Shadow Generations Shaders - BlendDetail_dpndpnn

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Overview

Shader Behavior Overview

Shader model:

[2] Standard (PBR)
Does not support:

An advanced PBR shader that uses

distance blending to blend in a detail normal map
Vertex alpha to blend between two sets of albedo and PRM textures

It is essentially a combination of the Blend_dpndpn and Detail_dpnn shaders.

Related shaders

Behavior

Distance blending

Uses distance blending to interpolate

from the normal texture
to the normal and normal[2] textures blended together.

The shader uses detailDistance and detailFadeRange from the stage RFL to determine the detail range.

Vertex alpha blending

This shader has two sets of PBR textures:

diffuse and specular
diffuse[1] and specular[1]

The shader uses a blend factor to interpolate from the first set of textures to second one.
This blend factor consists of just the vertex alpha.

For the specular textures, the blend factor is used as is.
For the diffuse textures, the blend factor is multiplied by the diffuse[1] texture alpha.

Vertex Colors

Color is multiplied into the diffuse texture color
Alpha is used as the basis for the blend factor

Bugs

Warning

The shader has 3 normal texture slots: Only normal and normal[2] are used, with normal[1] left unused.

Yet, to be able to specify a texture for the normal[2] slot, a material must have 3 texture slots, even if the slot for normal[1] is empty.
In a similar vein, the shader has the enable_multi_tangent_space feature, but never makes use of it.

Speculation:

What likely happened here is that the developers used the code from Blend_dpndpn as a base and then added in the detail normal map logic from Detail_dpnn but accidentally pasted it over the previous normal map code, leaving just the detail normal map code behind.

Material Inputs

Textures


Name	Index	UV Index	Kind	Red	Green	Blue	Alpha
`diffuse`	0	0	Albedo	First Albedo color			N/A
`diffuse`	1	2	Albedo	Second Albedo color			Multiplied into the vertex alpha (blend factor), but only for when blending the two diffuse textures!
`specular`	0	0	PRM	First Specular factor; Gets multiplied by 0.25	First Smoothness factor	First Metallic factor	First Ambient Occlusion
`specular`	1	2	PRM	Second Specular factor; Gets multiplied by 0.25	Second Smoothness factor	Second Metallic factor	Second Ambient Occlusion
`normal`	0	0	Normal map	First Normal map direction		N/A	N/A
`normal`	1	N/A	N/A	Unused
`normal`	2	3	Detail Normal map	Detail Normal map direction		N/A	N/A

Parameters


Name	X	Y	Z	W
`DetailFactor`	UV scale for the `normal[2]` texture	N/A	N/A	N/A

Technical

Shader Features
`enable_multi_tangent_space`
`is_use_tex_srt_anim`
`is_use_gi_prt`
`is_use_gi_sg`
`is_use_gi`