Cinema 4D offers numerous output formats and options. The Multi-Pass rendering and RLE/RPF bitmap format make it possible to edit rendered images in a wide variety of ways and with a variety of applications, including Photoshop and BodyPaint 3D in which Multi-Pass layers can be used.
The tried and true TIF format (Tagged Image File), for example, can contain an alpha mask, which in turn can be used to mask objects.
You can also edit or embed other image-specific information such as shadows, lighting, transparent surfaces and more. This is made possible by the RLA and RPF output formats. The Photoshop PSD format can also be used to include this information. An 8-bit channel is added to the normal image information which, for example, only includes the image's shaded regions, which in turn can be used as effects masks in such programs as Photoshop or Combustion.
This makes adding or accentuating shading, brightening of illuminated image regions or complex compositing for animation possible in an efficient and professional manner. In addition, separate channels can be created for different light sources, which allows for very precise control and modification of lighting conditions - and this in a rendered image!
Working with these additional channels does not demand that much more time. For example, Multi-Pass rendering makes it possible to render a scene with two or more different lighting scenarios. When the image or animation is renders, all you have to do is disable the layer with the lighting scenario you don't want to keep. Reflections, specular highlights and parts of the ambient illumination you create for the scene can also be disabled, added or otherwise manipulated - for either single images or animations. This can eliminate the need for numerous render tests, thereby saving you a lot of time.
Scenes from previous versions of Cinema 4D that include simulated GI can now be viewed with real GI and both versions can be compared in a single image. Products can be illuminated with multiple lighting scenarios and rendered simultaneously. A single image can contain multiple layers, each with a different lighting scenario. The channels that are not needed can then be disabled or removed in an image editing program (e.g., BodyPaint 3D).
Video effects can be limited or applied to specific layers. This list of possibilities is great and offers you a wide variety of methods for editing images and animations in addition to the ones mentioned above.
The settings described on this page are global and require further modification for specific objects.
How to use Multi-Pass
So, how do you define which channels should be rendered? There are two ways in which to do this:
The items in the Channels drop-down list are:
Adds to the selection list all image layers that form the composite image. These layers are: Ambient, Diffuse, Shadow, Reflection/Specular (both in the Reflectance channel), Refraction, Atmosphere and Atmosphere (Multiply). All the other image layers (see The layers below) may be used for visual effects but are not actually part of the composite image.
If you have the Advanced Render module installed, Global illumination and Photon Caustics layers are also added to the selection list by this command.
Selects all image and material layers simultaneously.
Selects all channels that contain the prefix, Material. These are the scene’s material channels. The Multi-Pass channels contain information regarding the scene’s corresponding material channel (e.g., the Material Color Pass channel contains the material color for every object in the scene).
The following material layers can be selected: Color, Diffusion, Luminance, Transparency, Reflection, Environment, Specular, Specular Color, Normals and UVW.
Channels can be selected using the mouse (multiple selections in combination with the Shift or
This command deletes all selected channels.
Empties the selection list.
Creates a blended layer. For example, you can blend Shadow, Global illumination and Photon Caustics as a single layer. After choosing this command, a dialog opens. Enable the channels you want to blend and click OK.
Enabling this channel will open the following dialog:
This creates a mask layer for objects that use a specified ID number in their Compositing tags. After choosing this command, the Object Buffer dialog open. Enter the desired ID number and click OK.
The cube’s Compositing tag was assigned the ID 1 and the sphere’s Compositing tag was assigned two IDs: 1 and 2. To the right are two alpha channels that were created as a result of two object channels (the first with Group ID 1, the second with Group ID 2) being defined in the Multi-Pass settings.
Contains the image information as we know it. Red, green and blue plus an alpha mask, depending on the bitmap used. The Save settings define whether or not the alpha mask should be calculated and made part of the image.
This channel shows on the one hand how regions of the image illuminated by ambient light are affected by an
Renders the scene’s diffuse lighting. The illumination is rendered without specular highlights and reflexion, and based solely on shading (shadows but no explicit shadows!).
Displays the areas of the image in which specular highlights appear.
Note also Specular Multi-Pass settings.
Displays the shaded areas of the image.
Displays all reflective surfaces.
Separate Specular Multi-Pass settings are also available.
Creates a channel that displays all transparent surfaces, including refraction, and the objects that lie behind these surfaces.
If GI is selected and set up accordingly in the Render Settings the effects of this channel and those of the dispersed light will be displayed.
If enabled for Multi-Pass rendering, the typical refraction reflexes that are created when light passes through a transparent or reflective surface can be saved separately to this layer.
All volumetric image elements will be saved in this channel. These can include:
Other channels with the prefix, Material, serve to create additional channels for a given material channel relating to the entire scene. These channels are irrelevant for normal use of Cinema 4D.
This channel displays the distribution of brightness (incl. shadows) throughout the scene as if all objects were white. Only the dispersion of light on the objects’ surfaces will be displayed.
This option lets you create depth maps (grayscale images that define Project elements in relation to their distance from the camera’s focal distance). Objects on the focal plane (defined using Focus Distance) will be colored black. The farther away to the focal plane an object lies, the lighter it will be - up to and including white. What is this good for? Using depth maps, third-party applications can quickly calculate a fairly accurate depth of field.
A focal plane can be defined in the camera settings (DOF Map Front Blur), in which front and back regions can be defined in which a black-to-white grayscale gradient can be defined.
A physically correct depth of field can be calculated using the Physical Renderer.
The Post Effects channel makes it possible to render a variety of post effects (PyroCluster, lens effects, vector motion blur, highlights, glow effects, glow) as separate passes.
Not to be confused with normal maps, these normal components are rendered as RGB (X=red, Y=green, Z=blue) without antialiasing. This is designed for compatibility with other applications.
This channel renders objects (without antialiasing), according to their UVW coordinates, in a green-red-blue gradient: U=red, V=green, W=blue. Applications such as After Effects can easily work with these files.
Motion Vector lets you output color-coded motion vectors. Depending on the direction of movement, each object pixel will be colored accordingly red=X; green=Y; blue is not used). Third party applications, such as ReelSmart Motion Blur for example, can calculate motion blur based on these colors. The maximum length can be defined using the Motion Scale setting (Render Settings … / Options page).
You can generate an Ambient Occlusion pass for the entire scene, in accordance with the Ambient Occlusion options in the Render Settings.
Use Separate Lights to choose which light sources have their own separate layers.
The following options are available:
No separate layers.
Each light has separate layers.
Separate layers for all lights whose Separate Pass option is enabled (General tab).
Use Mode to control how the diffuse, specular and shadow information is layered for each light source that has its own layers.
Adds one blended layer for Diffuse, Specular and Shadow.
Adds one blended layer for Diffuse and Specular, and one layer for Shadow.
Adds one Diffuse layer, one Specular layer and one Shadow layer.
When rendering Multi-Passes with shadows switched on, slight artifacts such as bright lines may appear at object edges due to antialiasing. To prevent these artifacts from appearing, enable this option.