/// <summary>
/// To the helix material.
/// </summary>
/// <param name="material">The material.</param>
/// <returns></returns>
/// <exception cref="System.NotSupportedException">Shading Mode {material.ShadingMode}</exception>
protected virtual KeyValuePair <global::Assimp.Material, MaterialCore> OnCreateHelixMaterial(global::Assimp.Material material)
{
MaterialCore core = null;
if (!material.HasShadingMode)
{
if (material.HasNonTextureProperty(GLTFMatKeys.AI_MATKEY_GLTF_METALLIC_FACTOR) ||
material.HasNonTextureProperty(GLTFMatKeys.AI_MATKEY_GLTF_ROUGHNESS_FACTOR) ||
material.HasNonTextureProperty(GLTFMatKeys.AI_MATKEY_GLTF_BASECOLOR_FACTOR))
{
material.ShadingMode = ShadingMode.Fresnel;
}
else if (material.HasColorSpecular || material.HasColorDiffuse || material.HasTextureDiffuse)
{
material.ShadingMode = ShadingMode.Blinn;
}
else
{
material.ShadingMode = ShadingMode.Gouraud;
}
}
var mode = material.ShadingMode;
if (Configuration.ImportMaterialType != MaterialType.Auto)
{
switch (Configuration.ImportMaterialType)
{
case MaterialType.BlinnPhong:
mode = ShadingMode.Blinn;
break;
case MaterialType.Diffuse:
mode = ShadingMode.Gouraud;
break;
case MaterialType.PBR:
mode = ShadingMode.Fresnel;
break;
case MaterialType.VertexColor:
core = new ColorMaterialCore();
break;
case MaterialType.Normal:
core = new NormalMaterialCore();
break;
case MaterialType.Position:
core = new PositionMaterialCore();
break;
}
}
if (core == null)
{
switch (mode)
{
case ShadingMode.Blinn:
case ShadingMode.Phong:
case ShadingMode.None:
core = OnCreatePhongMaterial(material);
break;
case ShadingMode.CookTorrance:
case ShadingMode.Fresnel:
case ShadingMode.OrenNayar:
core = OnCreatePBRMaterial(material);
break;
case ShadingMode.Gouraud:
var diffuse = new DiffuseMaterialCore
{
DiffuseColor = material.ColorDiffuse.ToSharpDXColor4()
};
if (material.HasOpacity)
{
var c = diffuse.DiffuseColor;
c.Alpha = material.Opacity;
diffuse.DiffuseColor = c;
}
if (material.HasTextureDiffuse)
{
diffuse.DiffuseMap = LoadTexture(material.TextureDiffuse.FilePath);
diffuse.DiffuseMapFilePath = material.TextureDiffuse.FilePath;
}
if (material.ShadingMode == ShadingMode.Flat)
{
diffuse.EnableFlatShading = true;
}
core = diffuse;
break;
case ShadingMode.Flat:
core = OnCreatePhongMaterial(material);
if (core is PhongMaterialCore p)
{
p.EnableFlatShading = true;
}
break;
default:
switch (Configuration.ImportMaterialType)
{
case MaterialType.Position:
core = new PositionMaterialCore();
break;
case MaterialType.Normal:
core = new NormalMaterialCore();
break;
default:
Log(HelixToolkit.Logger.LogLevel.Warning, $"Shading Mode is not supported:{material.ShadingMode}");
core = new DiffuseMaterialCore()
{
DiffuseColor = Color.Red, EnableUnLit = true
};
break;
}
break;
}
}
if (core != null)
{
core.Name = string.IsNullOrEmpty(material.Name) ? $"Material_{Interlocked.Increment(ref MaterialIndexForNoName)}" : material.Name;
}
return(new KeyValuePair <global::Assimp.Material, MaterialCore>(material, core));
}
/// <summary>
/// To the phong material.
