diff --git a/basic-geometry/basic-geometry.vcxproj b/basic-geometry/basic-geometry.vcxproj
index 5bbc782..6c03bb8 100644
--- a/basic-geometry/basic-geometry.vcxproj
+++ b/basic-geometry/basic-geometry.vcxproj
@@ -31,7 +31,7 @@
     <ClInclude Include="matrix2x3.h" />
     <ClInclude Include="matrix3x2.h" />
     <ClInclude Include="matrix3x3.h" />
-    <ClInclude Include="posture3.h" />
+    <ClInclude Include="rigid-pose3.h" />
     <ClInclude Include="types.h" />
     <ClInclude Include="position2.h" />
     <ClInclude Include="position3.h" />
@@ -53,7 +53,7 @@
     <ClCompile Include="dual-vector3.c" />
     <ClCompile Include="position2.c" />
     <ClCompile Include="position3.c" />
-    <ClCompile Include="posture3.c" />
+    <ClCompile Include="rigid-pose3.c" />
     <ClCompile Include="turn2.c" />
     <ClCompile Include="turn3.c" />
     <ClCompile Include="utilities.c" />
diff --git a/basic-geometry/basic-geometry.vcxproj.filters b/basic-geometry/basic-geometry.vcxproj.filters
index 49d9826..5ddf03b 100644
--- a/basic-geometry/basic-geometry.vcxproj.filters
+++ b/basic-geometry/basic-geometry.vcxproj.filters
@@ -84,7 +84,7 @@
     <ClInclude Include="slerp3.h">
       <Filter>Файлы заголовков</Filter>
     </ClInclude>
-    <ClInclude Include="posture3.h">
+    <ClInclude Include="rigid-pose3.h">
       <Filter>Файлы заголовков</Filter>
     </ClInclude>
   </ItemGroup>
@@ -146,7 +146,7 @@
     <ClCompile Include="slerp3.c">
       <Filter>Исходные файлы</Filter>
     </ClCompile>
-    <ClCompile Include="posture3.c">
+    <ClCompile Include="rigid-pose3.c">
       <Filter>Исходные файлы</Filter>
     </ClCompile>
   </ItemGroup>
diff --git a/basic-geometry/dual-quaternion.h b/basic-geometry/dual-quaternion.h
index 273657b..28f9e7d 100644
--- a/basic-geometry/dual-quaternion.h
+++ b/basic-geometry/dual-quaternion.h
@@ -410,8 +410,8 @@ inline void bgc_fp32_dual_quaternion_multiply_by_dual_quaternion(BGC_FP32_DualQu
 {
     BGC_FP32_Quaternion dual_part1, dual_part2;
 
-    bgc_fp32_quaternion_multiply_by_quaternion(&dual_part1, &left->real_part, &right->dual_part);
-    bgc_fp32_quaternion_multiply_by_quaternion(&dual_part2, &left->dual_part, &right->real_part);
+    _bgc_fp32_restrict_quaternion_multiply_by_quaternion(&dual_part1, &left->real_part, &right->dual_part);
+    _bgc_fp32_restrict_quaternion_multiply_by_quaternion(&dual_part2, &left->dual_part, &right->real_part);
 
     bgc_fp32_quaternion_multiply_by_quaternion(&product->real_part, &left->real_part, &right->real_part);
     bgc_fp32_quaternion_add(&product->dual_part, &dual_part1, &dual_part2);
diff --git a/basic-geometry/quaternion.c b/basic-geometry/quaternion.c
index dd9fac2..5c76579 100644
--- a/basic-geometry/quaternion.c
+++ b/basic-geometry/quaternion.c
@@ -58,6 +58,12 @@ extern inline void bgc_fp64_quaternion_multiply_by_dual_quaternion(BGC_FP64_Dual
 extern inline void bgc_fp32_quaternion_multiply_by_conjugate(BGC_FP32_Quaternion* product, const BGC_FP32_Quaternion* left, const BGC_FP32_Quaternion* right);
 extern inline void bgc_fp64_quaternion_multiply_by_conjugate(BGC_FP64_Quaternion* product, const BGC_FP64_Quaternion* left, const BGC_FP64_Quaternion* right);
 
