feat: define moving source trajectories

schemas/scene.schema.json

@@ -31,6 +31,13 @@
       "type": "array", "prefixItems": [{ "type": "number" }, { "type": "number" }, { "type": "number" }],
       "items": false, "minItems": 3, "maxItems": 3
     },
+    "trajectoryKeyframe": {
+      "type": "object", "additionalProperties": false, "required": ["time", "position"],
+      "properties": {
+        "time": { "type": "number", "minimum": 0 },
+        "position": { "$ref": "#/$defs/position" }
+      }
+    },
     "image": {
       "type": "object", "additionalProperties": false,
       "required": ["assetId", "widthPixels", "heightPixels", "plane"],
@@ -80,6 +87,10 @@
       "properties": {
         "id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9._-]*$" },
         "name": { "type": "string", "minLength": 1, "maxLength": 120 }, "position": { "$ref": "#/$defs/position" },
+        "trajectory": {
+          "type": "array", "minItems": 2, "maxItems": 4096,
+          "items": { "$ref": "#/$defs/trajectoryKeyframe" }
+        },
         "gainDb": { "type": "number", "minimum": -120, "maximum": 24 }, "startTime": { "type": "number", "minimum": 0 },
         "duration": { "type": "number", "exclusiveMinimum": 0 }, "signal": { "$ref": "#/$defs/signal" }
       }