GAMES101-08Shading2 (着色，管线，纹理渲染)

@[TOC](08Shading 1 (illumination,Shading and Graphics Pipeline))

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一、Shading 2(Shading,Pipeline and Texture Mapping)

高光：观察方向和镜面反射方向接近。半程向量是一种优化，简化计算


Ambient Term
Shading that does not depend on anything

• Add constant color to account for disregarded illumination and fill in black shadows
  
  
  Flat shading
• Triangle face is flat one normal vector
• Not good forsmooth surfaces

Gouraud shading

• lnterpolate colors from vertices across triangle
• Each vertex has a normal vector (how?)

Phong shading

• lnterpolate normalvectors across each triangle
• Compute full shading model at each pixel
• Not the Blinn-Phong Reflectance Model
  
  Defining Per-Vertex Normal Vectors
  

Barycentric interpolation (introducing soon)of vertex normals

Graphics (Real-time Rendering) Pipeline实时渲染管线



Snail Shader Program
lnigo Quilez, https://youtu.be/XuSnLbB1j6E

Texture Mapping

Surfaces are 2D
Surface lives in 3D world space
Every 3D surface point also has a place where it goes in the 2D image (texture).

均为（0，1）

纹理的无缝衔接，贴图