diff --git a/__init__.py b/__init__.py
index c718750..6b4909d 100644
--- a/__init__.py
+++ b/__init__.py
@@ -365,6 +365,11 @@ set_param_vec3.argtypes = (
     ctypes.c_uint, # layout
     _vec3_p) # value
 
+set_param_mat3 = _engine.rk_set_param_mat3
+set_param_mat3.argtypes = (
+    ctypes.c_uint, # layout
+    _mat3_p) # value
+
 select_texture = _engine.rk_select_texture
 select_texture.argtypes = (
     ctypes.c_uint, # slot
diff --git a/cpp/render.hpp b/cpp/render.hpp
index a2d4b54..603210c 100644
--- a/cpp/render.hpp
+++ b/cpp/render.hpp
@@ -147,6 +147,10 @@ RK_EXPORT void rk_set_param_vec3(
     rk_param_t param,
     rk_vec3 const & value);
 
+RK_EXPORT void rk_set_param_mat3(
+    rk_param_t param,
+    rk_mat3 const & value);
+
 RK_EXPORT void rk_select_texture(
     rk_uint slot,
     rk_texture_t texture,
diff --git a/cpp/render/render_opengles.cpp b/cpp/render/render_opengles.cpp
index 746e67a..ed220eb 100644
--- a/cpp/render/render_opengles.cpp
+++ b/cpp/render/render_opengles.cpp
@@ -569,6 +569,17 @@ void rk_set_param_vec3(
     }
 }
 
+void rk_set_param_mat3(
+    rk_param_t _param,
+    rk_mat3 const & value) {
+    GLint const param = reinterpret_cast<intptr_t>(_param) - 1;
+    if (rk_current_shader && param > -1) {
+        glVertexAttrib3fv(param + 0, glm::value_ptr(value[0]));
+        glVertexAttrib3fv(param + 1, glm::value_ptr(value[1]));
+        glVertexAttrib3fv(param + 2, glm::value_ptr(value[2]));
+    }
+}
+
 void rk_select_texture(
     rk_uint slot,
     rk_texture_t _texture,