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Phong + : Shader Improvement Collection

You must launch the game from the Shader Modding Support Launcher (SMS Launcher). Otherwise the shaders will not compile properly!
https://steamcommunity.com/workshop/filedetails/?id=3410344592
See its workshops page for details usage information

Known compatibility issue: if you want to use the Cold War Alter 1971 mod, you must remove the shader folder from its gamlogic.pak. For some reason this mod(1971) carries an old copy of the goh shader file, causing shader files to be messed up and not compile properly.



This mod is a shader improvement mod designed to improve the rendering of Gate of Hell by modifying the code in the resource/shader folder.
It is fully compatible with the original shader, meaning that what is already there will not be broken by the added features.

• Physically based fresnel rim light
  
• Metal Simulation
  
• Emissive and Ambient Occlusion Mapping support

A global Fresnel rim light has been added, still controlled by rim light related settings and parameters.
The new rim light depends on the physically based algorithm,
and globally supports the following features:

1. Main directional light color affects rim light color
   
2. Shadow affects rim light brightness.

If the new mtl expression is replaced, the following features are also supported:

1. Specify pixel-by-pixel f0 (base reflectivity) characteristics from textures
   
2. Fresnel colors sampled from environment textures

Metallic simulation support has been added for mixing traditional phong specular highlight with metallic reflections via metallic masks.
The following features are specifically supported:

1. Specify pixel-by-pixel metallicity from textures
   
2. Metallic reflection color sampled from environment textures

Support for Emissive and Ambient Occlusion (AO) textures has been added.
The following features are supported:

1. Specify pixel-by-pixel Emissive intensity and AO intensity from textures
   
2. Calculate AO effects based on changes in light intensity

Features other than some of the Fresnel effects require the developer to update the mtl to obtain them.

New mtl and texture samples for preview images and testing can be found in the mod/resource/entity/misc/materials/phong+ folder.

When both of the following elements exist:

• {height "xxx"}
  
• {lightmap "xxx"}

The shader will activate new rendering feature support.

The height element, which was used for parallax mapping of ground textures, is now used for indexing environment textures.
The lightmap element, which was used for pre-baking lightmaps, is now used to store a four-channel mask map.

In addition, an extra parameter, {parallax_scale 00000}, is used to turn each shader feature on and off.


An environment texture is a texture that stores ambient light information, which we sample to obtain virtual ambient light.
The pre-made environment texture is stored in mod/resource/texture/common/envmap, which contains environment textures for six scenarios: spring, summer, fall, winter, desert, and night. The maps for the summer, fall, winter, desert, and night scenarios have been renamed to allow for automatic in-game switching.
These maps were obtained from Poly Haven via the CC0 License. We would like to thank the artist and the website for their selfless contributions!

You can simply index our preset textures via {height “$/envmap/env”}.

mask texture consists of four channels, which are represented as follows:

The recommended mask map suffix is mask, so the sample mtl element is: {lightmap “flak36_mask”}

When shader features are activated, it will be necessary to control the startup of the shader feature via the parallax_scale entry. (The default value of this parameter does not open any feature.)
We map each digit of this parameter to the on/off state of a feature, as follows:

So there are sample values as follows:
{parallax_scale 11110} Turn on all features.
{parallax_scale 1110} Turns on all features except metallic.
{parallax_scale 10000} Use only the metallic mask.
{parallax_scale 0} Special state, don't use it.

I will (sooooon!) be writing this on my website and github.

Special Thanks to

• @Aegon（Kiva） for modeling the sample material sphere and development help.
  
• @ordos for development help.
  
• Poly Haven thanks again for the free environment textures!
  
• All the authors of the rendering guides consulted during development.

for their contributions made during development!

If you like my work, please give this mod a positive rating, I'd appreciate it =)

If possible, you can directly support my work in the following ways:

Ko-Fi [ko-fi.com]

mbd [mbd.pub]