diff --git a/basic-geometry/dual-number.c b/basic-geometry/dual-number.c
index adc4a82..d8fd6bf 100644
--- a/basic-geometry/dual-number.c
+++ b/basic-geometry/dual-number.c
@@ -1,34 +1,43 @@
 #include "dual-number.h"
 
-inline void bgc_fp32_dual_number_reset(BGC_FP32_DualNumber* number);
-inline void bgc_fp64_dual_number_reset(BGC_FP64_DualNumber* number);
+extern inline void bgc_fp32_dual_number_reset(BGC_FP32_DualNumber* number);
+extern inline void bgc_fp64_dual_number_reset(BGC_FP64_DualNumber* number);
 
-inline void bgc_fp32_dual_number_make(BGC_FP32_DualNumber* number, const float real, const float dual);
-inline void bgc_fp64_dual_number_make(BGC_FP64_DualNumber* number, const double real, const double dual);
+extern inline void bgc_fp32_dual_number_make(BGC_FP32_DualNumber* number, const float real, const float dual);
+extern inline void bgc_fp64_dual_number_make(BGC_FP64_DualNumber* number, const double real, const double dual);
 
-inline void bgc_fp32_dual_number_copy(BGC_FP32_DualNumber* destination, const BGC_FP32_DualNumber* source);
-inline void bgc_fp64_dual_number_copy(BGC_FP64_DualNumber* destination, const BGC_FP64_DualNumber* source);
+extern inline void bgc_fp32_dual_number_copy(BGC_FP32_DualNumber* destination, const BGC_FP32_DualNumber* source);
+extern inline void bgc_fp64_dual_number_copy(BGC_FP64_DualNumber* destination, const BGC_FP64_DualNumber* source);
 
-inline void bgc_fp32_dual_number_swap(BGC_FP32_DualNumber* first, BGC_FP32_DualNumber* second);
-inline void bgc_fp64_dual_number_swap(BGC_FP64_DualNumber* first, BGC_FP64_DualNumber* second);
+extern inline void bgc_fp32_dual_number_swap(BGC_FP32_DualNumber* first, BGC_FP32_DualNumber* second);
+extern inline void bgc_fp64_dual_number_swap(BGC_FP64_DualNumber* first, BGC_FP64_DualNumber* second);
 
-inline void bgc_fp32_dual_number_add(BGC_FP32_DualNumber* sum, const BGC_FP32_DualNumber* first, const BGC_FP32_DualNumber* second);
-inline void bgc_fp64_dual_number_add(BGC_FP64_DualNumber* sum, const BGC_FP64_DualNumber* first, const BGC_FP64_DualNumber* second);
+extern inline void bgc_fp32_dual_number_add(BGC_FP32_DualNumber* sum, const BGC_FP32_DualNumber* first, const BGC_FP32_DualNumber* second);
+extern inline void bgc_fp64_dual_number_add(BGC_FP64_DualNumber* sum, const BGC_FP64_DualNumber* first, const BGC_FP64_DualNumber* second);
 
-inline void bgc_fp32_dual_number_add_scaled(BGC_FP32_DualNumber* sum, const BGC_FP32_DualNumber* base_number, const BGC_FP32_DualNumber* scalable_number, const float scale);
-inline void bgc_fp64_dual_number_add_scaled(BGC_FP64_DualNumber* sum, const BGC_FP64_DualNumber* base_number, const BGC_FP64_DualNumber* scalable_number, const double scale);
+extern inline void bgc_fp32_dual_number_add_scaled(BGC_FP32_DualNumber* sum, const BGC_FP32_DualNumber* base_number, const BGC_FP32_DualNumber* scalable_number, const float scale);
+extern inline void bgc_fp64_dual_number_add_scaled(BGC_FP64_DualNumber* sum, const BGC_FP64_DualNumber* base_number, const BGC_FP64_DualNumber* scalable_number, const double scale);
 
-inline void bgc_fp32_dual_number_subtract(BGC_FP32_DualNumber* difference, const BGC_FP32_DualNumber* minuend, const BGC_FP32_DualNumber* subtrahend);
-inline void bgc_fp64_dual_number_subtract(BGC_FP64_DualNumber* difference, const BGC_FP64_DualNumber* minuend, const BGC_FP64_DualNumber* subtrahend);
+extern inline void bgc_fp32_dual_number_subtract(BGC_FP32_DualNumber* difference, const BGC_FP32_DualNumber* minuend, const BGC_FP32_DualNumber* subtrahend);
+extern inline void bgc_fp64_dual_number_subtract(BGC_FP64_DualNumber* difference, const BGC_FP64_DualNumber* minuend, const BGC_FP64_DualNumber* subtrahend);
 
