Hair rendering in Octane provides the most recent advancements in hair shading development. Octane leverages aspects of the Cinema 4D Hair object and material, and enhanced features to increase realism. The implementation is a combination of the following explained components:
- Cinema 4D Hair Object: Defines hair guides, hair surfaces used for hair generation, dynamics, and so on.
- Octane Hair Material: Describes the physical shading characteristics of the hair.
- Cinema 4D Hair Material: Specifies the look of the hair. OctaneRender uses the geometric portion of this material and hair shading properties that comes from the Octane Hair Material.
- Octane W Coordinate Node: This node allows for color shift along the hair shaft for a more natural look.
- Octane Object tag: Applied to the Cinema 4D Hair object, the Octane Object tag will enable Hair shading for Octane and is used to specify hair thickness and motion blur activation.
In the image below, the Octane Object tag is added after the Dragon’s hair setup is finished.
The Cinema 4D Hair Object is where hair is defined, groomed, and so on. The Hair object must have an Octane Object tag assigned to it, and properly set up to render hair (see here.) For motion blur, set the Octane Object tag motion blur setting to Transform/Vertex. Typically, you should not place the Hair object within a hierarchy used to transform the object receiving the hair. Doing that can result in double transforms, which will place the motion blur at an offset of the underlying object to which the hair is to be attached. When using deformers, such as Bend, to animate the hair-generating object, you must be sure that the Hair object is outside of the hierarchy in which the deformer is applied for the same reason.
For further information on how to use the Cinema 4D Hair object, you may refer to the Cinema 4D Help.
The Octane Hair material works together with the Cinema 4D Hair material and tag. It requires some of the settings from the Cinema 4D material to drive the final rendered result of the hair.
- Use the Cinema Hair material for the physical characteristics of the hair — Thickness, Frizz, Clump, and so on.
- Use the Octane Hair material for shading the hair itself.
The following illustration shows the Hair material tag. Note: Make sure that the name of the actual Cinema 4D Hair material is shown in the Material slot. Otherwise, hair may not render or export to ORBX (and thus, RNDR) correctly.
The next illustration shows the Cinema 4D Hair material. Octane will ignore or override the shading attributes. Instead, it uses the geometry attributes to shade the hair as expected.
The Octane Hair material is assigned to the hair object, along with the required Cinema 4D Hair material. The Octane Object tag will tie the two together for rendering.
Assign Standard Color
The simplest form of material assignment. Just create a material and assign it to a hair object.
Assign Octane Gradient
You can use Octane’s Gradient node to apply different colors to hair. In the example below, an octane gradient is assigned to the Diffuse Channel. If you prefer the Cinema gradient, it will work as well. There is an important note for you. That is the Random Color node will NOT work for hair.
Assign “W” Coordinate
The W coordinate allows color change along the hair strand. For details, refer to Textures W Coordinate.
As mentioned previously, you must apply the Octane Object tag to the Cinema 4D Hair object, with the Render as Hair toggle enabled. Without it, Hair will not render properly. You should also apply it to the object generating the Hair. Motion Blur must be set to Transform/Vertex.
Hair rendering in Octane can be previewed in the Live Viewer, as can the hair look development (Octane Hair Material) and lighting. However, please note that Live Viewer may not render motion properly. The reason is that it is intended for materials and lighting, not motion previewing. For motion previewing of hair, you should first use the Make Preview command (ALT-B) Animate > Make Preview, then render a low-sample preview to Picture Viewer. If the outcome is satisfactory, commit to the final render.
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Cinema 4D with Octane speed test videos produced by the iRender Team
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Reference source: docs.otoy.com