CS 5610/6610 - Spring 2022 - Interactive Computer Graphics

Project 6 - Environment Mapping

In this project we will implement simple environment mapping. This will include both the background and the reflections on objects.

Requirements

• Your program must take the name of the .obj file as its first command-line argument.
• The files for the cube-map images forming the background and the reflection environment can be hard-coded.
• You can use this cube-map image set for your tests. It is recommended that you use the y-up convention for this project, since this cube-map assumes y-up.
• Step 1: Display the background
  • Use one of the following background object types to display the background:
    • Option 1: One or two triangles that cover the entire camera view.
    • Option 2: A cube centered at the camera position. You can use this cube.obj file for the cube or hard-code its vertex positions.
  • Writing to the depth buffer must be disabled while drawing the background object.
  • Map the cube-map enviroment onto the background object, such that rotating the camera properly rotates the texture on the cubemap, producing an illusion of an environment.
• Step 2: Reflections on a sphere
  • Spheres are useful for debuging reflections. You can use this sphere.obj file for your tests.
  • The sphere must display reflections of the environment texture.
  • The reflections msust match the orientation of the camera.
    An example view of a sphere with reflections.
• Step 3: Reflections on objects
  • The final reflections must be combined with Blinn shading.
    Reflections combined with Blinn shading.
  • The reflections should be properly displaed on the given obj file. You can use this teapot.obj file for your tests, which includes a teapot model oriented such that y-axis is aligned with the up direction.
    Reflections with Blinn shading on a teapot.

Additional Requirements for CS 6610 Students

• Draw a plane with environment reflections underneath the object.
  Teapot with a plane.
• Use render-to-texture operations to produce the reflection of the teapot on the plane.
  Reflections of the teapot on the plane.