GGX Shader for Vray

Maya , 3Ds Max172 字

GGX Shader是Vray3.1所加入的一种反射光照模型,来弥补之前Phong,Blinn,Ward三种的不足。
GGX是微表面(microfacet)的材质模型,对于表现表面灯光的反射极为成功,简单来说GGX就是像Blinn一样的shader,只是GGX还要比它更酷十倍!
GGX是根据Trowbridge and Reitz两人发表的分布模型而来的,这个微表面模型跟Blinn或Phong比起来,具有较锐利的峰(peak)与更长的尾。
镜面高光比较:
![](https://aduvfx-1252404142.cos.ap-beijing.myqcloud.com/ueditor/php/upload/image/20160725/1469390572242060.jpg)
相同的光泽度,GGX的细节要比Blinn要多
![](https://aduvfx-1252404142.cos.ap-beijing.myqcloud.com/ueditor/php/upload/image/20160725/1469390594986024.jpg)
GGX细节表现
![](https://aduvfx-1252404142.cos.ap-beijing.myqcloud.com/ueditor/php/upload/image/20160725/1469390612569255.jpg)
Blnn和Ggx细节比较
![](https://aduvfx-1252404142.cos.ap-beijing.myqcloud.com/ueditor/php/upload/image/20160725/1469390653686258.jpg)
![](https://aduvfx-1252404142.cos.ap-beijing.myqcloud.com/ueditor/php/upload/image/20160725/1469390660387866.jpg)
各向异性的支持
![](https://aduvfx-1252404142.cos.ap-beijing.myqcloud.com/ueditor/php/upload/image/20160725/1469390677374129.jpg)
![](https://aduvfx-1252404142.cos.ap-beijing.myqcloud.com/ueditor/php/upload/image/20160725/1469390697284485.jpg)
使用HDR渲染复杂模型
![](https://aduvfx-1252404142.cos.ap-beijing.myqcloud.com/ueditor/php/upload/image/20160725/1469390728873966.jpg)
![](https://aduvfx-1252404142.cos.ap-beijing.myqcloud.com/ueditor/php/upload/image/20160725/1469390739459274.jpg)
![](https://aduvfx-1252404142.cos.ap-beijing.myqcloud.com/ueditor/php/upload/image/20160725/1469390747952540.jpg)
![](https://aduvfx-1252404142.cos.ap-beijing.myqcloud.com/ueditor/php/upload/image/20160725/1469390755298589.jpg)
![](https://aduvfx-1252404142.cos.ap-beijing.myqcloud.com/ueditor/php/upload/image/20160725/1469390765239396.jpg)
![](https://aduvfx-1252404142.cos.ap-beijing.myqcloud.com/ueditor/php/upload/image/20160725/1469390771572273.jpg)
![](https://aduvfx-1252404142.cos.ap-beijing.myqcloud.com/ueditor/php/upload/image/20160725/1469390789223118.jpg)
Ggx是BRDF模型,因此它只具备表面反射的描述,并不包括折射等。

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