-inline void bgc_fp32_dual_number_multiply(BGC_FP32_DualNumber* product, const BGC_FP32_DualNumber* multiplicand, const float multiplier);
-inline void bgc_fp64_dual_number_multiply(BGC_FP64_DualNumber* product, const BGC_FP64_DualNumber* multiplicand, const double multiplier);
+extern inline void bgc_fp32_dual_number_multiply(BGC_FP32_DualNumber* product, const BGC_FP32_DualNumber* multiplicand, const float multiplier);
+extern inline void bgc_fp64_dual_number_multiply(BGC_FP64_DualNumber* product, const BGC_FP64_DualNumber* multiplicand, const double multiplier);
 
-inline void bgc_fp32_dual_number_divide(BGC_FP32_DualNumber* quotient, const BGC_FP32_DualNumber* dividend, const float divisor);
-inline void bgc_fp64_dual_number_divide(BGC_FP64_DualNumber* quotient, const BGC_FP64_DualNumber* dividend, const double divisor);
+extern inline void bgc_fp32_dual_number_divide(BGC_FP32_DualNumber* quotient, const BGC_FP32_DualNumber* dividend, const float divisor);
+extern inline void bgc_fp64_dual_number_divide(BGC_FP64_DualNumber* quotient, const BGC_FP64_DualNumber* dividend, const double divisor);
 
-inline void bgc_fp32_dual_number_get_mean2(BGC_FP32_DualNumber* mean, const BGC_FP32_DualNumber* first, const BGC_FP32_DualNumber* second);
-inline void bgc_fp64_dual_number_get_mean2(BGC_FP64_DualNumber* mean, const BGC_FP64_DualNumber* first, const BGC_FP64_DualNumber* second);
+extern inline void bgc_fp32_dual_number_get_mean2(BGC_FP32_DualNumber* mean, const BGC_FP32_DualNumber* first, const BGC_FP32_DualNumber* second);
+extern inline void bgc_fp64_dual_number_get_mean2(BGC_FP64_DualNumber* mean, const BGC_FP64_DualNumber* first, const BGC_FP64_DualNumber* second);
 
-inline void bgc_fp32_dual_number_get_mean3(BGC_FP32_DualNumber* mean, const BGC_FP32_DualNumber* first, const BGC_FP32_DualNumber* second, const BGC_FP32_DualNumber* third);
-inline void bgc_fp64_dual_number_get_mean3(BGC_FP64_DualNumber* mean, const BGC_FP64_DualNumber* first, const BGC_FP64_DualNumber* second, const BGC_FP64_DualNumber* third);
+extern inline void bgc_fp32_dual_number_get_mean3(BGC_FP32_DualNumber* mean, const BGC_FP32_DualNumber* first, const BGC_FP32_DualNumber* second, const BGC_FP32_DualNumber* third);
+extern inline void bgc_fp64_dual_number_get_mean3(BGC_FP64_DualNumber* mean, const BGC_FP64_DualNumber* first, const BGC_FP64_DualNumber* second, const BGC_FP64_DualNumber* third);
+
+extern inline void bgc_fp32_dual_number_interpolate(BGC_FP32_DualNumber* interpolation, const BGC_FP32_DualNumber* first, const BGC_FP32_DualNumber* second, const float phase);
+extern inline void bgc_fp64_dual_number_interpolate(BGC_FP64_DualNumber* interpolation, const BGC_FP64_DualNumber* first, const BGC_FP64_DualNumber* second, const double phase);
+
+extern inline void bgc_fp32_dual_number_revert(BGC_FP32_DualNumber* number);
+extern inline void bgc_fp64_dual_number_revert(BGC_FP64_DualNumber* number);
+
+extern inline void bgc_fp32_number_get_reverse(BGC_FP32_DualNumber* reverse, const BGC_FP32_DualNumber* number);
+extern inline void bgc_fp64_number_get_reverse(BGC_FP64_DualNumber* reverse, const BGC_FP64_DualNumber* number);
diff --git a/basic-geometry/dual-number.h b/basic-geometry/dual-number.h
index 98a961a..f1a4e2a 100644
--- a/basic-geometry/dual-number.h
+++ b/basic-geometry/dual-number.h
@@ -165,4 +165,50 @@ inline void bgc_fp64_dual_number_get_mean3(BGC_FP64_DualNumber* mean, const BGC_
     mean->dual = (first->dual + second->dual + third->dual) * BGC_FP64_ONE_THIRD;
 }
 
