diff --git a/test/models/IRRMesh/BrownGround_1-1.jpg b/test/models/IRRMesh/brownground_1-1.jpg
similarity index 100%
rename from test/models/IRRMesh/BrownGround_1-1.jpg
rename to test/models/IRRMesh/brownground_1-1.jpg
diff --git a/test/models/IRRMesh/CrackedGround_1-6.jpg b/test/models/IRRMesh/crackedground_1-6.jpg
similarity index 100%
rename from test/models/IRRMesh/CrackedGround_1-6.jpg
rename to test/models/IRRMesh/crackedground_1-6.jpg