Shadow Generations Shaders - DirectionBlend dpndpnn

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Overview

Shader Behavior Overview

Shader model:

   [2] Standard (PBR)
Does not support:

• Transparent mesh layer
• Noise

An advanced PBR shader that

• uses directional blending to interpolate between two texture sets
• blends an extra normal map textures into the other normal maps.

This shader is essentially a modification of the DirectionBlend_dpndpn shader.

Related shaders

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

Behavior

Extra Normal Map

The normal[2] texture is blended into the normal and normal[1] textures before their usage.

Directional blending

This shader has two sets of PBR textures:

• diffuse, specular and normal
• diffuse[1], specular[1] and normal[1]

The shader uses a blend factor to interpolate from the first set of textures to second one.
This blend factor is calculated using directional blending.

This involves various inputs:

Input	Description
Normal map	The normal texture is applied to the normal direction before calculating the directional blend factor
Red vertex color channel	The directional blend bias
DirectionParam parameter	The directional blend direction
NormalBlendParam parameter	The Directional blend intensity and offset
diffuse and diffuse[1] (multiplied together)	The Directional blend limit

Transparency

(For some reason) the directional blend factor is used for the transparency, and not any of the diffuse textures alpha channels, which makes for limited use cases.

Vertex Colors

• The colors...
  • Red channel is used as the directional blend bias
  • Green and blue channels are unused
• Alpha is unused

Material Inputs

Textures

Name	Index	UV Index	Kind	Red	Green	Blue	Alpha
diffuse	0	Any	Albedo	First Albedo color			directional blend limit
diffuse	1	Any	Albedo	Second Albedo color			directional blend limit
specular	0	Any	PRM	First Specular factor; Gets multiplied by 0.25	First Smoothness factor	First Metallic factor	First Ambient Occlusion
specular	1	Any	PRM	Second Specular factor; Gets multiplied by 0.25	Second Smoothness factor	Second Metallic factor	Second Ambient Occlusion
normal	0	Any	Normal map	First Normal map direction		N/A	N/A
normal	1	Any	Normal map	Second Normal map direction		N/A	N/A
normal	2	Any	Normal map	Extra Normal map direction that is blended into the other normal maps		N/A	N/A

Parameters

Name	X	Y	Z	W
DirectionParam	Directional blend direction			N/A
NormalBlendParam	Directional blend intensity	Directional blend offset	N/A	N/A

Technical

Shader Features
is_compute_instancing
is_use_tex_srt_anim
enable_alpha_threshold
is_use_gi_prt
is_use_gi_sg
is_use_gi