/// </summary>
/// <param name="material">The material.</param>
/// <returns></returns>
protected virtual PhongMaterialCore OnCreatePhongMaterial(global::Assimp.Material material)
{
var phong = new PhongMaterialCore
{
AmbientColor = (material.HasColorAmbient && !configuration.IgnoreAmbientColor) ? material.ColorAmbient.ToSharpDXColor4() : Color.Black,
DiffuseColor = material.HasColorDiffuse ? material.ColorDiffuse.ToSharpDXColor4() : Color.White,
SpecularColor = material.HasColorSpecular ? material.ColorSpecular.ToSharpDXColor4() : Color.Black,
EmissiveColor = (material.HasColorEmissive && !configuration.IgnoreEmissiveColor) ? material.ColorEmissive.ToSharpDXColor4() : Color.Black,
ReflectiveColor = material.HasColorReflective
? material.ColorReflective.ToSharpDXColor4()
: Color.Black,
SpecularShininess = material.Shininess
};
if (material.HasOpacity)
{
var c = phong.DiffuseColor;
c.Alpha = material.Opacity;
phong.DiffuseColor = c;
}
if (material.HasTextureDiffuse)
{
phong.DiffuseMap = LoadTexture(material.TextureDiffuse.FilePath);
phong.DiffuseMapFilePath = material.TextureDiffuse.FilePath;
var desc = Shaders.DefaultSamplers.LinearSamplerClampAni1;
desc.AddressU = ToDXAddressMode(material.TextureDiffuse.WrapModeU);
desc.AddressV = ToDXAddressMode(material.TextureDiffuse.WrapModeV);
phong.DiffuseMapSampler = desc;
}
if (material.HasTextureNormal)
{
phong.NormalMap = LoadTexture(material.TextureNormal.FilePath);
phong.NormalMapFilePath = material.TextureNormal.FilePath;
}
else if (material.HasTextureHeight)
{
phong.NormalMap = LoadTexture(material.TextureHeight.FilePath);
phong.NormalMapFilePath = material.TextureHeight.FilePath;
}
if (material.HasTextureSpecular)
{
phong.SpecularColorMap = LoadTexture(material.TextureSpecular.FilePath);
phong.SpecularColorMapFilePath = material.TextureSpecular.FilePath;
}
if (material.HasTextureDisplacement)
{
phong.DisplacementMap = LoadTexture(material.TextureDisplacement.FilePath);
phong.DisplacementMapFilePath = material.TextureDisplacement.FilePath;
}
if (material.HasTextureOpacity)
{
phong.DiffuseAlphaMap = LoadTexture(material.TextureOpacity.FilePath);
phong.DiffuseAlphaMapFilePath = material.TextureOpacity.FilePath;
}
if (material.HasTextureEmissive)
{
phong.EmissiveMap = LoadTexture(material.TextureEmissive.FilePath);
phong.EmissiveMapFilePath = material.TextureEmissive.FilePath;
}
if (material.HasNonTextureProperty(AiMatKeys.UVTRANSFORM_BASE))
{
var values = material.GetNonTextureProperty(AiMatKeys.UVTRANSFORM_BASE).GetFloatArrayValue();
if (values != null && values.Length == 5)
{
phong.UVTransform = new UVTransform(values[0], new Vector2(values[1], values[2]), new Vector2(values[3], values[4]));
}
}
return(phong);
}
/// <summary>
/// To the PBR material.
/// </summary>
/// <param name="material">The material.</param>
/// <returns></returns>
protected virtual PBRMaterialCore OnCreatePBRMaterial(global::Assimp.Material material)
{
var pbr = new PBRMaterialCore
{
AlbedoColor = material.HasColorDiffuse ? material.ColorDiffuse.ToSharpDXColor4() : Color.Black,
EmissiveColor = material.HasColorEmissive && !Configuration.IgnoreEmissiveColor
? material.ColorEmissive.ToSharpDXColor4()
: Color.Black,
};
if (material.HasNonTextureProperty(GLTFMatKeys.AI_MATKEY_GLTF_BASECOLOR_FACTOR))
{
pbr.AlbedoColor = material.GetNonTextureProperty(GLTFMatKeys.AI_MATKEY_GLTF_BASECOLOR_FACTOR)
.GetColor4DValue().ToSharpDXColor4();
}
if (material.HasNonTextureProperty(GLTFMatKeys.AI_MATKEY_GLTF_METALLIC_FACTOR))
{
pbr.MetallicFactor = material.GetNonTextureProperty(GLTFMatKeys.AI_MATKEY_GLTF_METALLIC_FACTOR)
.GetFloatValue();
}
