.. title: CG Class 22, Thurs 2019-11-14 .. slug: class22 .. date: 2019-11-14 .. tags: class .. category: .. link: .. description: .. type: text .. has_math: true .. sectnum:: .. contents:: Table of contents Week 12 slides ctd ------------------ #. `12_3 Graphical Objects and Scene Graphs `_. #. `12_4 Graphical Objects and Scene Graphs 2 `_. #. `12_5 Rendering overview `_. At this point we've learned enough WebGL. The course now switches to learn the fundamental graphics algorithms used in the *rasterizer* stage of the pipeline. Week 13 slides -------------- #. `13_1 Clipping `_. A lot of the material in the clipping slides is obsolete because machines are faster now. However perhaps the rendering is being done on a small coprocessor. Big idea (first mentioned in class 13): Given any orthogonal projection and clip volume, we transform the object so that we can view the new object with projection (x,y,z) -> (x,y,0) and clip volume (-1,-1,-1) to (1,1,1) **and get the same image**. That's a **normalization transformation**'. #. `13_2 Polygon rendering `_. Includes clipping polygons, hidden surface algorithms. Up to slide 22. Nice site on visualizing quaternions ------------------------------------ Lessons by Grant Sanderson, Technology by Ben Eater. `here `_