of the screen).
  在給定的歸一化屏幕坐標(biāo)中，圖像扭曲出現(xiàn)的位置上的橢圓半徑（ie，半徑為 0.5 是屏幕大小的一半）
• Angle 角度
  The angle by which pixels are displaced around the central circle.
  中心點的旋轉(zhuǎn)角度
• Center 中心
  The center of the circular region of distortion.
  扭曲處的圓形區(qū)域中心點

Hardware support 硬件支持

This effect requires a graphics card with pixel shaders (2.0) or OpenGL ES 2.0. PC: NVIDIA cards since 2003 (GeForce FX), AMD cards since 2004 (Radeon 9500), Intel cards since 2005 (GMA 900); Mobile: OpenGL ES 2.0; Consoles: Xbox 360, PS3.

這個特效需要顯卡擁有像素著色器（2.0）或者OpenGL ES 2.0。臺式機(jī)：2003年以后的NVIDIA顯卡（GeForce FX），2004年以后的AMD顯卡（Radeon 9500），2005年以后的Intel卡（GMA 900）；移動設(shè)備：OpenGL ES 2.0；控制臺： Xbox 360、 PS3。

All image effects automatically disable themselves when they can not run on end-users graphics card.

所有圖像特效如果無法在用戶顯卡上運(yùn)行時將會自動被關(guān)閉。