From 9e08fe20e47ef9e0cb30798c29d947110cffec98 Mon Sep 17 00:00:00 2001
From: Filippo Luca Ferretti <102977828+flferretti@users.noreply.github.com>
Date: Thu, 13 Jun 2024 16:56:50 +0200
Subject: [PATCH] Check `plane_normal` type

From https://github.com/ami-iit/jaxsim/issues/176
---
 src/jaxsim/terrain/terrain.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/jaxsim/terrain/terrain.py b/src/jaxsim/terrain/terrain.py
index df0a0a402..c1f44081e 100644
--- a/src/jaxsim/terrain/terrain.py
+++ b/src/jaxsim/terrain/terrain.py
@@ -59,6 +59,10 @@ def build(plane_normal: list) -> "PlaneTerrain":
         Returns:
             PlaneTerrain: A PlaneTerrain instance.
         """
+        if not isinstance(plane_normal, list):
+            raise TypeError(
+                f"Expected a list for the plane normal vector, got: {type(plane_normal)}."
+            )
 
         return PlaneTerrain(plane_normal=plane_normal)