Fix nvert for scalar data file

niivue/niivue#729 (comment)
FNNDSC · Nov 7, 2023 · 14e04e2 · 14e04e2
1 parent b0d98ea
commit 14e04e2
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Showing 3 changed files with 6 additions and 3 deletions.
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mni2mz3"
-version = "0.1.0-rc.4"
+version = "0.1.1"
 edition = "2021"
 
 authors = ["Jennings Zhang <[email protected]>"]

diff --git a/src/mz3.rs b/src/mz3.rs
@@ -77,9 +77,12 @@ impl From<MniMeshRaw> for Mz3 {
 }
 
 fn data_to_mz3<W: Write>(data: Vec<f32>, sink: &mut W) -> io::Result<()> {
+    let n_vert = data.len() as u32;
     sink.write_all(MZ3_MAGIC_SIGNATURE)?;
     sink.write_all(MZ3_IS_SCALAR)?;
-    sink.write_all(&[0, 0, 0, 0, 0, 0, 0, 0])?; // NFACE=0 NVERT=0
+    sink.write_all(&0u32.to_le_bytes())?;  // NFACE=0
+    sink.write_all(&n_vert.to_le_bytes())?;
+    sink.write_all(&[0, 0, 0, 0, 0, 0, 0, 0])?;
     sink.write_all(NSKIP_EMPTY)?;
     for element in data {
         sink.write_all(&element.to_le_bytes())?;