DebugEffect

DirectXTK	Effects

This effect provides a way to visualize normals, tangents, and binormals/bitangents for debugging purposes. This effect also supports GPU instancing.

Related tutorials: Using advanced shaders, Multistream rendering and instancing

classDiagram
class Mode{
    <<enumeration>>
    Mode_Default
    Mode_Normals
    Mode_Tangents
    Mode_BiTangents
}
class IEffect{
    <<Interface>>
    +Apply()
    +GetVertexShaderBytecode()
}
class IEffectMatrices{
    <<Interface>>
    +SetWorld()
    +SetView()
    +SetProjection()
    +SetMatrices()
}
class DebugEffect{
    +SetMode()
    +SetHemisphericalAmbientColor()
    +SetAlpha()
    +SetVertexColorEnabled()
    +SetBiasedVertexNormals()
    +SetInstancingEnabled()
}
DebugEffect  .. Mode
DebugEffect --|> IEffect
DebugEffect --|> IEffectMatrices

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Header

#include <Effects.h>

Initialization

Construction requires a Direct3D 11 device.

std::unique_ptr<Debugffect> effect;

effect = std::make_unique<DebugEffect>(device);

For exception safety, it is recommended you make use of the C++ RAII pattern and use a std::unique_ptr or std::shared_ptr

Interfaces

PBREffect supports IEffect and IEffectMatrices.

Input layout

This effect requires SV_Position, NORMAL, and TEXCOORD0. If per-vertex colors are enabled, it also requires COLOR.

If instancing is enabled, this effect also requires these vertex elements:

"InstMatrix",  0, DXGI_FORMAT_R32G32B32A32_FLOAT
"InstMatrix",  1, DXGI_FORMAT_R32G32B32A32_FLOAT
"InstMatrix",  2, DXGI_FORMAT_R32G32B32A32_FLOAT

Properties

• SetMode: Sets which debug shader to use. Defaults to Mode_Default:

Mode_Default	Hemispherical ambient lighting
Mode_Normals	RGB normals
Mode_Tangents	RGB tangents
Mode_BiTangents	RGB bi-tangents (a.k.a. binormals)

• SetAlpha: Sets the alpha (transparency) of the effect. Defaults to 1 (fully opaque).

• SetHemisphericalAmbientColor: The default mode uses a simple hemispherical ambient lighting so you can see the object with some 3D clues regardless of overall scene lighting. It defaults to using White to Black. This property can set different upper/lower colors.

• SetVertexColorEnabled: Enables per-vertex color. Defaults to false. Modifying this setting requires recreating associated input layouts, and enabling it requires COLOR.

• SetBiasedVertexNormals: Enables support for compressed vertex normals which require *2 - 1 biasing at runtime such as DXGI_FORMAT_R10G10B10A2_UNORM.

• SetInstancingEnabled: Enables support for per-vertex instancing by adding a per-vertex XMFLOAT3X4 transform matrix.

Feature Level Notes

This effect uses Shader Model 4.0 so requires Direct3D hardware feature level 10.0 or greater.

Direct3D feature levels

Further reading

Christian Schüler, "Normal Mapping without Precomputed Tangents", ShaderX 5, Chapter 2.6, pp. 131 – 140 and this blog post