Toon Shader

Color Setting

Render Properties ‣ Color Management ‣ View Transform

bpy.context.scene.view_settings.view_transform = "Standard"

inner_faces_shader

Shader: inner_faces_shader

@tree
def inner_faces_shader(color: Color):
    """@shader"""

    shader1 = BSDF.Transparent()

    shader2 = BSDF.Emission(color)

    shader = shader1.mix(shader2, fac=shader1.geometry.backfacing)

    return shader

inner_faces_shader_with_hole

Shader: inner_faces_shader_with_hole

@tree
def inner_faces_shader_with_hole(color: Color, hole_y: Float = 0.5):
    """@shader"""

    shader1 = BSDF.Transparent()

    shader2 = BSDF.Emission(color)

    fac = shader1.geometry.backfacing + shader1.geometry.position.y.less_than(hole_y)

    shader = shader1.mix(shader2, fac=fac)

    return shader

ramped_diffuse_color

Shader: ramped_diffuse_color

@tree
def ramped_diffuse_color():
    """@shader"""

    color = BSDF.Diffuse().to_rgb().color

    factor = color.Float.float_curve(points=[(0, 0), (0.25, 0.2), (0.8, 0.85), (1, 1)])

    colors = []

    base_color = mathutils.Color(rgb(245, 120, 193))

    ramp_steps = 8

    for i in range(ramp_steps):

        base_color.v = (0.5 if i == 0 else i) / (ramp_steps - 1)

        colors.append(base_color.copy())

    # The upper for loop is equivalent to the following:
    colors = rgb(76, 32, 58), rgb(106, 48, 82), rgb(146, 69, 114), rgb(175, 84, 137),\
        rgb(199, 96, 156), rgb(220, 107, 173), rgb(238, 117, 188), rgb(255, 125, 201)

    color = factor.color_ramp_uniform(*colors, interpolation="CONSTANT")

    return color

Enable Color Decorator

Tip

To enable color decorator in vscode python editor, add this line to vscode config json:

{
    "[python]": {
        "editor.formatOnSave": true,
        "editor.defaultColorDecorators": true
    },
}

Then, there will be a color panel to select colors in vscode.

grandient_color

Shader: grandient_color

@tree
def grandient_color():
    """@shader"""

    fac = TextureCoord().uv.mapping(location=(0, 0.3, 0)).y

    color = fac.color_ramp_with_position(
        [(0.4, rgb(245, 120, 193)), (0.55, rgb(63, 50, 188))], interpolation="B_SPLINE"
    )

    return color

Material: toon

Material: toon

@tree
def toon():
    """@material"""

    color = ramped_diffuse_color()

    shader = BsdfPrincipled(base_color=color)

    return shader

bpy.data.materials["Toon"].blend_method = "CLIP"

Material: toon_gradient

Material: toon_gradient

@tree
def toon_gradient():
    """@material"""

    color = grandient_color()

    shader = BsdfPrincipled(base_color=color)

    return shader

Material: toon_inner

Material: toon_inner

@tree
def toon_inner():
    """@material"""

    color = ramped_diffuse_color()

    # shader = inner_faces_shader(color)

    shader = inner_faces_shader_with_hole(color)

    return shader

bpy.data.materials["Toon Inner"].blend_method = "CLIP"