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虚实之道
Project Raven
吴民杰
Project Raven
是什么 ??????
Raven 是什么 ??????
技术小结
数据流 A – Camera tracking
Black Bird Hero Camera DCC
技术小结
数据流 B – Image based lighting
Black Bird DCC DCC
技术小结
Black Bird CG Car
Hero Camera DCC
DCC
Lighting data
Tracking data
进化 :
初衷 : 借助UE4 ,取景器中直接见到CG Car
进化 :
更上一层楼: 直接由UE4 ,制作生成商业广告视频,进而成为高端
影视级AR 解决方案
技术分析
Black Bird
Lighting data
Tracking data
Hero Camera
Hero
Camera
Image plate
CG Car
Background
技术分析
UE实现的功能
1 .Raw data import and processing i.e. NDI plugin, custom SDI UE4 plugin
2 .Camera tracking
3 .Relighting
4 .Composition
技术分析
UE中的实现
CG Car
Sky box for
lighting
Background
Composition
LOOK DEV
目的 :用以验证输入数据以及渲染引擎的正确性
手段 :由经校验过的参照照片做对比
LOOK DEV
关键校验数据
1. latlong
2 . Image plate
3 . 参照照片
4 . 摄影数据
LOOK DEV
latlong
LOOK DEV
Image plate
LOOK DEV
参照照片
LOOK DEV
如何获得参照
. 360度全包围,每45度拍摄一次
. 有车/没车,同一角度各拍摄一次,包围式曝光
. 拍摄 latlong
. 拍摄 Color chart + 18% grey card 锁定曝光白平衡
. 拍摄 Grey and chrome ball
LOOK DEV
参照物
LOOK DEV
参照物
LOOK DEV
参照物
LOOK DEV
获得参照照片
LOOK DEV
参照照片校正
1 .所有参照照片转成 32bit 线性文件
2 .包围曝光照片合成 HDR EXR文件
3 .根据参照物校色
LOOK DEV
导入校正参照文件进入UE
Look Dev
在UE中重构现场
Look Dev
在UE中重构灯光等
U
E
U
E
U
E
Look Dev
对每个材质进行全方位调教,对比
UE4参照照片
Look Dev
UE4参照照片
Rendering features
. Physically based dual normal clear coat shader
. Cos weight bent normal map based occlusion
. FFT Bloom
Raven - AR Demo
UE与皇家莎士比亚
UE与好莱坞
. Star War-Rogue One
致谢
问答

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