diff --git a/include/entity.h b/include/entity.h
index ba65c3a..fc16687 100644
--- a/include/entity.h
+++ b/include/entity.h
@@ -28,6 +28,8 @@ bool entInitModel(entity& e, const char* model_path);
 
 bool entInitMesh(entity& e, simple_mesh* mesh, GLenum draw_mode);
 
+void entUpdateSimpleMesh(entity& e, simple_mesh* mesh, GLenum draw_mode);
+
 void entFree(entity& e);
 
 void entSetWorldPosition(entity& e, glm::vec3 v);
diff --git a/include/render_object.h b/include/render_object.h
index eeae99e..5196e47 100644
--- a/include/render_object.h
+++ b/include/render_object.h
@@ -28,3 +28,5 @@ roDraw(render_objects* r_ojbs,
 	shader_wrapper sw,
 	light_group* lights);
 
+void
+roUpdateSimpleMesh(render_objects* r_objs, simple_mesh* mesh, GLenum draw_mode);
diff --git a/src/entity.cpp b/src/entity.cpp
index 76226ac..5253599 100644
--- a/src/entity.cpp
+++ b/src/entity.cpp
@@ -45,6 +45,12 @@ entInitMesh(entity& e, simple_mesh* mesh, GLenum draw_mode)
 	return true;
 }
 
+void
+entUpdateSimpleMesh(entity& e, simple_mesh* mesh, GLenum draw_mode)
+{
+	roUpdateSimpleMesh(e.render_objs, mesh, draw_mode);
+}
+
 void
 entFree(entity& e)
 {
diff --git a/src/render_object.cpp b/src/render_object.cpp
index 48a00e1..346c85b 100644
--- a/src/render_object.cpp
+++ b/src/render_object.cpp
@@ -145,6 +145,28 @@ roDraw(render_objects* r_objs,
 		drawDefault(r_objs, world_transform, cam, sw, lights);
 }
 
+void
+roUpdateSimpleMesh(render_objects* r_objs, simple_mesh* mesh, GLenum draw_mode)
+{
+	assert(r_objs != nullptr && r_objs->objects != nullptr);
+	assert(mesh != nullptr && mesh->vertices != nullptr);
+	simple_render_object* sro = (simple_render_object*) r_objs->objects;
+	assert(sro->vertex_count == mesh->num_vertices);
+
+	sro->draw_mode = draw_mode;
+	glBindBuffer(GL_ARRAY_BUFFER, sro->vertex_buffer_id);
+	glBufferSubData(
+		GL_ARRAY_BUFFER,
+		0,
+		sro->vertex_count * sizeof(GLfloat),
+		mesh->vertices);
+	glBindBuffer(GL_ARRAY_BUFFER, sro->vertex_color_buffer_id);
+	glBufferSubData(
+		GL_ARRAY_BUFFER,
+		0,
+		sro->vertex_count * sizeof(GLfloat),
+		mesh->vert_colors);
+}
 
 // internal