feat: add multichan example

Author: seankmartin

examples/serve_default_dir.py

@@ -6,6 +6,7 @@
 from neuroglancer_utils.create_datasets.create_allen_multi import create_allen_multi
 from neuroglancer_utils.create_datasets.create_cdf_example import create_cdf_example
 from neuroglancer_utils.create_datasets.create_border_data import create_border_example
+from neuroglancer_utils.create_datasets.create_multic import create_multi
 from neuroglancer_utils.local_server import create_server
 
 create_cube()
@@ -14,5 +15,6 @@
 create_allen_multi()
 create_cdf_example()
 create_border_example()
+create_multi()
 create_server(directory="datasets")
 input("Press enter to continue")

neuroglancer_utils/create_datasets/create_multic.py

@@ -0,0 +1,19 @@
+from cloudvolume import CloudVolume
+import numpy as np
+
+
+def create_multi(output_path="file://datasets/multic"):
+    generator = np.random.default_rng(0)
+    data = generator.random((40, 30, 20, 8)) * 10000
+    CloudVolume.from_numpy(
+        data.astype(np.float32),
+        vol_path=output_path,
+        resolution=(40, 40, 40),
+        chunk_size=(10, 10, 10),
+        layer_type="image",
+        progress=True,
+        compress=False,
+    )
+
+if __name__ == "__main__":
+    create_multi()