Add configurable memory section and README section

tool_nodes/dora-rerun/README.md

@@ -13,3 +13,27 @@ cargo install --force [email protected]
 git clone [email protected]:dora-rs/dora.git
 cargo install --git https://github.com/dora-rs/dora dora-rerun
 ```
+
+## Adding to existing graph:
+
+```yaml
+- id: rerun
+  custom:
+    source: dora-rerun
+    inputs:
+      image: webcam/image
+      text: webcam/text
+      boxes2d: object_detection/bbox
+    envs:
+      IMAGE_WIDTH: 960
+      IMAGE_HEIGHT: 540
+      IMAGE_DEPTH: 3
+      RERUN_MEMORY_LIMIT: 25%
+```
+
+## Configurations
+
+- IMAGE_WIDTH: Image width in pixels
+- IMAGE_HEIGHT: Image height in heights
+- IMAGE_DEPTH: Image depth
+- RERUN_MEMORY_LIMIT: Rerun memory limit

tool_nodes/dora-rerun/src/main.rs

@@ -19,7 +19,12 @@ fn main() -> Result<()> {
 
     // Limit memory usage
     let mut options = SpawnOptions::default();
-    options.memory_limit = "25%".into();
+
+    let memory_limit = std::env::var("RERUN_MEMORY_LIMIT")
+        .context("Could not read image height")?
+        .parse::<String>()
+        .unwrap_or("25%".into());
+    options.memory_limit = memory_limit;
 
     let rec = rerun::RecordingStreamBuilder::new("dora-rerun")
         .spawn_opts(&options, None)