这是一个比较长的介绍Houdini中的Arnold的教学。主要关注于材质球的制作，但是我们也会看看照明，HDRI，渲染设置，曲度图，三平面映射，范围适配，RAMP，还有实例化，属性，点渲染与DOF

This is a relatively long introduction to Arnold in Houdini. The primary focus is on shader building but we'll also take a look at Lights, HDRI , Render Settings, Curvature Map, Triplanar mapping, Fit range, Ramps, Instances, Attributes, Point Rendering and DOF.

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