+extern inline void _bgc_fp32_restrict_quaternion_multiply_by_quaternion(BGC_FP32_Quaternion* restrict product, const BGC_FP32_Quaternion* left, const BGC_FP32_Quaternion* right);
+extern inline void _bgc_fp64_restrict_quaternion_multiply_by_quaternion(BGC_FP64_Quaternion* restrict product, const BGC_FP64_Quaternion* left, const BGC_FP64_Quaternion* right);
+
+extern inline void _bgc_fp32_restrict_quaternion_multiply_by_conjugate(BGC_FP32_Quaternion* restrict product, const BGC_FP32_Quaternion* left, const BGC_FP32_Quaternion* right);
+extern inline void _bgc_fp64_restrict_quaternion_multiply_by_conjugate(BGC_FP64_Quaternion* restrict product, const BGC_FP64_Quaternion* left, const BGC_FP64_Quaternion* right);
+
 extern inline int bgc_fp32_quaternion_divide_by_real(BGC_FP32_Quaternion* quotient, const BGC_FP32_Quaternion* dividend, const float divisor);
 extern inline int bgc_fp64_quaternion_divide_by_real(BGC_FP64_Quaternion* quotient, const BGC_FP64_Quaternion* dividend, const double divisor);
 
diff --git a/basic-geometry/quaternion.h b/basic-geometry/quaternion.h
index 4edc232..5e513ac 100644
--- a/basic-geometry/quaternion.h
+++ b/basic-geometry/quaternion.h
@@ -330,6 +330,42 @@ inline void bgc_fp64_quaternion_multiply_by_conjugate(BGC_FP64_Quaternion* produ
     product->x3 = x3;
 }
 
+// ====== Restrict Multiply By Quaternion ======= //
+
+inline void _bgc_fp32_restrict_quaternion_multiply_by_quaternion(BGC_FP32_Quaternion* restrict product, const BGC_FP32_Quaternion* left, const BGC_FP32_Quaternion* right)
+{
+    product->s0 = (left->s0 * right->s0 - left->x1 * right->x1) - (left->x2 * right->x2 + left->x3 * right->x3);
+    product->x1 = (left->x1 * right->s0 + left->s0 * right->x1) - (left->x3 * right->x2 - left->x2 * right->x3);
+    product->x2 = (left->x2 * right->s0 + left->s0 * right->x2) - (left->x1 * right->x3 - left->x3 * right->x1);
+    product->x3 = (left->x3 * right->s0 + left->s0 * right->x3) - (left->x2 * right->x1 - left->x1 * right->x2);
+}
+
+inline void _bgc_fp64_restrict_quaternion_multiply_by_quaternion(BGC_FP64_Quaternion* restrict product, const BGC_FP64_Quaternion* left, const BGC_FP64_Quaternion* right)
+{
+    product->s0 = (left->s0 * right->s0 - left->x1 * right->x1) - (left->x2 * right->x2 + left->x3 * right->x3);
+    product->x1 = (left->x1 * right->s0 + left->s0 * right->x1) - (left->x3 * right->x2 - left->x2 * right->x3);
+    product->x2 = (left->x2 * right->s0 + left->s0 * right->x2) - (left->x1 * right->x3 - left->x3 * right->x1);
+    product->x3 = (left->x3 * right->s0 + left->s0 * right->x3) - (left->x2 * right->x1 - left->x1 * right->x2);
+}
+
+// = Restrict Multiply By Conjugate Quaternion == //
+
+inline void _bgc_fp32_restrict_quaternion_multiply_by_conjugate(BGC_FP32_Quaternion* restrict product, const BGC_FP32_Quaternion* left, const BGC_FP32_Quaternion* right)
+{
+    product->s0 = (left->s0 * right->s0 + left->x1 * right->x1) + (left->x2 * right->x2 + left->x3 * right->x3);
+    product->x1 = (left->x1 * right->s0 + left->x3 * right->x2) - (left->s0 * right->x1 + left->x2 * right->x3);
+    product->x2 = (left->x2 * right->s0 + left->x1 * right->x3) - (left->s0 * right->x2 + left->x3 * right->x1);
+    product->x3 = (left->x3 * right->s0 + left->x2 * right->x1) - (left->s0 * right->x3 + left->x1 * right->x2);
+}
+
+inline void _bgc_fp64_restrict_quaternion_multiply_by_conjugate(BGC_FP64_Quaternion* restrict product, const BGC_FP64_Quaternion* left, const BGC_FP64_Quaternion* right)
+{
+    product->s0 = (left->s0 * right->s0 + left->x1 * right->x1) + (left->x2 * right->x2 + left->x3 * right->x3);
+    product->x1 = (left->x1 * right->s0 + left->x3 * right->x2) - (left->s0 * right->x1 + left->x2 * right->x3);
+    product->x2 = (left->x2 * right->s0 + left->x1 * right->x3) - (left->s0 * right->x2 + left->x3 * right->x1);
+    product->x3 = (left->x3 * right->s0 + left->x2 * right->x1) - (left->s0 * right->x3 + left->x1 * right->x2);
+}
+
 // ========== Multiply By Dual Number =========== //
 
