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Dmax灯光问题,lm与cd的区别

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发表于 2016-2-3 12:04:00 | 显示全部楼层 |阅读模式
3Dmax灯光区域的lm和cd是什么意思啊,太专业的,似懂非同,举个形象的好懂的例子。。,没明白,一头雾水。1lm是多少W,1cd是多少W。。。筒灯一般是多少W,普通用的灯光是多少W。。我上传的图片,,要怎么用啊。。里面那么多的灯,什么时候用。

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 楼主| 发表于 2019-5-30 12:04:24 | 显示全部楼层
im是光通量的单位。发光强度为1坎德拉(cd)的点光源,在单位立体角(1球面度)内发出的光通量为“1流明”。英文缩写(lm)。 所谓的流明简单来说,就是指蜡烛一烛光在一公尺以外的所显现出的亮度.一个普通40瓦的白炽灯泡,其发光效率大约是每瓦10流明,因此可以发出400流明的光. 40瓦的白炽灯220伏时,光通量为340流明。光通量是描述单位时间内光源辐射产生视觉响应强弱的能力,单位是流明,也叫明亮度。投影仪表示光通量的单位是ANSI流明,ANSI流明是美国国家标准化协会制定的测量投影仪光通量的标准,它测量屏幕"田"字形九个交叉点上的各点照度,乘以面积,再求九点的平均值,即为该投影仪的ANSI流明。流明值越高表示越亮,明亮度越高则在投影时就不需要关灯。。。
cd也是一种光的单位这里我就不说了。。都一样。这些单位都没所谓的你只要用惯一个就好了。你用im的话值很小就够了,cd的话就要大一点的数值。你说的软件自带灯都没用,我都是用下载的灯光文件,数值都定好的。
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