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VRay GI caustics实例教程(1)

完全GI caustics,只有一张HDR作为光源,没有打任何灯光
我爱犀牛& VRay :)
580240-ppp02-embed.jpeg

使用的是max的渲染插件vray来做的,使用rhino建模(建模总不用说了吧?)现在来讲如何在HDR的环境里做出caustics(不用任何灯光)
首先,新建一个材质,在反射和折射通道里选择vraymap贴图类型,再根据反射或是折射来决定vraymap的类型(注意别颠倒),其中如下图所示。反射的强度不可太大,折射要很强(透明到无所谓,我的物体都是不透明的)只要贴了折射贴图看上去就透明了。另外还可以更改反射折射的颜色(自己喜好而定)
580498-01-embed.jpeg


反射折射参数
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接下来是重要的HDR参数了
HDR简单来说,就是一张图片带有光的信息,可以作为光源使用,很多渲染软件都支持HDR的。
再新建一材质
在diffuse里面选择bitmap hdr贴图类型,再根据下图的参数设置
如选择一张位图(bmp jpg tag)也可以作为hdr环境的,但是亮度不够
其实hdr就是记录了真实亮度的位图,而且他的光源部分远远比其他部分亮的多
所以可以作为光源。而且是面光源,非常真实
注意一定要在rgb channel output中选择hdr,否则等于是一张bmp
还有强度,要因图而异,我这张图用默认的就好了,而有些图看上去很暗,只要挑高参数,会发现里面有很多微妙的光源,非常有用,不过这参数还是小心一点,不能太亮。
580511-03-embed.jpeg

这是我用的HDR背景,这当然只是示意图。
其中白色部分就是光源所在,楼上的图片中的高光部分就是这里来的
580513-hdr-embed.jpeg

然后就把刚才做好的hdr给环境了
打开环境设置窗口,选择刚才做好的材质
关闭窗口
580517-04-embed.jpeg

接下来就是很重要的vray渲染参数了
打开渲染窗口(f10) 把当前渲染器改为vray,就会出现vray的参数设置
其他暂时别管,先把GI打开,如果不打开,所有的都是白说。
先不要管精度(默认的精度已经不错,速度也可以,我下面的图上的参数是最终渲染比较高的参数)
选择好视图,render……

阿??有人要问了,别的设置呢?呵呵,不用,一般来说,默认的已经可以了
这就是vray的简便所在:)刚才要不是为了反射阿,HDR啊,弄的好复杂,如果是一般材质,都不需要怎么调整,就跟max的默认scanline差不多用(除了反射折射)

还有一点要注意,如果你场景里没有灯,即全用其他光源,一定要建一个灯,无论什么类型,因为max有两个默认的灯,如果让这两个灯存在,整个场景会很亮,很难看的,所以就要自己建一个灯,然后关掉(不是删除)或者把所有物体都排除掉(我就用这个方法)这样就能得到一个干净误光源的场景了
这方法适用于其他max的GI渲染器道理相同
580527-05-embed.jpeg

到这里就结束了,大家觉得如何?
总体来说,vray是一个很不错的渲染器,虽然没有FR,BR这么强大,但是他很好用,简单易学,而且效果不错,特别适合我这类懒人加文盲玩
特别值得一提的是,它的速度真是快

如果您喜欢我的文章,可以订阅我的 谢谢。
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  • 2 Responses to “VRay GI caustics实例教程(1)”


    1. Gravatar Icon

      原创的东西??

      签名
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      有经过整理的资料才是有价值的!

      [回复]

    2. Gravatar Icon

      楼上的说得好啊!!! :em02: :em02:

      [回复]

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