This short and simple 'making of' tutorial covers how to use the toon shader to create a sketch style as in the above image. The scene is lit using a skydome_light and the filter has been set to contour for toon_edge rendering.

Default Toon Shader

• Assign a toon shader to the model. This is how it looks using the default settings.

Edge Angle Threshold

• Let's focus on the edge parameter only for now. Reduce base_weight and specular_weight to 0. Increase emission_weight to 1.

• Reduce the edge_angle_threshold to around 20 to add more detail.

Normal_type: shading_normal	Normal_type: geometric_normal

Specular and Emission

• Now let's focus on the rest of the shading. Increase specular_weight to around 0.6 and emission_weight to around 0.3 with a gray emission_color.

Mask Color

• It's getting there. Now let's try adding more detail to the edge shading. Create a utility shader and connect it to the edge_mask_color of the toon shader. Change the shade_mode of the utility shader to metal and lower the roughness to around 0.01. However, this looks too much now and so we need to reduce the effect.

Edge Width

• Decrease the edge_width to around 0.5 and there we have it!

Try experimenting with different shade_modes of the utility shader on your own models to get different shading styles for the edge parameter.