feat(Attribute Manager): add possibility to copy the attribute of an element to another one

Author: BenPinet

include/geode/basic/attribute_manager.h

@@ -153,13 +153,20 @@ namespace geode
          */
         void assign_attribute_value( index_t from_element, index_t to_element );
 
+        /*!
+         * Copy attribute value from other value in the same attribute
+         * @param[in] from_element Attribute value to assign
+         * @param[in] to_element Where the value is assign
+         */
+        void copy_attribute_value( index_t from_element, index_t to_element );
         /*!
          * Interpolate attribute value from other values in the same attribute
          * @param[in] interpolation Attribute interpolator
          * @param[in] to_element Where the value is assign
          * @warning Only affect Attributes created with its AttributeProperties
          * interpolable flag set to true
          */
+
         void interpolate_attribute_value(
             const AttributeLinearInterpolation& interpolation,
             index_t to_element );

src/geode/basic/attribute_manager.cpp

@@ -101,6 +101,17 @@ namespace geode
             }
         }
 
+        void copy_attribute_value( index_t from_element,
+            index_t to_element,
+            const AttributeBase::AttributeKey &key )
+        {
+            for( auto &attribute_it : attributes_ )
+            {
+                attribute_it.second->compute_value(
+                    from_element, to_element, key );
+            }
+        }
+
         void interpolate_attribute_value(
             const AttributeLinearInterpolation &interpolation,
             index_t to_element,
@@ -367,6 +378,12 @@ namespace geode
         impl_->assign_attribute_value( from_element, to_element, {} );
     }
 
+    void AttributeManager::copy_attribute_value(
+        index_t from_element, index_t to_element )
+    {
+        impl_->copy_attribute_value( from_element, to_element, {} );
+    }
+
     void AttributeManager::interpolate_attribute_value(
         const AttributeLinearInterpolation &interpolation, index_t to_element )
     {

src/geode/model/helpers/detail/cut_along_internal_lines.cpp

@@ -27,6 +27,7 @@
 
 #include <absl/memory/memory.h>
 
+#include <geode/basic/attribute_manager.h>
 #include <geode/basic/pimpl_impl.h>
 
 #include <geode/geometry/point.h>
@@ -236,6 +237,8 @@ namespace geode
             {
                 const auto new_vertex_id =
                     builder.create_point( mesh.point( vertex_id ) );
+                mesh.vertex_attribute_manager().copy_attribute_value(
+                    vertex_id, new_vertex_id );
                 builder.replace_vertex( vertex_id, new_vertex_id );
                 for( const auto& polygon_vertex : polygon_vertices )
                 {

src/geode/model/helpers/detail/cut_along_internal_surfaces.cpp

@@ -27,6 +27,7 @@
 
 #include <absl/memory/memory.h>
 
+#include <geode/basic/attribute_manager.h>
 #include <geode/basic/pimpl_impl.h>
 
 #include <geode/geometry/point.h>
@@ -233,6 +234,8 @@ namespace geode
             {
                 const auto new_vertex_id =
                     builder.create_point( mesh.point( vertex_id ) );
+                mesh.vertex_attribute_manager().copy_attribute_value(
+                    vertex_id, new_vertex_id );
                 builder.replace_vertex( vertex_id, new_vertex_id );
                 for( const auto& polyhedron_vertex : polyhedron_vertices )
                 {