Render Window — hero
camera + framing set up by the AI contestant
3D Viewport — red-ball User Persp
LOADING 3D VIEW
$0.02Cost
75sDuration
6Tool calls
7Turns
Blender 5.1.0MCP 1.22026-07-15
Tokens: 40770/2508Vision: ✗Votes W-L-T: 0-0-0DONE ✓
B-BENCH — TRANSCRIPT Z.AI / GLM 5.2 · r1 · 2026-07-15
RUN LOG — red-ball · Z.AI / GLM 5.2 · r1 · ok
SYSTEM PROMPTthe control — every model on this task got these instructions
PROMPTblender-bench v6HARNESSraw-v1
SHOW FULL PROMPT · 1104 chars
You are participating in Blender-Bench, a public benchmark where AI models complete the same Blender task. Your result will be compared head-to-head with another model. Anyone on the internet can vote, based only on the published visual outputs they can inspect: the interactive 3D scene and rendered presentation. Complete the request as well as you can. The benchmark does not prescribe a workflow or visual style; use whichever Blender techniques you consider appropriate. Make the important requirements evident in the published result, save a complete scene, and present the work clearly in every requested output. ## Harness Instructions You are operating Blender through the provided tools. The scene starts empty. Build what the user's prompt asks for in the current scene. Work step by step and verify your own work. Before you finish, set up a camera and lighting to frame a single, well-composed presentation image of your result — position and aim the camera, and add or adjust lights so the subject reads clearly. When you are finished, reply with the single word DONE and no tool calls.
--TASK red-ball: ## Task
Complete the following Blender task:
<task>
A red sphere of 1 meter diameter resting on a white ground plane — touching it
exactly, neither floating nor sunk. Smooth shading, a plain red material on the
ball, plain white on the floor.
The floor is the sphere, the color, and the contact. The ceiling is presentation:
a soft believable shadow under the ball, a hint of glossiness that catc…
57:21>>get_scene_info({"user_prompt":"A red sphere of 1 meter diameter resting on a white ground plane, smooth shading, soft shadow, clean presentation framing."})
57:21<<{
"name": "Scene",
"object_count": 0,
"objects": [],
"materials_count": 2
}
57:36>>execute_blender_code({"user_prompt":"A red sphere of 1 meter diameter resting on a white ground plane","code":"\nimport bpy\nimport math\n\n# --- Clean slate ---\nbpy.ops.object.select_all(action='SELECT')\nbpy.ops.object.delete(use_global=False)\nfor m in list(bpy.data.materials):\n bpy.data.materials.remove(m)\nfor mesh in list(bpy.data.meshes):\n bpy.data.meshes.remove(mesh)\nfor light in list(bpy.data.lights…)
57:36<<Code executed successfully: Sphere location: <Vector (0.0000, 0.0000, 0.5000)>
Sphere bounding box: [(-0.49999985098838806, -0.49999988079071045, -0.5), (-0.49999985098838806, -0.49999988079071045, 0.5), (-0.49999985098838806, 0.5, 0.5), (-0.49999985098838806, 0.5, -0.5), (0.4999999403953552, -0.49999988079071045, -0.5), (0.4999999403953552, -0.49999988079071045, 0.5), (0.4999999403953552, 0.5, 0.…
57:40>>execute_blender_code({"code":"\nimport bpy, math\n\n# --- Lighting: key light (sun) for nice shadow + fill light ---\nbpy.ops.object.light_add(type='SUN', location=(3, -3, 6))\nkey = bpy.context.active_object\nkey.name = \"KeyLight\"\nkey.data.energy = 4.0\nkey.data.angle = math.radians(15) # soft shadow\nkey.rotation_euler = (math.radians(45), math.radians(10), math.radians(35))\n\n# Area light as fill\nbpy.ops.obj…)
57:40<<Code executed successfully: Lighting and camera set.
57:45>>execute_blender_code({"code":"\nimport bpy, math\n\n# Verify everything is in place\nprint(\"=== Scene Objects ===\")\nfor obj in bpy.context.scene.objects:\n print(f\" {obj.name}: type={obj.type}, loc={tuple(round(v,3) for v in obj.location)}\")\n \nprint(\"\\n=== Sphere Details ===\")\nball = bpy.data.objects.get(\"RedBall\")\nif ball:\n print(f\" Location Z = {ball.location.z:.4f} (radius=0.5, so bottom …)
57:45<<Error executing code: Communication error with Blender: Code execution error: 'Mesh' object has no attribute 'use_auto_smooth'
57:53>>execute_blender_code({"code":"\nimport bpy, math\n\n# Verify everything is in place\nprint(\"=== Scene Objects ===\")\nfor obj in bpy.context.scene.objects:\n print(f\" {obj.name}: type={obj.type}, loc={tuple(round(v,3) for v in obj.location)}\")\n \nprint(\"\\n=== Sphere Details ===\")\nball = bpy.data.objects.get(\"RedBall\")\nif ball:\n print(f\" Location Z = {ball.location.z:.4f} (radius=0.5, so bottom …)
57:53<<Code executed successfully: === Scene Objects ===
Ground: type=MESH, loc=(0.0, 0.0, 0.0)
RedBall: type=MESH, loc=(0.0, 0.0, 0.5)
KeyLight: type=LIGHT, loc=(3.0, -3.0, 6.0)
FillLight: type=LIGHT, loc=(-2.5, 1.5, 2.0)
PresentationCam: type=CAMERA, loc=(2.2, -2.2, 1.4)
=== Sphere Details ===
Location Z = 0.5000 (radius=0.5, so bottom = 0.0000)
All polygons smooth: True
=== Floor Detai…
58:02>>execute_blender_code({"code":"\nimport bpy\n\n# Render the presentation image\nbpy.context.scene.render.filepath = \"/tmp/blender_bench_red_ball.png\"\nbpy.ops.render.render(write_still=True)\nprint(\"Render saved to /tmp/blender_bench_red_ball.png\")\n","user_prompt":"Render presentation image of the red ball on white floor"})
58:13<<Code executed successfully: Render saved to /tmp/blender_bench_red_ball.png
58:23ai>Everything is verified and rendered. Here's a summary of what was built:
**Geometry**
- **Red sphere** — UV sphere, radius 0.5 m (1 m diameter), centered at Z = 0.5 so its bottom is exactly at Z = 0.0 — touching the floor perfectly, neither floating nor sunk. 64 segments × 32 rings for smoothness, all polygons set to smooth shading.
- **Ground plane** — 10 m plane at Z = 0.0.
**Materials**
- **B…
58:23--status: ok · DONE declared
>
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