+// ============ Linear Interpolation ============ //
+
+inline void bgc_fp32_dual_number_interpolate(BGC_FP32_DualNumber* interpolation, const BGC_FP32_DualNumber* first, const BGC_FP32_DualNumber* second, const float phase)
+{
+    const float counter_phase = 1.0f - phase;
+
+    interpolation->real = first->real *counter_phase + second->real * phase;
+    interpolation->dual = first->dual *counter_phase + second->dual * phase;
+}
+
+inline void bgc_fp64_dual_number_interpolate(BGC_FP64_DualNumber* interpolation, const BGC_FP64_DualNumber* first, const BGC_FP64_DualNumber* second, const double phase)
+{
+    const double counter_phase = 1.0 - phase;
+
+    interpolation->real = first->real * counter_phase + second->real * phase;
+    interpolation->dual = first->dual * counter_phase + second->dual * phase;
+}
+
+// =================== Revert =================== //
+
+inline void bgc_fp32_dual_number_revert(BGC_FP32_DualNumber* number)
+{
+    number->real = -number->real;
+    number->dual = -number->dual;
+}
+
+inline void bgc_fp64_dual_number_revert(BGC_FP64_DualNumber* number)
+{
+    number->real = -number->real;
+    number->dual = -number->dual;
+}
+
+// ================ Get Reverse ================= //
+
+inline void bgc_fp32_number_get_reverse(BGC_FP32_DualNumber* reverse, const BGC_FP32_DualNumber* number)
+{
+    reverse->real = -number->real;
+    reverse->dual = -number->dual;
+}
+
+inline void bgc_fp64_number_get_reverse(BGC_FP64_DualNumber* reverse, const BGC_FP64_DualNumber* number)
+{
+    reverse->real = -number->real;
+    reverse->dual = -number->dual;
+}
+
 #endif
diff --git a/basic-geometry/dual-quaternion.c b/basic-geometry/dual-quaternion.c
index 74d8b4c..4db7e44 100644
--- a/basic-geometry/dual-quaternion.c
+++ b/basic-geometry/dual-quaternion.c
@@ -33,5 +33,11 @@ extern inline void bgc_fp64_dual_quaternion_get_mean2(BGC_FP64_DualQuaternion* m
 extern inline void bgc_fp32_dual_quaternion_get_mean3(BGC_FP32_DualQuaternion* mean, const BGC_FP32_DualQuaternion* quaternion1, const BGC_FP32_DualQuaternion* quaternion2, const BGC_FP32_DualQuaternion* quaternion3);
 extern inline void bgc_fp64_dual_quaternion_get_mean3(BGC_FP64_DualQuaternion* mean, const BGC_FP64_DualQuaternion* quaternion1, const BGC_FP64_DualQuaternion* quaternion2, const BGC_FP64_DualQuaternion* quaternion3);
 
-extern inline void bgc_fp32_dual_quaternion_interpolate(BGC_FP32_DualQuaternion* interpolation, const BGC_FP32_DualQuaternion* quaternion1, const BGC_FP32_DualQuaternion* quaternion2, const float phase);
-extern inline void bgc_fp64_dual_quaternion_interpolate(BGC_FP64_DualQuaternion* interpolation, const BGC_FP64_DualQuaternion* quaternion1, const BGC_FP64_DualQuaternion* quaternion2, const double phase);
+extern inline void bgc_fp32_dual_quaternion_interpolate(BGC_FP32_DualQuaternion* interpolation, const BGC_FP32_DualQuaternion* first, const BGC_FP32_DualQuaternion* second, const float phase);
+extern inline void bgc_fp64_dual_quaternion_interpolate(BGC_FP64_DualQuaternion* interpolation, const BGC_FP64_DualQuaternion* first, const BGC_FP64_DualQuaternion* second, const double phase);
+
+extern inline void bgc_fp32_dual_quaternion_revert(BGC_FP32_DualQuaternion* quaternion);
+extern inline void bgc_fp64_dual_quaternion_revert(BGC_FP64_DualQuaternion* quaternion);
+
+extern inline void bgc_fp32_dual_quaternion_get_reverse(BGC_FP32_DualQuaternion* reverse, const BGC_FP32_DualQuaternion* quaternion);
+extern inline void bgc_fp64_dual_quaternion_get_reverse(BGC_FP64_DualQuaternion* reverse, const BGC_FP64_DualQuaternion* quaternion);
diff --git a/basic-geometry/dual-quaternion.h b/basic-geometry/dual-quaternion.h
index 97784b6..e3f3357 100644
--- a/basic-geometry/dual-quaternion.h
+++ b/basic-geometry/dual-quaternion.h
@@ -167,16 +167,44 @@ inline void bgc_fp64_dual_quaternion_get_mean3(BGC_FP64_DualQuaternion* mean, co
 
