Stylized-NextGen (In Development)

A stylized shader pipeline that integrating stylization into physically based rendering.

Shader Features

Listing some shader functionalities

Perspective Correction

Modifying the Projection Matrix in the vertex shader to translate the Perspective Projection to Orthographic Projection on specific materials based on a threshold. so the perspective removed object will be able to fit in normal perspective environment. Nice to have on anime/stylized rendering.

Stylized Rim

Standard: Inverted Fresnel with offset based on the light direction

Screen Space: screen space depth offset based on the view space light direction.

Stylized Diffuse Shading

Bands based ramp

Mihoyo Anime CG Rendering Layered Ramp Texture

Cel Shading

Stylized Specular Shading

Blinn Phong Specular with smoothstep, correctly remapped with roughness and metallic parameter

Isotropic/Anisotropic/Silk

Direct Lighting:

[2018] Call Of Duty: WWII Multi Scattering Diffuse BRDF

GGX Normal Distribution Function

Smith GGX Visibility Term

Fabric

Charlie Normal Distribution Function

Ashikhmin Visibility Term

Hair

Energy-Conserving Wrapped Cosine Lobe Diffuse

Two Layer KajiyaKay Strand Specular

Tangent Map

Environment Mapping

Isotropic Environment Mapping: Unity built-in approximation on UE split sum DFG LUT

Anisotropic Environment Mapping: using anisotropic modified normal as reflection vector

Cloth Environment Mapping: split sum DFG LUT for cloth

Refraction/Reflection

Custom CubeMap/ SphericalMap

Toony Interpolation

Thin Film (Iridescence)

Modified Iridescence BSDF

Reference: https://belcour.github.io/blog/research/publication/2017/05/01/brdf-thin-film.html

Clear Coat

Modified clearcoat BSDF

Hair Shadow

Screen Space Hair Shadow(Render Feature):

Use RenderFeature to generate the RT of a hair depth Pass (use Layer Mask to determine whether it is a hair part), and then use a uv pair in the lighting Pass to make an offset value according to the lighting direction It samples and compares it with the character's current depth, and the difference is the shadow of the hair.

Hand painted shadow with view space light direction UV offset :

Using UV offset to achieve hair shadows that change according to the direction of the light is also a better solution, but it is much better in performance than screen space hair shadows.

Skinned GPU Instancing Fur Shell

Unity exposed SkinnedMeshRenderer.GetVertexBuffer() API since Unity 2021.2.0, so that it is possible to get skinned VBO, and then use ByteAddressBuffer to pass it to Shader (because DX11 only allows Raw to pass VBO/IBO) by using DrawProcedural() in RenderFeature to achieve Skinned GPU Instancing.

SDF Shadow

Created by Collaborator

Subsurface Scattering

Modified SSS from GDCVault: Approximating Translucency for a Fast, Cheap and Convincing Subsurface Scattering Look

Modifications:

• Add a custom surface depth param into the back lit calculation,

• Add some modified Fresnel like equation on both front and back lit.

• Parallax Refraction

Matcap

Modified Matcap calculation to reduce to stretch at the viewing edge area

Outline

• View Space FOV applied constant width outline
• light space outline

Dither Fade

• Bayer 4x4
• Bayer 8x8
• Custom Dither Texture

Parallax Mapping

Some General Parallax Mapping Techniques: Used in Eye, Gem, Bump Materials

• Parallax Mapping
• Layered Parallax Mapping
• Relief Mapping
• Parallax Occlusion Mapping

Triplanar Projection

• Height Blending
• Object Space / World Space
• Normal Blending

TopDown Projection

• Height&Normal Angle Blending
• World Space Only

Unity Pipeline Tools

Generic Shader GUI

A general Shader GUI Framework in Unity, written in order to write minimal code and keep it flexible and easy to use. The combination of Unity Material Property Drawer API and additional regex based shader file analyzation.

Smooth Normal Baker

Using FBX SDK to modify fbx file to bake the smoothed normal into the vertex color or UV Channels for fixing outline breaking issue

Face SDF Generator

Custom Post Processing Framework

Based on URP RenderFeature, A buffer swapped postprocessing framework. Be able to insert custom post processing in custom render event.

Shader Generator

Generating shader based on the features used. It will strip all shader variants and replace with constant value.

DCC Pipeline Tools

Fur Shell Generator

A simple tool created in maya for batching furshell creation process

Shell Generation Process:

1. Duplicating Selected Mesh based on the assigned layer amount.
2. Vertex Painting on each Mesh based on the current layer index.
3. Combine these duplicated meshes, and cleanup history and scene.
4. Find the Root joint and bind it to the mesh skin through skin cluster.
5. Copy the skin weight from the source skin cluster to the combined skin cluster.
6. Delete source mesh