 inline void bgc_fp32_quaternion_multiply_by_dual_number(BGC_FP32_DualQuaternion* product, const BGC_FP32_Quaternion* multiplicand, const BGC_FP32_DualNumber* multiplier)
@@ -504,12 +540,12 @@ inline void bgc_fp64_quaternion_interpolate(BGC_FP64_Quaternion* interpolation,
 
 inline float bgc_fp32_quaternion_get_dot_product(const BGC_FP32_Quaternion* quaternion1, const BGC_FP32_Quaternion* quaternion2)
 {
-    return (quaternion1->s0 * quaternion2->s0 + quaternion1->x1 * quaternion2->x1) + (quaternion1->x2 * quaternion2->x2 + quaternion1->x3 * quaternion2->x3)
+    return (quaternion1->s0 * quaternion2->s0 + quaternion1->x1 * quaternion2->x1) + (quaternion1->x2 * quaternion2->x2 + quaternion1->x3 * quaternion2->x3);
 }
 
 inline double bgc_fp64_quaternion_get_dot_product(const BGC_FP64_Quaternion* quaternion1, const BGC_FP64_Quaternion* quaternion2)
 {
-    return (quaternion1->s0 * quaternion2->s0 + quaternion1->x1 * quaternion2->x1) + (quaternion1->x2 * quaternion2->x2 + quaternion1->x3 * quaternion2->x3)
+    return (quaternion1->s0 * quaternion2->s0 + quaternion1->x1 * quaternion2->x1) + (quaternion1->x2 * quaternion2->x2 + quaternion1->x3 * quaternion2->x3);
 }
 
 // ================= Conjugate ================== //
diff --git a/basic-geometry/rigid-pose3.h b/basic-geometry/rigid-pose3.h
index 10b1f3f..8e380ab 100644
--- a/basic-geometry/rigid-pose3.h
+++ b/basic-geometry/rigid-pose3.h
@@ -79,9 +79,9 @@ inline void bgc_fp32_rigid_pose3_convert_to_fp64(BGC_FP64_RigidPose3* destinatio
         _bgc_fp64_rigid_pose3_normalize(destination, square_magnitude);
     }
 
-    const double square_magnitude = bgc_fp64_quaternion_get_(&destination->_real_part);
+    const double dot_product = bgc_fp64_quaternion_get_dot_product(&destination->_real_part, &destination->_dual_part);
 