 // ============ Linear Interpolation ============ //
 
-inline void bgc_fp32_dual_quaternion_interpolate(BGC_FP32_DualQuaternion* interpolation, const BGC_FP32_DualQuaternion* quaternion1, const BGC_FP32_DualQuaternion* quaternion2, const float phase)
+inline void bgc_fp32_dual_quaternion_interpolate(BGC_FP32_DualQuaternion* interpolation, const BGC_FP32_DualQuaternion* first, const BGC_FP32_DualQuaternion* second, const float phase)
 {
-    bgc_fp32_quaternion_interpolate(&interpolation->real, &quaternion1->real, &quaternion2->real, phase);
-    bgc_fp32_quaternion_interpolate(&interpolation->dual, &quaternion1->dual, &quaternion2->dual, phase);
+    bgc_fp32_quaternion_interpolate(&interpolation->real, &first->real, &second->real, phase);
+    bgc_fp32_quaternion_interpolate(&interpolation->dual, &first->dual, &second->dual, phase);
 }
 
-inline void bgc_fp64_dual_quaternion_interpolate(BGC_FP64_DualQuaternion* interpolation, const BGC_FP64_DualQuaternion* quaternion1, const BGC_FP64_DualQuaternion* quaternion2, const double phase)
+inline void bgc_fp64_dual_quaternion_interpolate(BGC_FP64_DualQuaternion* interpolation, const BGC_FP64_DualQuaternion* first, const BGC_FP64_DualQuaternion* second, const double phase)
 {
-    bgc_fp64_quaternion_interpolate(&interpolation->real, &quaternion1->real, &quaternion2->real, phase);
-    bgc_fp64_quaternion_interpolate(&interpolation->dual, &quaternion1->dual, &quaternion2->dual, phase);
+    bgc_fp64_quaternion_interpolate(&interpolation->real, &first->real, &second->real, phase);
+    bgc_fp64_quaternion_interpolate(&interpolation->dual, &first->dual, &second->dual, phase);
+}
+
+// =================== Revert =================== //
+
+inline void bgc_fp32_dual_quaternion_revert(BGC_FP32_DualQuaternion* quaternion)
+{
+    bgc_fp32_quaternion_revert(&quaternion->real);
+    bgc_fp32_quaternion_revert(&quaternion->dual);
+}
+
+inline void bgc_fp64_dual_quaternion_revert(BGC_FP64_DualQuaternion* quaternion)
+{
+    bgc_fp64_quaternion_revert(&quaternion->real);
+    bgc_fp64_quaternion_revert(&quaternion->dual);
+}
+
+// ================ Get Reverse ================= //
+
+inline void bgc_fp32_dual_quaternion_get_reverse(BGC_FP32_DualQuaternion* reverse, const BGC_FP32_DualQuaternion* quaternion)
+{
+    bgc_fp32_quaternion_get_reverse(&reverse->real, &quaternion->real);
+    bgc_fp32_quaternion_get_reverse(&reverse->dual, &quaternion->dual);
+}
+
+inline void bgc_fp64_dual_quaternion_get_reverse(BGC_FP64_DualQuaternion* reverse, const BGC_FP64_DualQuaternion* quaternion)
+{
+    bgc_fp64_quaternion_get_reverse(&reverse->real, &quaternion->real);
+    bgc_fp64_quaternion_get_reverse(&reverse->dual, &quaternion->dual);
 }
 
