1. 衰减贴图：我列出的材质都是使用了光线追踪材质(Raytrace),通过对固有色通道(Diffuse),反射通道(Reflect),透明通道(Traesparency控制折射),雾颜色通道(Fog Colcr模拟次表面透明),透明通道(Traesparency)的控制配合衰减贴图(Falloff)来实现效果.

2. 衰减区：为了很好地实现这一目的,可以分别调整这两盏灯光的聚光区(hotspot)和衰减区(falloff)大小. 聚光区是聚光灯最亮的照射区域,衰减区是聚光灯由最亮到无光的渐变区域. 至于图中的叠合区域,是背景光衰减区与主光衰减区重叠形成平滑照明的区域.

noun

1. a noticeable deterioration in performance or quality

    e.g. the team went into a slump
           a gradual slack in output
           a drop-off in attendance
           a falloff in quality

    Synonym: slumpslackdrop-offfalling off