diff --git a/lyceanem/raycasting/rayfunctions.py b/lyceanem/raycasting/rayfunctions.py
index 45c5742..20dcba4 100644
--- a/lyceanem/raycasting/rayfunctions.py
+++ b/lyceanem/raycasting/rayfunctions.py
@@ -14,6 +14,7 @@
 import lyceanem.base_types as base_types
 import lyceanem.electromagnetics.empropagation as EM
 from ..utility import math_functions as math_functions
+import meshio
 
 EPSILON = 1e-6  # how close to zero do we consider zero? example used 1e-7
 
@@ -670,14 +671,15 @@ def azeltocart(az_data, el_data, radius):
 
 def convertTriangles(triangle_object):
     """
-    convert o3d triangle object to ray tracer triangle class
+    convert meshio.Mesh triangle object to ray tracer triangle class
     """
     if triangle_object == None:
         triangles = np.empty(0, dtype=base_types.triangle_t)
     else:
-        vertices = np.asarray(triangle_object.vertices)
-        tri_index = np.asarray(triangle_object.triangles)
-        normals = np.asarray(triangle_object.triangle_normals)
+        assert triangle_object.cells[0].type == "triangle", "Not a triangle mesh"
+
+        vertices = np.asarray(triangle_object.points)
+        tri_index = np.asarray(triangle_object.cells[0].data)
         triangles = np.empty(len(tri_index), dtype=base_types.triangle_t)
         for idx in range(len(tri_index)):
             triangles[idx]["v0x"] = np.single(vertices[tri_index[idx, 0], 0])
@@ -689,9 +691,6 @@ def convertTriangles(triangle_object):
             triangles[idx]["v2x"] = np.single(vertices[tri_index[idx, 2], 0])
             triangles[idx]["v2y"] = np.single(vertices[tri_index[idx, 2], 1])
             triangles[idx]["v2z"] = np.single(vertices[tri_index[idx, 2], 2])
-            # triangles[idx]['normx']=np.single(normals[idx,0])
-            # triangles[idx]['normy']=np.single(normals[idx,1])
-            # triangles[idx]['normz']=np.single(normals[idx,2])
 
     return triangles
 
diff --git a/lyceanem/tests/data/triangle_type_array_ref.npy b/lyceanem/tests/data/triangle_type_array_ref.npy
new file mode 100644
index 0000000..0b35c64
Binary files /dev/null and b/lyceanem/tests/data/triangle_type_array_ref.npy differ
diff --git a/lyceanem/tests/test_ray_functions.py b/lyceanem/tests/test_ray_functions.py
new file mode 100644
index 0000000..8cb4322
--- /dev/null
+++ b/lyceanem/tests/test_ray_functions.py
@@ -0,0 +1,24 @@
+from ..raycasting import rayfunctions as RF 
+import numpy as np
+import pytest
+import lyceanem.base_types as base_types
+
+import meshio
+
+def test_convertTriangles():
+    reference = np.load("data/triangle_type_array_ref.npy")
+    mesh = meshio.read("data/receive_horn.ply")
+    triangles = RF.convertTriangles(mesh)
+    for i in range(triangles.size):
+        assert np.allclose(triangles[i]["v0x"], reference[i]["v0x"])
+        assert np.allclose(triangles[i]["v0y"], reference[i]["v0y"])
+        assert np.allclose(triangles[i]["v0z"], reference[i]["v0z"])
+        assert np.allclose(triangles[i]["v1x"], reference[i]["v1x"])
+        assert np.allclose(triangles[i]["v1y"], reference[i]["v1y"])
+        assert np.allclose(triangles[i]["v1z"], reference[i]["v1z"])
+        assert np.allclose(triangles[i]["v2x"], reference[i]["v2x"])
+        assert np.allclose(triangles[i]["v2y"], reference[i]["v2y"])
+        assert np.allclose(triangles[i]["v2z"], reference[i]["v2z"])
+
+
+