 #endif
diff --git a/basic-geometry/dual-vector3.c b/basic-geometry/dual-vector3.c
index 7e5d379..8b2b8cf 100644
--- a/basic-geometry/dual-vector3.c
+++ b/basic-geometry/dual-vector3.c
@@ -39,5 +39,11 @@ extern inline void bgc_fp64_dual_vector3_get_mean2(BGC_FP64_DualVector3* mean, c
 extern inline void bgc_fp32_dual_vector3_get_mean3(BGC_FP32_DualVector3* mean, const BGC_FP32_DualVector3* vector1, const BGC_FP32_DualVector3* vector2, const BGC_FP32_DualVector3* vector3);
 extern inline void bgc_fp64_dual_vector3_get_mean3(BGC_FP64_DualVector3* mean, const BGC_FP64_DualVector3* vector1, const BGC_FP64_DualVector3* vector2, const BGC_FP64_DualVector3* vector3);
 
-extern inline void bgc_fp32_dual_vector3_interpolate(BGC_FP32_DualVector3* interpolation, const BGC_FP32_DualVector3* quaternion1, const BGC_FP32_DualVector3* quaternion2, const float phase);
-extern inline void bgc_fp64_dual_vector3_interpolate(BGC_FP64_DualVector3* interpolation, const BGC_FP64_DualVector3* quaternion1, const BGC_FP64_DualVector3* quaternion2, const double phase);
+extern inline void bgc_fp32_dual_vector3_interpolate(BGC_FP32_DualVector3* interpolation, const BGC_FP32_DualVector3* first, const BGC_FP32_DualVector3* second, const float phase);
+extern inline void bgc_fp64_dual_vector3_interpolate(BGC_FP64_DualVector3* interpolation, const BGC_FP64_DualVector3* first, const BGC_FP64_DualVector3* second, const double phase);
+
+extern inline void bgc_fp32_dual_vector3_revert(BGC_FP32_DualVector3* vector);
+extern inline void bgc_fp64_dual_vector3_revert(BGC_FP64_DualVector3* vector);
+
+extern inline void bgc_fp32_dual_vector3_get_reverse(BGC_FP32_DualVector3* reverse, const BGC_FP32_DualVector3* vector);
+extern inline void bgc_fp64_dual_vector3_get_reverse(BGC_FP64_DualVector3* reverse, const BGC_FP64_DualVector3* vector);
diff --git a/basic-geometry/dual-vector3.h b/basic-geometry/dual-vector3.h
index b62efaa..5125099 100644
--- a/basic-geometry/dual-vector3.h
+++ b/basic-geometry/dual-vector3.h
@@ -169,7 +169,7 @@ inline void bgc_fp64_dual_vector3_divide(BGC_FP64_DualVector3* quotient, const B
     bgc_fp64_dual_vector3_multiply(quotient, dividend, 1.0 / divisor);
 }
 
-// ================== Average2 ================== //
+// ================ Mean of Two ================= //
 
 inline void bgc_fp32_dual_vector3_get_mean2(BGC_FP32_DualVector3* mean, const BGC_FP32_DualVector3* vector1, const BGC_FP32_DualVector3* vector2)
 {
@@ -183,7 +183,7 @@ inline void bgc_fp64_dual_vector3_get_mean2(BGC_FP64_DualVector3* mean, const BG
     bgc_fp64_vector3_get_mean2(&mean->dual, &vector1->dual, &vector2->dual);
 }
 
-// ================== Average3 ================== //
+// =============== Mean of Three ================ //
 
 inline void bgc_fp32_dual_vector3_get_mean3(BGC_FP32_DualVector3* mean, const BGC_FP32_DualVector3* vector1, const BGC_FP32_DualVector3* vector2, const BGC_FP32_DualVector3* vector3)
 {
@@ -199,16 +199,44 @@ inline void bgc_fp64_dual_vector3_get_mean3(BGC_FP64_DualVector3* mean, const BG
 
 // ============ Linear Interpolation ============ //
 
-inline void bgc_fp32_dual_vector3_interpolate(BGC_FP32_DualVector3* interpolation, const BGC_FP32_DualVector3* quaternion1, const BGC_FP32_DualVector3* quaternion2, const float phase)
+inline void bgc_fp32_dual_vector3_interpolate(BGC_FP32_DualVector3* interpolation, const BGC_FP32_DualVector3* first, const BGC_FP32_DualVector3* second, const float phase)
 {
-    bgc_fp32_vector3_interpolate(&interpolation->real, &quaternion1->real, &quaternion2->real, phase);
-    bgc_fp32_vector3_interpolate(&interpolation->dual, &quaternion1->dual, &quaternion2->dual, phase);
+    bgc_fp32_vector3_interpolate(&interpolation->real, &first->real, &second->real, phase);
+    bgc_fp32_vector3_interpolate(&interpolation->dual, &first->dual, &second->dual, phase);
 }
 
