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"id": "single-software-execution--cli--blender--task-06--ubuntu",
"snapshot": "Blender-4.2.3",
"instruction": "Field-Driven Instance Rotation. `/home/user/Desktop/scene.blend` contains two mesh objects: - `Globe`: a UV sphere at the origin, radius 1.5, 32 segments * 16 rings. Launch Blender by running `blender` from a terminal. On this machine, use `/opt/blender/blender` for Blender command-line or background runs when working on `scene.blend`.\n\nNo modifiers. - `Spike`: a small cone (radius = 0.05, depth = 0.3) whose base sits at its own origin (local z = 0) and whose tip is at local z = +0.3. When instanced with its local +Z axis aligned to a surface normal, the spike points outward from the surface. Scene units are meters. Add a Geometry Nodes modifier on `Globe` that scatters approximately 500 `Spike` instances across the sphere's surface. Every spike's local +Z axis must align to the surface normal at its base, and each instance must receive a small per-instance random twist (+/- 5 degrees) AROUND that normal, seeded by `Seed = 42` so the result is deterministic. ## Required node graph 1. `Group Input` (Geometry) -> `Distribute Points on Faces` in POISSON_DISK mode with `Seed = 42`. Pick `Distance Min` / `Density Max` so the resulting instance count lands near 500 (anywhere in [450, 550] is acceptable). 2. Use `Align Euler to Vector` with `axis = 'Z'`, `Factor = 1.0`, and `Vector` wired from the distribute node's `Normal` output. This rotation aligns each spike's local +Z to the surface normal. 3. Use `Random Value` (data type FLOAT) with `Min = -5 deg (in radians)`, `Max = +5 deg (in radians)`, `Seed = 42` to produce a per-instance tilt angle. 4. Use `Rotate Euler` in AXIS_ANGLE mode to tilt the aligned rotation around the normal by that random angle. (Rotating around the normal does not change the +Z direction.) 5. `Instance on Points` with `Points` = distribute output, `Instance` = `Object Info(Spike)` geometry, and `Rotation` wired from the Rotate Euler output. 6. `Group Output` (Geometry) = Instance on Points output. Do NOT realize the instances - leave them as true instances so the depsgraph exposes their transforms. Save your result as `/home/user/Desktop/answer.blend`. The GN modifier must remain on `Globe` - do not apply it. ## Requirements 1. `/home/user/Desktop/answer.blend` exists and opens. 2. `Globe` exists as a mesh, and `Spike` exists as a mesh. 3. `Globe` has exactly one modifier of type NODES with a non-empty node group. 4. The node tree contains a `GeometryNodeDistributePointsOnFaces` node whose `Seed` resolves to 42. 5. The node tree contains a `GeometryNodeInstanceOnPoints` node. 6. The node tree contains a `FunctionNodeAlignEulerToVector` node with `axis = 'Z'`. 7. Iterating `bpy.context.evaluated_depsgraph_get().object_instances` with `obj_inst.parent.original == Globe` and `obj_inst.is_instance == True` yields between 450 and 550 instances. 8. For every instance, the angle between the instance's world +Z axis and the face normal of the nearest Globe face is at most 5 degrees. 9. Determinism: re-evaluating the depsgraph yields bit-exact identical instance positions (max difference below 1e-5 m).",
"source": "https://docs.blender.org/manual/en/4.1/; https://docs.blender.org/api/4.1/; https://developer.blender.org/docs/release_notes/4.1/; https://www.loc.gov/preservation/digital/formats/fdd/fdd000507.shtml",
"config": [
{
"type": "upload_file",
"parameters": {
"files": [
{
"local_path": "task-06/init_file/scene.blend",
"path": "/home/user/Desktop/scene.blend"
}
]
}
}
],
"trajectory": "trajectories/",
"related_apps": [
"blender"
],
"artifact_paths": [
"/home/user/Desktop/answer.blend"
],
"evaluator": {
"postconfig": [
{
"type": "upload_file",
"parameters": {
"files": [
{
"local_path": "task-06/eval.py",
"path": "/home/user/Desktop/eval.py"
}
]
}
}
],
"func": "exact_match",
"result": {
"type": "vm_command_line",
"command": "python3 /home/user/Desktop/eval.py",
"shell": "true"
},
"expected": {
"type": "rule",
"rules": {
"expected": "True\n"
}
}
},
"proxy": false,
"fixed_ip": false,
"possibility_of_env_change": "low"
}
|