Today's learning content mainly subdivision (Subdivision), thus ending the geometry of course, the next class will introduce the ray tracing ( preview content: Tiger Book - Chapter 4 (Ray Tracing) ), Yan teacher tracking light aspects have deep knowledge, let us wait and see the follow-up.
In addition, this class mention a big news, after a lapse of 32 years, computer graphics once again won the Turing Award, on Ed Catmulland Pat Hanrahantwo big brothers Introduction to Self-Discovery friends. Really great, and even today follow two masters course will learn the outcome of the matter.
He said an interesting, Yan teacher is very modest, subtle and relationships Pat Hanrahan said, ha ha, shook hands, had dinner, laughing. (Ha ha, I remember a little lecture notes not bad ~ ~), their relationship probably like this (which is our ancestral haha.):
A, Loop subdivision
Loop is a box spline promote secondary triangle by Charles Loop invention.
(A) Step:
- Increase the number of triangles
- Adjust the position of the triangle
can be made by Loop subdivision surface smoother and may represent more shapes.
(Ii) Calculation Method
For new vertex calculation method:
For the old vertex calculation:
Loop after the breakdown of the calculation results:
二、Catmull-Clark Subdivision (General Mesh)
Catmull-Clark is a generalization of bi-cubic B- spline.
Continue tomorrow more, because they can not sleep at night! The next day delay things, will lead to a vicious cycle.