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Chapter 6: Rendering. This chapter is all about rendering with Arnold, first we discover the powerful IPR or Interactive Preview Render window. Then we talk about GPU Rendering in Arnold and clear all the misconceptions about it, like why sometimes it takes so much time before GPU rendering starts and so on, Arnold’s implementation of GPU rendering is quite good as you can switch between.

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 C4DtoA, a plug-in which allows you to use the Arnold renderer directly in C4D.In this tutorial, we will cover how to build a simple photographic lighting studio setup that can be used for lighting and rendering all manner of objects. We will go through the steps of lighting, shading and rendering a robot model using the Arnold renderer. We will use Arnold's proprietary lights to achieve a physically accurate, photo-realistic lighting setup.

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We will use the Standard Surface shader to shade the robot and give it a metallic finish. The Standard Surface shader is a multi-purpose shader capable of producing all types of materials, from simple plastic to car paint or skin. The Standard Surface shader is very powerful, and allows a large number of different sorts of materials to be created, but can be somewhat daunting at first.Due to a large number of controls, the Standard Surface shader is split up into several groups such as Base, Specular, Sub-Surface Scattering etc. We will need to adjust the Base and Specular attributes to get a believable brushed metal effect.

We will also look at some of Arnold's camera lens options to produce realistic, physically accurate depth of field. Lastly, we will look at how to optimize render settings and eliminate any noise that may appear in the render. The estimated time it will take to complete this tutorial should be no more than 30 minutes.

Scene Setup

Start off by opening the start scene. In the scene, you should see the robot model and a simple studio backdrop model.

Now we want to light our studio scene. Start off by creating three Area lights. This can be found under Plugins > C4DtoA -> Arnold Light -> quad_light.

Position one light on either side and another in the center, above the robot. Rotate them so that they are pointing inwards towards the robot as indicated in the screengrab below.

Light Settings

The scene may appear dark when it is rendered. We, therefore, need to increase the exposure of the lights. Under the Arnold attributes, increase the Exposure to around 11 for each light.

We can change the color of the lights by enabling Color Temperature. Select the right light and enable the Color Temperature within its Arnold attributes. Leave it at its default temperature value of 6500. This will give a cool blue feel to the light. Select the light on the left and do the same, except change the Color Temperature to a warmer color, something like 4000.

Light Samples

You may notice some noise in the shadows from the Quad lights. This is because the light's samples are set to 1 by default. To reduce the noise, try increasing the light samples to 3. This setting can be found in the Arnold attributes within each light. Light samples control the quality of the noise in the soft shadows and direct specular highlight. The higher the number of samples, the lower the noise, and the longer it takes to render.

Shading

Create a Standard Surface shader from the Material Manager menu Create > Arnold > Surface > standard_surface.
Assign the material to the robot.
To turn it into a brushed metal material we will change the following settings. Lower the Base Weight to 0.3 and change the Base Color to a mid-grey color. The Specular Roughness controls the glossiness of the specular reflections. The lower the value, the sharper the reflection. Set it to a value of 0.467. Also, change the Specular IOR to around 4.

Camera Depth of Field

We can use C4D's native camera to render the scene using depth of field. Create a camera and rename it to 'RenderCam'. Create a locator and position it where you want the focus to be on the robot (e.g., head). Drag the locator onto the 'Focus Object' field in the RenderCam.
Add an Arnold Tag tag to the RenderCam. Enable 'Enable DOF.' You won't notice any difference in the render unless you increase the 'Aperture Size.' When you increase the 'Aperture Size' you should see that the robot's head is in the camera focus. Try a low value, such 0.5 (this value is scene scale dependent).

^{_{A null object used as Focus Object (left). Cameras Arnold DOF Parameters (right).}}

Rendering

Rendering the scene using the default Camera (AA) setting of 3 is good enough for test renderings. 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.
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. Increasing the global Specular value to 3 helps resolve this noise and to create a cleaner looking render.

Sampling and noise

Noise nearly always comes from insufficient sampling, but increasing sampling for the wrong rays can make the render times increase without helping to remove the noise. The aim is to allocate rays as effectively as possible to minimize the noise in the most efficient manner. So if the Camera samples have to be increased to remove DOF noise, the other settings must be lowered to keep render times manageable. However, if DOF or motion blur is not a concern, then increasing Camera samples would fix all noise elsewhere but would also slow render times from the unnecessary rays.

There are two denoising options available for rendering with Arnold:

The OptiX™ Denoiser(based on Nvidia AI technology), is integrated into Arnold for use with IPR and look dev. It can be applied to any AOV. The OptiX denoiser is meant to be used during IPR (so that you get a very quickly denoised image as you're moving the camera and making other adjustments). For this reason, it is not suitable for final frame rendering or animations as it can cause flickering between frames (see below).

The Arnold Denoisercan be run from a dedicated UI, exposed in the Denoiser. It favors quality over speed and is, therefore, more suitable for high-qualityfinal frame denoising and animation sequences. To use the Arnold denoiser, you will need to render images out first via the Arnold EXR driver with variance AOVs enabled. It is also available as a stand-alone program (noice.exe).