There may be some noticeable glossy specular noise on the surface of the robot due to poor sampling of the indirect specular component of the robot's shader.However, for a final render, you will need to increase this to at least 5 or more depending on the amount of depth of field you have set in the scene. Rendering the scene using the default Camera (AA) setting of 3 is good enough for test renderings.The lower the value, the sharper the reflection. The specular_roughness c ontrols the glossiness of the specular reflections. Increase the metalness to around 0.8 and increase the specular_roughness to around 0.4. To turn it into a brushed metal material we will change the following settings.Create a standard_surface material and assign it to the robot. Now we need to create a brushed metal shader for the robot.The estimated time it will take to complete this tutorial should be no more than 30 minutes. Note that, although 3ds Max and MAXtoA have been used in this tutorial, much of the material is really about Arnold in general and so is also relevant to users of other Arnold implementations such as Maya for Arnold (M toA) and Houdini for Arnold (HtoA), for example.
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Lastly, we will look at how to optimize render settings and eliminate any noise that may appear in the render. We will need to adjust the base and specular parameters to get a believable brushed metal effect. Due to a large number of controls, it is split up into several groups such as base, specular, sub-surface_scattering (SSS), etc. It is very powerful, and allows a large number of different sorts of materials to be created, but can be somewhat daunting at first. The standard_surface shader is a multi-purpose shader capable of producing all types of materials, from simple plastic to car paint or skin. We will use the standard_s urface shader to shade the robot and give it a metallic finish. We will use Arnold's proprietary lights to achieve a physically accurate, photo-realistic lighting setup. In this tutorial, w e will cover how to build a simple photographic lighting studio setup that can be used for lighting and render all manner of objects. We will go through the steps of lighting, shading, and render a toy robot model using the Arnold renderer. Arnold is an advanced Monte Carlo ray tracing renderer built for the demands of feature-length animation and visual effects movies. This is a beginners tutorial that introduces MAXtoA, a plug-in which allows you to use the Arnold renderer directly in Autodesk 3ds Max.
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