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+CSci 5607, Spring 2023
+Assignment 1c: Triangles and Texture
+Due: Friday March 3rd
+
+- [x] The program robustly accepts extended scene description files that include
+      texture images, texture coordinates and surface normal vectors. The
+      program is able to robustly handle triangle definitions that either
+      include or do not include per-vertex normal directions and include or do
+      not include per-vertex texture coordinates, in addition to vertex
+      locations. The syntax used to define textured and/or smooth-shaded
+      triangles follows the classic .obj format as described in class. (5 pts)
+
+- [x] The program correctly computes ray/plane intersections, and correctly
+      performs point-in-triangle testing using barycentric coordinates, enabling
+      the correct rendering of scenes containing triangles as well as spheres.
+      (20 pts)
+
+- [x] The program is capable of rendering triangles using flat shading, in which
+      every pixel in a triangle is assigned the same color, obtained by
+      correctly evaluating the Phong illumination equation using the unit length
+      normal of the plane in which the triangle lies. (10 pts)
+
+- [ ] The program is capable of rendering triangles using smooth shading, in
+      which every pixel within a triangle is assigned a unique color, obtained
+      by evaluating the Phong illumination equation using a unit length normal
+      direction correctly interpolated from the three normal directions defined
+      at the three triangle vertices. (15 pts)
+
+- [x] The program is capable of rendering textured spheres. An appropriate
+      texture coordinate is computed at each ray/sphere intersection point. This
+      can be done at runtime using a pre-defined, hard-coded algorithm. The
+      computed texture coordinate is used to retrieve a correctly corresponding
+      color from the associated texture map, which replaces the object’s diffuse
+      color in the Phong illumination model when it is evaluated at that point.
+      (25 pts)
+
+- [ ] The program is capable of rendering textured triangles. The texture
+      coordinate at the ray/triangle intersection point is correctly
+      interpolated from the texture coordinates defined at each of the three
+      triangle vertices. The interpolated texture coordinate is used to retrieve
+      a correctly corresponding color from the associated texture map, which
+      replaces the object’s diffuse color in the Phong illumination model when
+      it is evaluated at that point. (25 pts)
+
+- [ ] Extra credit: The program is capable of reading a normal map from a file
+      and correctly using the values in that map to appropriately vary the
+      surface normal direction used when calculating the Phone illumination
+      equation at each point across the surface. The normal mapping is capable
+      of being applied to both triangles and spheres. (7 pts)