diff --git a/example/sprite.cpp b/example/sprite.cpp
index 5fa3bd4..3e91ece 100644
--- a/example/sprite.cpp
+++ b/example/sprite.cpp
@@ -70,7 +70,7 @@ uint32_t transform(uint32_t * ta_parameter_buf)
 				       quad_vertices[2].z,
 				       quad_vertices[3].x,
 				       quad_vertices[3].y);
-  // curiously, there is no quad_veritices[3].z in vertex_sprite_type_0
+  // curiously, there is no quad_vertices[3].z in vertex_sprite_type_0
 
   parameter.append<ta_global_parameter::end_of_list>() = ta_global_parameter::end_of_list(para_control::para_type::end_of_list);
 
diff --git a/example/video_output.cpp b/example/video_output.cpp
index 61ccc16..8be6c07 100644
--- a/example/video_output.cpp
+++ b/example/video_output.cpp
@@ -101,7 +101,7 @@ uint32_t transform(uint32_t * ta_parameter_buf,
 				       b.x, b.y, b.z,
 				       c.x, c.y, c.z,
 				       d.x, d.y);
-  // curiously, there is no quad_veritices[3].z in vertex_sprite_type_0
+  // curiously, there is no quad_vertices[3].z in vertex_sprite_type_0
 
   parameter.append<ta_global_parameter::end_of_list>() = ta_global_parameter::end_of_list(para_control::para_type::end_of_list);
 
diff --git a/example/wiffle_attenuation.cpp b/example/wiffle_attenuation.cpp
index 889ee52..30f32da 100644
--- a/example/wiffle_attenuation.cpp
+++ b/example/wiffle_attenuation.cpp
@@ -91,7 +91,7 @@ void transform(ta_parameter_writer& parameter,
       auto l = lights[0] - point;
       auto n_dot_l = dot(n, l);
       if (n_dot_l > 0) {
-	float distance = length(lights[0] - point);
+	float distance = magnitude(lights[0] - point);
 	float attenuation = 1.0 / (1.0f
 				   + 0.07f * distance
 				   + 0.007f * (distance * distance));
@@ -103,7 +103,7 @@ void transform(ta_parameter_writer& parameter,
       auto l = lights[1] - point;
       auto n_dot_l = dot(n, l);
       if (n_dot_l > 0) {
-	float distance = length(lights[1] - point);
+	float distance = magnitude(lights[1] - point);
 	float attenuation = 1.0 / (1.0f
 				   + 0.07f * distance
 				   + 0.007f * (distance * distance));
@@ -115,7 +115,7 @@ void transform(ta_parameter_writer& parameter,
       auto l = lights[2] - point;
       auto n_dot_l = dot(n, l);
       if (n_dot_l > 0) {
-	float distance = length(lights[2] - point);
+	float distance = magnitude(lights[2] - point);
 	float attenuation = 1.0 / (1.0f
 				   + 0.07f * distance
 				   + 0.007f * (distance * distance));