72 lines
1.3 KiB
Markdown
72 lines
1.3 KiB
Markdown
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---
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title: 《鸣潮》中的光线追踪：用光线构建动漫风格开放世界
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date: 2025-08-22 16:35:32
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excerpt:
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tags:
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rating: ⭐
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status: inprogress
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destination:
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share: false
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obsidianUIMode: source
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---
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# Rtx
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实现功能
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1. Rtx反射
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2. RtxGI
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3. RtxShadow
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# 选型&快速验证
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需求
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32km 32km
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二次元
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TOD
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4060 2k 60fps
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方案：
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1. ReSTIR
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2. Lumen（简略版，砍掉一些不需要的过程）
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1. GI
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2. Reflection
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3. 重新开发Clipmap Irradiance Cache来代替Surface Cache
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## ReSTIR
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1. 时间、空间重采样
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2. 计算光照
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3. 使用SHaRC、NRD降噪库。
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**SHaRC(Spatially Hashed Radiance Cache)**
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1. 解决Multi-Bounce Problem
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2. 基于世界空间稀疏哈希的Radiance Cache
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3. 默认只有2次反射
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**NRD(Nvidia Real-time Denoising)**
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1. 基于Spatio-Temporal的降噪器，开箱即用。
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2. 用于最终降噪输出。
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3. 性能消耗较高：4080 2k 2.3~3.0ms
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### 缺点：
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1. 实现起来简单，光照效果好，但带宽性能压力大。
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2. 远处、边缘有噪点。
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# 功能实现与迭代经验
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## ToonShading
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案例1：角色自阴影
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- 光栅化
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- 场景：CSM
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- 角色：PerObjectShadow
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- Rtx
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- 用剔除角色的InstanceMask做ToonShadowRay
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```c++
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if(IsToonShadingModel(ShadingModelID))
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{
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RayTracingMask |=RAY_TRACING_MASK_SHADOW_NOT_TOON;
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}
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```
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案例2：角色接入GI
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案例3：角色接入反射
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