It isn't obvious whether you should add vertices in global coordinates, or local to the ImmediateGeometry Node.
@@ -30,7 +30,7 @@
<argument index="0" name="position" type="Vector3">
</argument>
<description>
- Adds a vertex with the currently set color/uv/etc.
+ Adds a vertex in local coordinate space with the currently set color/uv/etc.
</description>
</method>
<method name="begin">
Ryan Roden-Corrent