-    bgc_fp64_quaternion_subtract_scaled(&destination->_dual_part, &destination->_dual_part, &destination->_real_part);
+    bgc_fp64_quaternion_subtract_scaled(&destination->_dual_part, &destination->_dual_part, &destination->_real_part, dot_product);
 }
 
 inline void bgc_fp64_rigid_pose3_convert_to_fp32(BGC_FP32_RigidPose3* destination, const BGC_FP64_RigidPose3* source)
@@ -94,30 +94,54 @@ inline void bgc_fp64_rigid_pose3_convert_to_fp32(BGC_FP32_RigidPose3* destinatio
     if (!bgc_fp32_is_square_unit(square_magnitude)) {
         _bgc_fp32_rigid_pose3_normalize(destination, square_magnitude);
     }
+
+    const float dot_product = bgc_fp32_quaternion_get_dot_product(&destination->_real_part, &destination->_dual_part);
+
+    bgc_fp32_quaternion_subtract_scaled(&destination->_dual_part, &destination->_dual_part, &destination->_real_part, dot_product);
 }
 
 // ================== Combine =================== //
 
 inline void bgc_fp32_rigid_pose3_combine(BGC_FP32_RigidPose3* combination, const BGC_FP32_RigidPose3* first, const BGC_FP32_RigidPose3* second)
 {
-    bgc_fp32_dual_quaternion_multiply_by_dual_quaternion(&combination->_versor, &second->_versor, &first->_versor);
+    BGC_FP32_Quaternion dual_part1, dual_part2;
+
+    _bgc_fp32_restrict_quaternion_multiply_by_quaternion(&dual_part1, &second->_real_part, &first->_dual_part);
+    _bgc_fp32_restrict_quaternion_multiply_by_quaternion(&dual_part2, &second->_dual_part, &first->_real_part);
+
+    bgc_fp32_quaternion_multiply_by_quaternion(&combination->_real_part, &second->_real_part, &first->_real_part);
+    bgc_fp32_quaternion_add(&combination->_dual_part, &dual_part1, &dual_part2);
 
     const float square_magnitude = bgc_fp32_quaternion_get_square_magnitude(&combination->_real_part);
 
     if (!bgc_fp32_is_square_unit(square_magnitude)) {
         _bgc_fp32_rigid_pose3_normalize(combination, square_magnitude);
     }
+
+    const float dot_product = bgc_fp32_quaternion_get_dot_product(&combination->_real_part, &combination->_dual_part);
+
+    bgc_fp32_quaternion_subtract_scaled(&combination->_dual_part, &combination->_dual_part, &combination->_real_part, dot_product);
 }
 
 inline void bgc_fp64_rigid_pose3_combine(BGC_FP64_RigidPose3* combination, const BGC_FP64_RigidPose3* first, const BGC_FP64_RigidPose3* second)
 {
-    bgc_fp64_dual_quaternion_multiply_by_dual_quaternion(&combination->_versor, &second->_versor, &first->_versor);
+    BGC_FP64_Quaternion dual_part1, dual_part2;
+
+    _bgc_fp64_restrict_quaternion_multiply_by_quaternion(&dual_part1, &second->_real_part, &first->_dual_part);
+    _bgc_fp64_restrict_quaternion_multiply_by_quaternion(&dual_part2, &second->_dual_part, &first->_real_part);
+
+    bgc_fp64_quaternion_multiply_by_quaternion(&combination->_real_part, &second->_real_part, &first->_real_part);
+    bgc_fp64_quaternion_add(&combination->_dual_part, &dual_part1, &dual_part2);
 
     const double square_magnitude = bgc_fp64_quaternion_get_square_magnitude(&combination->_real_part);
 
     if (!bgc_fp64_is_square_unit(square_magnitude)) {
         _bgc_fp64_rigid_pose3_normalize(combination, square_magnitude);
     }
+
+    const double dot_product = bgc_fp64_quaternion_get_dot_product(&combination->_real_part, &combination->_dual_part);
+
+    bgc_fp64_quaternion_subtract_scaled(&combination->_dual_part, &combination->_dual_part, &combination->_real_part, dot_product);
 }
 
 #endif