John Tran
CS851 - Image Synthesis
Spring 2003

Assignment Zero

1. We measure a power spectrum along a ray.  (ie light)
2. BSDF 
3. Normals do not transform the same way that vectors do.  
4. IntersectP does not return a Surf object; it is simply a predicate 
   function that determines whethor or not an intersection occurs
5. Differential Geometry
   -3d hit point P
   -local coordinate system at the hit point, 
    given by the surface normal N and two tangent vectors S and T
   -parametric partial derivatives dP/du, and dP/dv
   -pointer to the Shape that the differential geometry lies on
6. Barycentric coordinates




Questions:
   1.  What physical quantity do we measure along a ray?
   2. What lrt class is used to describe the reflection of light at a point?
   3. How are vectors and normals treated differently?
   4. What's the difference between Intersect and IntersectP?
   5. What lrt class is used to describe the intersection between a ray and a shape?  Give a brief description of each field in this class.
   6. What kind of coordinates are used to parameterize a triangle?