pinhole camera
- near plane - far plane
- NDC: normalized device coordinate space
- 从 (0,0,0) 到 (1,1,1)
- 设备无关
- Raster space: NDC 乘以分辨率
- look-at Transformation
- Orthographic projection
- Perspective project
- 坐标系汇总
- World space：场景坐标系
- Object space：以物体为中心的坐标系
- Camera space：(orgin: camera position, z: viewing direction, y: updirection)
- Normalized device space
- Raster space: from (0,0,0) to (xRes, yRes, 1)
thin lens
- 薄透镜：光线只折射一次
- 光线
- Parallel Ray
- Focal Ray
- Chief Ray
- Depth of Field:the range of distances from the lens at which objects appear in focus
- Circle of confusion(coc)
- 五位空间采样
- x,y 采样
- u,v 透镜采样
- 时间采样
- 真实相机特有效果
- Vignetting 渐晕：亮度不均匀；打到一个透镜后，能量无法全部打到第二个透镜
- Distortion 镜头畸变（鱼眼镜头）
- Chromatic Aberration：不同颜色的光的折射率不同
- Bokeh 散焦：高光由于镜头原因出现散斑
- Lens Flare：拍特别亮的光源出现多组亮光；透镜出现反射 Interflection