-inline void bgc_fp64_dual_vector3_interpolate(BGC_FP64_DualVector3* interpolation, const BGC_FP64_DualVector3* quaternion1, const BGC_FP64_DualVector3* quaternion2, const double phase)
+inline void bgc_fp64_dual_vector3_interpolate(BGC_FP64_DualVector3* interpolation, const BGC_FP64_DualVector3* first, const BGC_FP64_DualVector3* second, const double phase)
 {
-    bgc_fp64_vector3_interpolate(&interpolation->real, &quaternion1->real, &quaternion2->real, phase);
-    bgc_fp64_vector3_interpolate(&interpolation->dual, &quaternion1->dual, &quaternion2->dual, phase);
+    bgc_fp64_vector3_interpolate(&interpolation->real, &first->real, &second->real, phase);
+    bgc_fp64_vector3_interpolate(&interpolation->dual, &first->dual, &second->dual, phase);
+}
+
+// =================== Revert =================== //
+
+inline void bgc_fp32_dual_vector3_revert(BGC_FP32_DualVector3* vector)
+{
+    bgc_fp32_vector3_revert(&vector->real);
+    bgc_fp32_vector3_revert(&vector->dual);
+}
+
+inline void bgc_fp64_dual_vector3_revert(BGC_FP64_DualVector3* vector)
+{
+    bgc_fp64_vector3_revert(&vector->real);
+    bgc_fp64_vector3_revert(&vector->dual);
+}
+
+// ================ Get Reverse ================= //
+
+inline void bgc_fp32_dual_vector3_get_reverse(BGC_FP32_DualVector3* reverse, const BGC_FP32_DualVector3* vector)
+{
+    bgc_fp32_vector3_get_reverse(&reverse->real, &vector->real);
+    bgc_fp32_vector3_get_reverse(&reverse->dual, &vector->dual);
+}
+
+inline void bgc_fp64_dual_vector3_get_reverse(BGC_FP64_DualVector3* reverse, const BGC_FP64_DualVector3* vector)
+{
+    bgc_fp64_vector3_get_reverse(&reverse->real, &vector->real);
+    bgc_fp64_vector3_get_reverse(&reverse->dual, &vector->dual);
 }
 
 #endif
diff --git a/basic-geometry/vector2.c b/basic-geometry/vector2.c
index bb854bb..a80308d 100644
--- a/basic-geometry/vector2.c
+++ b/basic-geometry/vector2.c
@@ -48,8 +48,8 @@ extern inline void bgc_fp64_vector2_get_mean2(BGC_FP64_Vector2* mean, const BGC_
 extern inline void bgc_fp32_vector2_get_mean3(BGC_FP32_Vector2* mean, const BGC_FP32_Vector2* vector1, const BGC_FP32_Vector2* vector2, const BGC_FP32_Vector2* vector3);
 extern inline void bgc_fp64_vector2_get_mean3(BGC_FP64_Vector2* mean, const BGC_FP64_Vector2* vector1, const BGC_FP64_Vector2* vector2, const BGC_FP64_Vector2* vector3);
 
-extern inline void bgc_fp32_vector2_interpolate(BGC_FP32_Vector2* interpolation, const BGC_FP32_Vector2* vector1, const BGC_FP32_Vector2* vector2, const float phase);
-extern inline void bgc_fp64_vector2_interpolate(BGC_FP64_Vector2* interpolation, const BGC_FP64_Vector2* vector1, const BGC_FP64_Vector2* vector2, const double phase);
+extern inline void bgc_fp32_vector2_interpolate(BGC_FP32_Vector2* interpolation, const BGC_FP32_Vector2* first, const BGC_FP32_Vector2* second, const float phase);
+extern inline void bgc_fp64_vector2_interpolate(BGC_FP64_Vector2* interpolation, const BGC_FP64_Vector2* first, const BGC_FP64_Vector2* second, const double phase);
 
 extern inline void bgc_fp32_vector2_revert(BGC_FP32_Vector2* vector);
 extern inline void bgc_fp64_vector2_revert(BGC_FP64_Vector2* vector);
diff --git a/basic-geometry/vector2.h b/basic-geometry/vector2.h
index 7b1b38a..0dc1096 100644
--- a/basic-geometry/vector2.h
+++ b/basic-geometry/vector2.h
@@ -240,20 +240,20 @@ inline void bgc_fp64_vector2_get_mean3(BGC_FP64_Vector2* mean, const BGC_FP64_Ve
 
