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{
  "type": "object",
  "properties": {
    "name": {
      "type": "string",
      "description": "Unique name of the body node"
    },
    "body_type": {
      "type": "string",
      "enum": [
        "static",
        "rigid",
        "character",
        "area"
      ],
      "default": "static",
      "description": "static = immovable level geometry; rigid = simulated, falls and is pushed; character = script-driven; area = trigger volume that detects overlap without blocking"
    },
    "parent_path": {
      "type": "string",
      "default": ".",
      "description": "Parent node path (defaults to root .)"
    },
    "mesh_type": {
      "type": "string",
      "enum": [
        "box",
        "sphere",
        "capsule",
        "cylinder",
        "plane"
      ],
      "default": "box",
      "description": "Shape of both the collider and the visible mesh. prism and torus are not offered: they have no analytic collision shape."
    },
    "size": {
      "type": "array",
      "items": {
        "type": "number"
      },
      "description": "Vector3 dimensions [x, y, z] for box; [width, depth] for plane"
    },
    "radius": {
      "type": "number",
      "description": "Radius for sphere/capsule/cylinder"
    },
    "height": {
      "type": "number",
      "description": "Height for capsule/cylinder"
    },
    "thickness": {
      "type": "number",
      "default": 0.2,
      "description": "Slab thickness for a plane floor. A zero-thickness floor lets fast bodies tunnel through it."
    },
    "mass": {
      "type": "number",
      "default": 1,
      "description": "Mass, for body_type rigid"
    },
    "visible_mesh": {
      "type": "boolean",
      "default": true,
      "description": "Set false for an invisible collider or trigger volume"
    },
    "position": {
      "type": "array",
      "items": {
        "type": "number"
      },
      "description": "3D position coordinates [X, Y, Z]"
    },
    "rotation": {
      "type": "array",
      "items": {
        "type": "number"
      },
      "description": "3D rotation in degrees [Pitch, Yaw, Roll]"
    },
    "scale": {
      "type": "array",
      "items": {
        "type": "number"
      },
      "description": "3D scale factors [sx, sy, sz]"
    },
    "material": {
      "type": "object",
      "properties": {
        "albedo_color": {
          "type": "string",
          "description": "Hex color (e.g. #538dda) or rgba string"
        },
        "metallic": {
          "type": "number",
          "minimum": 0,
          "maximum": 1
        },
        "roughness": {
          "type": "number",
          "minimum": 0,
          "maximum": 1
        },
        "emission": {
          "type": "string",
          "description": "Hex emissive color"
        },
        "emission_energy": {
          "type": "number",
          "description": "Emissive energy multiplier"
        }
      },
      "additionalProperties": false
    }
  },
  "required": [
    "name"
  ],
  "additionalProperties": false
}