add more image tests

examples/amr_spherical_volume_rendering.py

@@ -18,8 +18,6 @@
     "ew_hemi": np.array([[0.1, 1.0], [0.0, np.pi], [0.0, np.pi]]),
     "quadrant_shell": np.array([[0.6, 1.0], [0.0, np.pi / 2], [0.0, np.pi / 2]]),
 }
-sz = (256, 256, 256)
-fake_data = {"density": np.random.random(sz)}
 
 if __name__ == "__main__":
 
@@ -40,9 +38,15 @@
     parser.add_argument(
         "-np", "--nprocs", default=64, help="number of grids to decompose domain to"
     )
+    parser.add_argument(
+        "-sz", "--size", default=256, help="dimensions, will be (size, size size)"
+    )
 
     args = parser.parse_args()
 
+    sz = (int(args.size),) * 3
+    fake_data = {"density": np.random.random(sz)}
+
     field = str(args.field).split(",")
     if len(field) == 1:
         field = ("gas", str(field).strip())
@@ -117,5 +121,7 @@ def _r_rev(field, data):
     rc = yt_idv.render_context(height=800, width=800, gui=True)
     sg = rc.add_scene(ds, field, no_ghost=True)
     rc.scene.components[0].sample_factor = 20.0
+    rc.scene.components[0].cmap_log = False
+    rc.scene.components[0]._reset_cmap_bounds()
 
     rc.run()

yt_idv/tests/test_spherical_vol_rendering.py

@@ -6,31 +6,87 @@
 
 
 @pytest.fixture()
-def osmesa_fake_spherical():
-    """Return an OSMesa context that has a "fake" AMR dataset added, with "radius"
-    as the field.
-    """
+def osmesa_empty_rc():
+    """yield an OSMesa empy context then destroy"""
+
+    rc = yt_idv.render_context("osmesa", width=1024, height=1024)
+    yield rc
+    rc.osmesa.OSMesaDestroyContext(rc.context)
+
+
+bbox_options = {
+    "partial": {
+        "bbox": np.array([[0.5, 1.0], [0.0, np.pi / 3], [np.pi / 4, np.pi / 2]]),
+        "field": ("index", "r"),
+        "camera_position": [-0.5, -1, 2.5],
+    },
+    "whole": {
+        "bbox": np.array([[0.0, 1.0], [0.0, 2 * np.pi], [0, np.pi]]),
+        "field": ("index", "phi"),
+        "camera_position": [0.5, 0.5, 2],
+    },
+    "quadrant_shell": {
+        "bbox": np.array([[0.6, 1.0], [0.0, np.pi / 2], [0.0, np.pi / 2]]),
+        "field": ("index", "theta"),
+    },
+}
+
+
+@pytest.mark.parametrize("bbox_option", bbox_options.keys())
+def test_spherical_bounds(osmesa_empty_rc, image_store, bbox_option):
 
     sz = (32, 32, 32)
     fake_data = {"density": np.random.random(sz)}
 
-    bbox = np.array([[0.1, 1.0], [0.0, 2 * np.pi], [0, np.pi]])
+    bbox = bbox_options[bbox_option]["bbox"]
 
     ds = yt.load_uniform_grid(
         fake_data,
         sz,
         bbox=bbox,
-        nprocs=1,
+        nprocs=8,
+        geometry=("spherical", ("r", "phi", "theta")),
+        length_unit="m",
+    )
+    dd = ds.all_data()
+
+    field = bbox_options[bbox_option]["field"]
+    osmesa_empty_rc.add_scene(dd, field, no_ghost=True)
+    osmesa_empty_rc.scene.components[0].sample_factor = 20.0
+    osmesa_empty_rc.scene.components[0].cmap_log = False
+    cpos = bbox_options[bbox_option].get("camera_position", None)
+    if cpos:
+        osmesa_empty_rc.scene.camera.position = cpos
+
+    image_store(osmesa_empty_rc)
+
+
+@pytest.mark.parametrize("nprocs", [1, 2, 4, 16])
+def test_spherical_nprocs(osmesa_empty_rc, image_store, nprocs):
+
+    sz = (32, 32, 32)
+    fake_data = {"density": np.random.random(sz)}
+
+    bbox_option = "whole"
+    bbox = bbox_options[bbox_option]["bbox"]
+
+    ds = yt.load_uniform_grid(
+        fake_data,
+        sz,
+        bbox=bbox,
+        nprocs=nprocs,
         geometry=("spherical", ("r", "phi", "theta")),
         length_unit="m",
     )
     dd = ds.all_data()
-    rc = yt_idv.render_context("osmesa", width=1024, height=1024)
-    rc.add_scene(dd, ("index", "phi"), no_ghost=True)
-    rc.scene.components[0].sample_factor = 20.0
-    yield rc
-    rc.osmesa.OSMesaDestroyContext(rc.context)
 
+    field = bbox_options[bbox_option]["field"]
+    osmesa_empty_rc.add_scene(dd, field, no_ghost=True)
+    osmesa_empty_rc.scene.components[0].sample_factor = 20.0
+    osmesa_empty_rc.scene.components[0].cmap_log = False
+    osmesa_empty_rc.scene.components[0]._reset_cmap_bounds()
+    cpos = bbox_options[bbox_option].get("camera_position", None)
+    if cpos:
+        osmesa_empty_rc.scene.camera.position = cpos
 
-def test_spherical(osmesa_fake_spherical, image_store):
-    image_store(osmesa_fake_spherical)
+    image_store(osmesa_empty_rc)