Agent Skills
› EL4CTEO/blender-skills
› blender-stylized-npr
blender-stylized-npr
GitHubBlender NPR/风格化渲染技能，提供卡通着色、轮廓线及引擎导出配置。通过脚本自动化处理材质、光照与法线，支持动画、漫画等视觉风格制作。
Trigger Scenarios
需要为3D模型应用卡通或Cel-shading风格
生成用于游戏引擎的轮廓线和法线数据
批量设置NPR材质的光照和阴影参数
Install
npx skills add EL4CTEO/blender-skills --skill blender-stylized-npr -g -y
SKILL.md
Frontmatter
{
"name": "blender-stylized-npr",
"license": "MIT",
"metadata": {
"author": "blender-agent-skills",
"version": "1.2.0"
},
"description": "Stylized \/ NPR looks in Blender 5.3 - toon and cel shading (bands, shadow tint, rim, hard specular), anime faces with custom normals, inverted-hull outlines with smoothed outline normals for game engines, Line Art and Freestyle lines, Grease Pencil drawing, unlit export. Use for anime, cartoon, comic, cel-shaded or outlined styles."
}
Stylized / NPR
The execution model is in blender-core. Base colors still come from blender-pbr-materials/blender-texturing. This skill replaces how they're lit.
One call each
scripts/toon_setup.py -- --objects Hero Sword --bands 2 --rim 0.4 --outline 0.004
scripts/toon_setup.py -- --objects Hero --bands 3 --spec 0.3 --smooth-normals # + engine outline data
scripts/toon_setup.py -- --objects Hero --lighting scene # EEVEE: all lights + cast shadows
scripts/toon_setup.py -- --line-art --outline 0 # scene-wide Line Art
scripts/toon_setup.py -- --objects Hero Sword --remove --line-art # exact restore
toon_setup.py
- Inserts an
NPR_Toonemission group between each material's Principled base color and the output, and records the original surface link for--remove. Re-running updates values in place. --lighting key(default, Cycles + EEVEE): shading = N·L against one sun (--light;NPR_Keyis created if there's none). Drivers follow the sun's rotation, so rotate the sun to art-direct the shadow shape. This is how engine toon shaders work, and the look matches after export.--lighting scene: Shader to RGB on a white diffuse, so every light and cast shadow shapes the bands. EEVEE only. Measured: in Cycles, Shader to RGB returns a constant regardless of light (identical render at 0, 3 and 10 W/m² sun).- Bands: 2 (lit/shadow, classic anime) or 3 (adds a mid band 0.45 above
--threshold).--softness(0.02) is the half-width of the band edge, so 0 aliases.--shadow-tintmultiplies the base color: use cool and saturated (0.6, 0.55, 0.75), never grey/black, because grey shadows read as dirty. --rim(0–1) adds a lit-side rim, and--spec(0–1) a hard Blinn highlight disc (0.2–0.4 for hair/metal, 0 for skin).- Sets view transform Standard: AgX/Filmic desaturate and compress flat colors, so the albedo you pick is the pixel you get only under Standard. The original is restored on
--remove.
Outlines (pros use several at once)
| Method | Where it works | Notes |
|---|---|---|
Inverted hull (--outline, m) |
Cycles, EEVEE, engines | Solidify outward, flipped normals, outline slot, Backfacing→transparent. Width 2–6 mm on a 1.75 m character. --outline-group = vertex group for width (taper toward tips, 0 inside the mouth) |
--smooth-normals |
engine outline shaders | NPR_OutlineNormal corner color = position-welded normal in tangent space (0.5 + 0.5n). Hard edges/UV splits no longer open gaps. Decode n = TBN·(c·2−1) |
Line Art (--line-art, Grease Pencil) |
renders | contour + crease + intersection from the camera. Needs a scene camera. --line-radius (m) |
| Freestyle | renders | scene.render.use_freestyle = True, line_thickness px. Slowest, most options |
Known hull limits: lines at intersections and inner creases are missing (use Line Art for those in renders), and hard-edged meshes split the hull. In Blender, merge by distance before the Solidify. In engines, use --smooth-normals. |
Anime faces and hair
- Face shadows from real normals look blotchy. Transfer custom normals from a simple ellipsoid proxy: a Data Transfer modifier with
use_loop_data=True,data_types_loops={'CUSTOM_NORMAL'},loop_mapping='POLYINTERP_NEAREST'(no auto smooth needed since 4.1), masked by a face vertex group. Engines import the custom normals (FBX/glTF export normals). - For a stylized nose/cheek shadow, many games use an SDF face shadow texture sampled with the light angle in-engine. Author it as a grayscale threshold map, not in the node tree.
- Hair: a strong
--specplus a hand-painted highlight band ("angel ring") in the base color texture.
Grease Pencil (5.x API)
gp = bpy.data.grease_pencils.new("Ink"); ob = bpy.data.objects.new("Ink", gp); scene.collection.objects.link(ob)
mat = bpy.data.materials.new("Ink"); bpy.data.materials.create_gpencil_data(mat); gp.materials.append(mat)
drawing = gp.layers.new("Lines").frames.new(1).drawing
drawing.add_strokes([3]); s = drawing.strokes[0]
for i, p in enumerate(s.points): p.position, p.radius = (i * 0.5, 0, 0), 0.01 # radius in m
Strokes expose cyclic, material_index, fill_id, hide_stroke. Raw attributes: drawing.attributes (position, radius). GreasePencilv3/grease_pencils_v3 are gone (5.0). 5.2 Line Art can emit fill strokes (fill_strokes).
To game engines
Node toon shading doesn't export. Export the base color textures and rebuild the toon ramp in the engine (UE material/post-process, Unity URP toon shader, Godot ShaderMaterial), driven by the same sun direction. Ship the hull as a second material slot (apply the modifier), or as NPR_OutlineNormal for a shader outline pass.
For flat, unlit assets in glTF, use a Background shader, or Light Path Is Camera Ray mixing Transparent→Background: both export as KHR_materials_unlit. Emission exports as emissive on a black base, not unlit (measured).
Gotchas
- Apply scale before
--outline: Solidify thickness is in object space. - Bloom and AO fight the flat look. Keep the world dim and uniform, and use one key light plus maybe a rim light.
--lighting scenebands shift with light energy (luminance 0.3 ≈ threshold 0). Raise/lower--thresholdinstead of the light power.
Version History
- b1b21df Current 2026-11-15 13:20