if (material.HasColorAmbient)
{
pbr.AmbientOcclusionFactor = material.ColorAmbient.R;
}
if (material.HasNonTextureProperty(GLTFMatKeys.AI_MATKEY_GLTF_ROUGHNESS_FACTOR))
{
pbr.RoughnessFactor = material.GetNonTextureProperty(GLTFMatKeys.AI_MATKEY_GLTF_METALLIC_FACTOR)
.GetFloatValue();
}
else if (material.HasColorSpecular && material.HasShininess)
{
//Ref https://github.com/assimp/assimp/blob/master/code/glTF2Exporter.cpp
float specularIntensity = material.ColorSpecular.R * 0.2125f
+ material.ColorSpecular.G * 0.7154f + material.ColorSpecular.B * 0.0721f;
float normalizedShininess = (float)Math.Sqrt(material.Shininess / 1000);
normalizedShininess = Math.Min(Math.Max(normalizedShininess, 0), 1f);
normalizedShininess *= specularIntensity;
pbr.RoughnessFactor = 1 - normalizedShininess;
}
if (material.HasNonTextureProperty(GLTFMatKeys.AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS))
{
var hasGlossiness = material.GetNonTextureProperty(GLTFMatKeys.AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS).GetBooleanValue();
if (hasGlossiness)
{
if (material.HasNonTextureProperty(GLTFMatKeys.AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_GLOSSINESS_FACTOR))
{
pbr.ReflectanceFactor = material.GetNonTextureProperty(GLTFMatKeys.AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_GLOSSINESS_FACTOR).GetFloatValue();
}
else if (material.HasShininess)
{
pbr.ReflectanceFactor = material.Shininess / 1000;
}
}
}
if (material.HasOpacity)
{
var c = pbr.AlbedoColor;
c.Alpha = material.Opacity;
pbr.AlbedoColor = c;
}
if (material.HasTextureDiffuse)
{
pbr.AlbedoMap = LoadTexture(material.TextureDiffuse.FilePath);
pbr.AlbedoMapFilePath = material.TextureDiffuse.FilePath;
var desc = Shaders.DefaultSamplers.LinearSamplerClampAni1;
desc.AddressU = ToDXAddressMode(material.TextureDiffuse.WrapModeU);
desc.AddressV = ToDXAddressMode(material.TextureDiffuse.WrapModeV);
pbr.SurfaceMapSampler = desc;
}
if (material.HasTextureNormal)
{
pbr.NormalMap = LoadTexture(material.TextureNormal.FilePath);
pbr.NormalMapFilePath = material.TextureNormal.FilePath;
}
else if (material.HasTextureHeight)
{
pbr.NormalMap = LoadTexture(material.TextureHeight.FilePath);
pbr.NormalMapFilePath = material.TextureHeight.FilePath;
}
if (material.HasProperty(GLTFMatKeys.AI_MATKEY_GLTF_METALLICROUGHNESSAO_TEXTURE, TextureType.Unknown, 0))
{
var t = material.GetProperty(GLTFMatKeys.AI_MATKEY_GLTF_METALLICROUGHNESSAO_TEXTURE,
TextureType.Unknown, 0);
pbr.RoughnessMetallicMap = LoadTexture(t.GetStringValue());
pbr.RoughnessMetallicMapFilePath = t.GetStringValue();
}
else if (material.HasTextureSpecular)
{
pbr.RoughnessMetallicMap = LoadTexture(material.TextureSpecular.FilePath);
pbr.RoughnessMetallicMapFilePath = material.TextureSpecular.FilePath;
}
if (material.HasTextureDisplacement)
{
pbr.DisplacementMap = LoadTexture(material.TextureDisplacement.FilePath);
pbr.DisplacementMapFilePath = material.TextureDisplacement.FilePath;
}
if (material.HasTextureLightMap)
{
pbr.AmbientOcculsionMap = LoadTexture(material.TextureLightMap.FilePath);
pbr.AmbientOcculsionMapFilePath = material.TextureLightMap.FilePath;
}
if (material.HasTextureEmissive)
{
pbr.EmissiveMap = LoadTexture(material.TextureEmissive.FilePath);
pbr.EmissiveMapFilePath = material.TextureEmissive.FilePath;
}
if (material.HasNonTextureProperty(AiMatKeys.UVTRANSFORM_BASE))
{
var values = material.GetNonTextureProperty(AiMatKeys.UVTRANSFORM_BASE).GetFloatArrayValue();
if (values != null && values.Length == 5)
{
pbr.UVTransform = new UVTransform(values[0], new Vector2(values[1], values[2]), new Vector2(values[3], values[4]));
}
}
return(pbr);
}