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## 3S原理及应用2

(2007-04-23 13:35:12)
 分类： 专业知识
半透明表面平坦("二维")

So now, how do we simulate it?现在,我们要如何模拟? Well, first comes the simple solution.好,首先是简单的解决办法. We'll start with the 2d case.一会儿我们先从二维案. As in, if you've ever placed a light behind a piece of paper, you've noticed light gets through.如,如果您放置了以往轻纸后面,您看到轻获得通过. What's more, if you stick you hand between the light and the paper you see the shadow of your hand through the paper.何况如果你坚持你的手间轻皮你看你的手的阴影透过纸张.

This is simple 2d translucency, and can be simulated a number of different ways in max.这是一个简单的二维半透明、可以模拟各种不同方式马克斯. The easiest is using the Translucency spinner in the raytrace material.最容易的是使用半透明17.5raytrace材料.

Here's the scene setup.这里的现场设置.

Here's with no translucency (the white dot is the location of the light).这里的无半透明(白色斑点是根据所在地).

Here's with translucency.这里的同半透明. We see light from behind the surface, as well as the shadow of the ball.我们看到光从表面背后,以及球的阴影.

This technique sorta work on non flat objects...这种技术工作不sorta物体单位:

But when you use a shadow casting light (shadow maps, in this case), shadows look weird.但是当你用铸轻阴影(阴影地图,在这种情况下),怪异的影子. That is why max raytrace translucency should only be used in cases such as paper, curtains, lamp shades, anything that has no great thickness to it.这就是为什么马克斯raytrace半透明只能用例如纸张、窗帘、灯具等色系,凡是没有伟大的厚度.

Self-Illumination Trick ("2D")自我照明伎俩("二维")

Another trick I've used now and again is using self illumination to fake translucency on flat objects.我用另一种手法是利用自身墨绿色半透明照度为假冒单位物体. This really only works in static shots where you don't need any interaction with the object, but it can give you the same general effect.这一工程的静态镜头真的只有你不需要任何互动对象,但它可以给你同样的效果一般. For example, here's a file called lantern.max (max 5) to make the lantern below.例如,这里的一个档案名为lantern.max(最高5)作花灯下文. I just placed a gradient map inside of the self illumination slot of the material to simulate a glow coming from a light source on the interior of the lamp.我只是地图内放置了<自照度梯度槽的材料模拟辉光来自于室内光源的灯具. Note, the light inside the max scene isn't actually being used to illuminate the object, I just placed it in there to turn off max's default lights.注,轻内马克斯现场其实不是用来照亮物体我只是摆在那里关掉马克斯违约红光.

Another thing to try is to use a raytrace material instead, and place the gradient inside the Extra Lighting map slot.另一件事是试图用raytrace物质反而广场内、外照明梯度图槽.

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