Rename nib_offset to edge_index

QTProject/subdivision.cpp

@@ -146,7 +146,8 @@ Subdivision::Tables Subdivision::precomputeTables(Input input) {
     // for each triangle the edges of the neighbor triangles are stored.
     // First the edge shared with the triangles uv edge, then vw and wu.
     QMap<Triangle, QVector<Triangle::Edge>> opposite_edges;
-    unsigned int nib_offset = vb.length();//offset in new index buffer for edge vertices
+
+    unsigned int edge_index = vb.length();//offset in new index buffer for edge vertices
     for (int i = 0; i < triangles.length(); i++){
         //schaue alle dreiecke an
         Triangle triangle = triangles[i];
@@ -170,6 +171,14 @@ Subdivision::Tables Subdivision::precomputeTables(Input input) {
         }
 
         QVector<Triangle::Edge> opposite = opposite_edges.value(triangle);
+
+        // indices of the three vertices added to the edges of this triangle
+        unsigned int uv, vw, wu;
+
+        uv = edge_index++;
+        vw = edge_index++;
+        wu = edge_index++;
+
         tables.edge_indices.push_back(triangle.u_idx());
         tables.edge_indices.push_back(triangle.v_idx());
         tables.edge_indices.push_back(triangle.w_idx());
@@ -187,22 +196,20 @@ Subdivision::Tables Subdivision::precomputeTables(Input input) {
 
         //add indices to new index buffer
         tables.index_buffer.push_back(triangle.u_idx());
-        tables.index_buffer.push_back(nib_offset);
-        tables.index_buffer.push_back(nib_offset + 2);
+        tables.index_buffer.push_back(uv);
+        tables.index_buffer.push_back(wu);
 
         tables.index_buffer.push_back(triangle.v_idx());
-        tables.index_buffer.push_back(nib_offset + 1);
-        tables.index_buffer.push_back(nib_offset);
+        tables.index_buffer.push_back(vw);
+        tables.index_buffer.push_back(uv);
 
         tables.index_buffer.push_back(triangle.w_idx());
-        tables.index_buffer.push_back(nib_offset + 2);
-        tables.index_buffer.push_back(nib_offset + 1);
-
-        tables.index_buffer.push_back(nib_offset);
-        tables.index_buffer.push_back(nib_offset + 1);
-        tables.index_buffer.push_back(nib_offset + 2);
+        tables.index_buffer.push_back(wu);
+        tables.index_buffer.push_back(vw);
 
-        nib_offset += 3;
+        tables.index_buffer.push_back(uv);
+        tables.index_buffer.push_back(vw);
+        tables.index_buffer.push_back(wu);
     }
 
     qDebug()<<"Done with edge table. "<<tables.edge_indices.length();