 // =================== Linear =================== //
 
-inline void bgc_fp32_vector2_interpolate(BGC_FP32_Vector2* interpolation, const BGC_FP32_Vector2* vector1, const BGC_FP32_Vector2* vector2, const float phase)
+inline void bgc_fp32_vector2_interpolate(BGC_FP32_Vector2* interpolation, const BGC_FP32_Vector2* first, const BGC_FP32_Vector2* second, const float phase)
 {
     const float counter_phase = 1.0f - phase;
 
-    interpolation->x1 = vector1->x1 * counter_phase + vector2->x1 * phase;
-    interpolation->x2 = vector1->x2 * counter_phase + vector2->x2 * phase;
+    interpolation->x1 = first->x1 * counter_phase + second->x1 * phase;
+    interpolation->x2 = first->x2 * counter_phase + second->x2 * phase;
 }
 
-inline void bgc_fp64_vector2_interpolate(BGC_FP64_Vector2* interpolation, const BGC_FP64_Vector2* vector1, const BGC_FP64_Vector2* vector2, const double phase)
+inline void bgc_fp64_vector2_interpolate(BGC_FP64_Vector2* interpolation, const BGC_FP64_Vector2* first, const BGC_FP64_Vector2* second, const double phase)
 {
     const double counter_phase = 1.0 - phase;
 
-    interpolation->x1 = vector1->x1 * counter_phase + vector2->x1 * phase;
-    interpolation->x2 = vector1->x2 * counter_phase + vector2->x2 * phase;
+    interpolation->x1 = first->x1 * counter_phase + second->x1 * phase;
+    interpolation->x2 = first->x2 * counter_phase + second->x2 * phase;
 }
 
 // ================== Negative ================== //
diff --git a/basic-geometry/vector3.h b/basic-geometry/vector3.h
index 3ed50c5..a9cdeb6 100644
--- a/basic-geometry/vector3.h
+++ b/basic-geometry/vector3.h
@@ -268,22 +268,22 @@ inline void bgc_fp64_vector3_get_mean3(BGC_FP64_Vector3* mean, const BGC_FP64_Ve
 
 // =================== Linear =================== //
 
-inline void bgc_fp32_vector3_interpolate(BGC_FP32_Vector3* interpolation, const BGC_FP32_Vector3* vector1, const BGC_FP32_Vector3* vector2, const float phase)
+inline void bgc_fp32_vector3_interpolate(BGC_FP32_Vector3* interpolation, const BGC_FP32_Vector3* first, const BGC_FP32_Vector3* second, const float phase)
 {
     const float counter_phase = 1.0f - phase;
 
-    interpolation->x1 = vector1->x1 * counter_phase + vector2->x1 * phase;
-    interpolation->x2 = vector1->x2 * counter_phase + vector2->x2 * phase;
-    interpolation->x3 = vector1->x3 * counter_phase + vector2->x3 * phase;
+    interpolation->x1 = first->x1 * counter_phase + second->x1 * phase;
+    interpolation->x2 = first->x2 * counter_phase + second->x2 * phase;
+    interpolation->x3 = first->x3 * counter_phase + second->x3 * phase;
 }
 
-inline void bgc_fp64_vector3_interpolate(BGC_FP64_Vector3* interpolation, const BGC_FP64_Vector3* vector1, const BGC_FP64_Vector3* vector2, const double phase)
+inline void bgc_fp64_vector3_interpolate(BGC_FP64_Vector3* interpolation, const BGC_FP64_Vector3* first, const BGC_FP64_Vector3* second, const double phase)
 {
     const double counter_phase = 1.0 - phase;
 
-    interpolation->x1 = vector1->x1 * counter_phase + vector2->x1 * phase;
-    interpolation->x2 = vector1->x2 * counter_phase + vector2->x2 * phase;
-    interpolation->x3 = vector1->x3 * counter_phase + vector2->x3 * phase;
+    interpolation->x1 = first->x1 * counter_phase + second->x1 * phase;
+    interpolation->x2 = first->x2 * counter_phase + second->x2 * phase;
+    interpolation->x3 = first->x3 * counter_phase + second->x3 * phase;
 }
 
 // ================== Negative ================== //