task4

homeworks/hw2/index.html

@@ -354,28 +354,42 @@ <h3>Task 3: Area-Weighted Vertex Normals</h3>
  <div class="taskbox-outer" id="task-4">
  <div class="taskbox-inner">
  <div class="text-center taskdiv">
- <h3>Task 4: _</h3>
+ <h3>Task 4: Edge Flip</h3>
  </div>
 
  <div class="text-start taskp mt-4 mb-5">
- <p>summary</p>
- <p>explain</p>
+ <p>
+ In this task, we implemented a remashing operation on an edge. This
+ operation flips an edge by changing its two endpoints, or vertices,
+ to another pair of vertices.
+ </p>
+ <p>
+ To implement this, we wrote down a list of all elements: half-edges,
+ vertices, edges, and faces in a simple mesh. The simple mesh
+ consists of two triangles glued together by a half-edge. This list
+ of elements represents what the elements were originally pointing to
+ before the flip operation. This list is important because it ensures
+ that we do not forget to reassign the pointers after the flip
+ operation. Finally, we perform the flip operation by changing the
+ given edge's two vertices to the other two vertices in the simple
+ mesh and reassigning all pointers.
+ </p>
 
  <br />
 
  <div align="middle">
  <table style="width=100%">
  <tr>
  <td>
- <img src="task3.png" align="middle" width="400px" />
+ <img src="task3.png" align="middle" width="360px" />
  <figcaption class="figcaption" align="middle">
- Teapot without shading (without vertex normals)
+ Teapot before any flip operation
  </figcaption>
  </td>
  <td>
- <img src="task3shading.png" align="middle" width="400px" />
+ <img src="task4.png" align="middle" width="400px" />
  <figcaption class="figcaption" align="middle">
- Teapot with shading
+ Teapot after some flip operations
  </figcaption>
  </td>
  </tr>
@@ -517,10 +531,9 @@ <h3>Task 6: Loop Subdivision for Mesh Upsampling</h3>
 
  <p>
  After loop subdivision, sharp corners and edges become smoother
- since the number of polygons in the mesh are increased. You cannot
- reduce this effect by pre-splitting some edges because pre-splitting
- creates new edges and therefore more polygons although less polygons
- created compared to loop subdivision.
+ since the number of polygons in the mesh are increased. You can
+ reduce this effect by pre-splitting edges near the sharp corners and
+ edges.
  </p>
 
  <p>