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Toon Material

This material creates toon shading, also called Cel-Shading (figure 1). In Octane, to properly use a Toon shader, it is necessary to use Toon lights, which will be covered in this section as well.

Figure 1: A scene rendered using Toon materials and lights.

The shader consists of numerous tabs that categorize the large set of options available for any particular shader type (figure 2). These categories of options are described below.

Figure 2: The Toon shader's tabs categories.

DiffuseAmount of diffusion, or the reflection of light photons at different angles from an uneven or granular surface. Used for dull, non-reflecting materials or mesh emitters.

The Diffuse channel works just as it does with the Diffuse materialUsed for dull, non-reflecting materials or mesh emitters.. The Float option changes the greyscale values of the material. In the Color section, the material color can be specified. Any greyscale, color, or procedural texture can be used in the Texture section. However, using the options in the Toon tab will typically produce better cel-shaded results.    

SpecularAmount of specular reflection, or the mirror-like reflection of light photons at the same angle. Used for transparent materials such as glass and water.

Used to create a specular highlight and set the strength on the material. However, using the options in the Toon tab will typically produce better cel-shaded results.    

Roughness

The roughness is used to adjust the size of the specular highlight. It is possible to get shading drawing irregularities by assigning noise or other texture types (figure 3).

Figure 3: Roughness with noise texture irregularities.

Toon

This tab provides additional parameters for deeper control over the toon-shaded surface.

Lighting Mode

• Toon Lights - This option uses Toon Lights in the scene to illuminate.
• Camera Light - With this option the lighting will be according to camera angle. It depends on the angle of view. Lighting is not realistic. 

Add Diffuse Toon Ramp

This option will apply a ramp to the diffuse component of the surface. It is recommend to set the Float value in the Diffuse tab to 1 and set the Color value to black. This will cancel out any contributions from the Diffuse tab. Toon ramp settings are classic gradient settings (figure 4).

Figure 4: Using a ramp to vary the diffuse color of the Toon material.

Add Specular Toon Ramp

This option will apply a ramp to the specular component of the surface (figure 5). 

Figure 5: Using a ramp to vary the specular color of the Toon material.

Outline Color

Specifies the outline color by assigning a texture. For an outline color in the black or white range, assign a FloatTexture to the texture channel. If a colored outline is needed, assign a RGB Spectrum to the texture channel.

Outline Thickness

Adjusts the outline thickness.

Toon Lights

Toon Lights should be used for Toon MaterialsA set of attributes or parameters that describe surface characteristics. to work effectively as they have been developed only for this material type. There are 2 different types of lights; Toon Point Light and Toon Directional Light.

Toon Point Light

This option adds a point light to the scene (figure 6).

Figure 6: The Toon Point Light.

Toon Directional Light

This adds a directional light to the scene. It is like the native sunlight object of Cinema 4D and is suitable for global lighting (figure 7). Rotation is more important than position.

Figure 7: The Toon Directional Light.

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