Support displaying 1D tensors

CHANGELOG.md

@@ -108,6 +108,7 @@ Blueprints are currently only supported in the Python API, with C++ and Rust sup
 - Entity path query now shows simple statistics and warns if nothing is displayed [#5693](https://github.com/rerun-io/rerun/pull/5693)
 - Go back to example page with browser Back-button [#5750](https://github.com/rerun-io/rerun/pull/5750)
 - On Web, implement navigating back/forward with mouse buttons [#5792](https://github.com/rerun-io/rerun/pull/5792)
+- Support displaying 1D tensors [#5837](https://github.com/rerun-io/rerun/pull/5837)
 
 #### 🧑‍🏫 Examples
 - New `incremental_logging` example [#5462](https://github.com/rerun-io/rerun/pull/5462)

crates/re_space_view_tensor/src/dimension_mapping.rs

@@ -45,8 +45,8 @@ impl DimensionMapping {
             },
 
             1 => DimensionMapping {
-                selectors: vec![DimensionSelector::new(0)],
-                width: None,
+                selectors: Default::default(),
+                width: Some(0),
                 height: None,
                 invert_width: false,
                 invert_height: false,

crates/re_space_view_tensor/src/space_view_class.rs

@@ -565,18 +565,37 @@ pub fn selected_tensor_slice<'a, T: Copy>(
 
     assert!(dimension_mapping.is_valid(tensor.ndim()));
 
-    // TODO(andreas) - shouldn't just give up here
-    if dimension_mapping.width.is_none() || dimension_mapping.height.is_none() {
-        return tensor.view();
-    }
+    let (width, height) =
+        if let (Some(width), Some(height)) = (dimension_mapping.width, dimension_mapping.height) {
+            (width, height)
+        } else if let Some(width) = dimension_mapping.width {
+            // If height is missing, create a 1D row.
+            (width, 1)
+        } else if let Some(height) = dimension_mapping.height {
+            // If width is missing, create a 1D column.
+            (1, height)
+        } else {
+            // If both are missing, give up.
+            return tensor.view();
+        };
+
+    let view = if tensor.shape().len() == 1 {
+        // We want 2D slices, so for "pure" 1D tensors add a dimension.
+        // This is important for above width/height conversion to work since this assumes at least 2 dimensions.
+        tensor
+            .view()
+            .into_shape(ndarray::IxDyn(&[tensor.len(), 1]))
+            .unwrap()
+    } else {
+        tensor.view()
+    };
 
-    let axis = dimension_mapping
-        .height
+    #[allow(clippy::tuple_array_conversions)]
+    let axis = [height, width]
         .into_iter()
-        .chain(dimension_mapping.width)
         .chain(dimension_mapping.selectors.iter().map(|s| s.dim_idx))
         .collect::<Vec<_>>();
-    let mut slice = tensor.view().permuted_axes(axis);
+    let mut slice = view.permuted_axes(axis);
 
     for DimensionSelector { dim_idx, .. } in &dimension_mapping.selectors {
         let selector_value = selector_values.get(dim_idx).copied().unwrap_or_default() as usize;

crates/re_space_view_tensor/src/visualizer_system.rs

@@ -1,12 +1,10 @@
 use re_data_store::{LatestAtQuery, VersionedComponent};
 use re_entity_db::EntityPath;
 use re_log_types::RowId;
-use re_space_view::diff_component_filter;
 use re_types::{archetypes::Tensor, components::TensorData, tensor_data::DecodedTensor};
 use re_viewer_context::{
     IdentifiedViewSystem, SpaceViewSystemExecutionError, TensorDecodeCache, ViewContextCollection,
-    ViewQuery, ViewerContext, VisualizerAdditionalApplicabilityFilter, VisualizerQueryInfo,
-    VisualizerSystem,
+    ViewQuery, ViewerContext, VisualizerQueryInfo, VisualizerSystem,
 };
 
 #[derive(Default)]
@@ -20,25 +18,11 @@ impl IdentifiedViewSystem for TensorSystem {
     }
 }
 
-struct TensorVisualizerEntityFilter;
-
-impl VisualizerAdditionalApplicabilityFilter for TensorVisualizerEntityFilter {
-    fn update_applicability(&mut self, event: &re_data_store::StoreEvent) -> bool {
-        diff_component_filter(event, |tensor: &re_types::components::TensorData| {
-            !tensor.is_vector()
-        })
-    }
-}
-
 impl VisualizerSystem for TensorSystem {
     fn visualizer_query_info(&self) -> VisualizerQueryInfo {
         VisualizerQueryInfo::from_archetype::<Tensor>()
     }
 
-    fn applicability_filter(&self) -> Option<Box<dyn VisualizerAdditionalApplicabilityFilter>> {
-        Some(Box::new(TensorVisualizerEntityFilter))
-    }
-
     fn execute(
         &mut self,
         ctx: &ViewerContext<'_>,