Shadow Generations Shaders - BlendDetail dpndpnn

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Overview

Shader Behavior Overview

Shader model:

   [2] Standard (PBR)
Does not support:

• Punch-through mesh layer
• Transparent mesh layer
• Noise
• Compute instancing

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

• Blend_dpndpn
• Blend_dpnbdpn
• BlendDetail_dndnd
• Detail_dpndpn
• Detail_dpnn
• DirectionBlend_dpndpn
• DirectionBlend_dpndpnn
• DirectionBlend_dpnndpn
• DistanceBlend_dpn

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.

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.

Vertex Colors

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

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_gi_prt
is_use_gi_sg
is_use_gi