Games101 graphics P10 notes (geometry1)

Application of texture ：

1. Environment mapping ： Describe how the ambient light is , Store the ambient light on the map , You can use this map to render other things
   The circular map expansion may have distortion problems , The solution is to map to the cube

2. Bump （ normal ） Mapping ： It's not necessarily just about color , You can define the height （ Relative height ）, That is, the height difference of the texture relative to the point of the object itself
   You can define complex textures without changing geometric information , We use bump map to fake its height to simulate bump effect
3. 3d noise
4. Record the calculated information

The geometric

Geometry is divided into implicit geometry and explicit geometry
Implicit geometry ：
It means a certain relationship , Don't give practical points , such as x^2+y2+z^2=1, It represents a ball
shortcoming ： It's hard to see the form
advantage ： Judge whether a point is on this surface or It's easy inside and outside
Show Geometry ：
Show the points on the surface directly , Or use the method of parameter mapping , For example, use uv Mapping to x,y,z
shortcoming ： Judge whether a point is on the surface or It's difficult inside and outside