zjh364782309 zjh364782309
影视动画,影视后期,平面设计
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问个很简单确又有点睛之效的小问题~! Atmosphere – One of the things that make CG images look very CG is that their color stays the same across vast distances. In real life (assuming you are on a decent-sized planet’s surface) you view distant objects through a lot of air. This air has color and opacity that blocks/scatters the light moving through it. So if you are looking at objects more than a few meters away, you should add some sort of atmosphere to your render (usually best done in your compositing package). Render out a depth-from-camera pass (z-depth), bring it into your comp package, adjust the values with expand/gamma/curves, multiply it by your fog color, and add it back in on top of your image. This additional atmosphere really helps to sell that your image exists in the world, and gives it a sense of depth. 大气。CG 图之所以一眼就被看穿的原因之一就是物体的颜色无论多远都是一样的。在现实生活中,假设你站在正常大小的星球表面,你是隔着一堆空气看远方的物体的。这些气体有颜色,有不透明度,会阻挡和打散在其内传播的光。所以如果你的物体是几米开外的,最好加一些大气的效果进去(一般在合成软件里实现是最好的方法)。渲染一张 Z-Depth 的通道,放到合成软件里,用扩展、gamma、曲线工具调整,添加上雾颜色的乘数,然后放到图像的最上层。这一层额外的大气可以显著增加作品的可信度。 我想问下这个Z-Depth 是不是摄像机的景深?还有用mental ray 的多通道能渲染出来么?
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