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Merge pull request #1503 from Matter-and-Form/gltf2-materials 

glTF2 Material Improvements
pull/1516/head
Kim Kulling 2017-10-24 11:08:31 +02:00 committed by GitHub
parent 6d98f82440 bfa33b50ad
commit 92046319be
4 changed files with 83 additions and 23 deletions
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6
code/glTF2Asset.h
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@ -164,17 +164,15 @@ namespace glTF2
//! Magic number for GLB files
#define AI_GLB_MAGIC_NUMBER "glTF"
#define AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_BASE_COLOR_FACTOR "$mat.gltf.pbrMetallicRoughness.baseColorFactor", 0, 0
#define AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_METALLIC_FACTOR "$mat.gltf.pbrMetallicRoughness.metallicFactor", 0, 0
#define AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_ROUGHNESS_FACTOR "$mat.gltf.pbrMetallicRoughness.roughnessFactor", 0, 0
#define AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_BASE_COLOR_TEXTURE aiTextureType_DIFFUSE, 1
#define AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_METALLICROUGHNESS_TEXTURE aiTextureType_UNKNOWN, 0
#define AI_MATKEY_GLTF_ALPHAMODE "$mat.gltf.alphaMode", 0, 0
#define AI_MATKEY_GLTF_ALPHACUTOFF "$mat.gltf.alphaCutoff", 0, 0
#define AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS "$mat.gltf.pbrSpecularGlossiness", 0, 0
#define AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_DIFFUSE_FACTOR "$clr.diffuse", 0, 1
#define AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_SPECULAR_FACTOR "$clr.specular", 0, 1
#define AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_GLOSSINESS_FACTOR "$mat.gltf.pbrMetallicRoughness.glossinessFactor", 0, 0
#define AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_DIFFUSE_TEXTURE aiTextureType_DIFFUSE, 1
#define AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_SPECULARGLOSSINESS_TEXTURE aiTextureType_UNKNOWN, 1
#define _AI_MATKEY_GLTF_TEXTURE_TEXCOORD_BASE "$tex.file.texCoord"
#define _AI_MATKEY_GLTF_MAPPINGNAME_BASE "$tex.mappingname"

71
code/glTF2Exporter.cpp
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@ -372,20 +372,28 @@ void glTF2Exporter::GetMatTex(const aiMaterial* mat, OcclusionTextureInfo& prop,
}
}
void glTF2Exporter::GetMatColor(const aiMaterial* mat, vec4& prop, const char* propName, int type, int idx)
aiReturn glTF2Exporter::GetMatColor(const aiMaterial* mat, vec4& prop, const char* propName, int type, int idx)
{
aiColor4D col;
if (mat->Get(propName, type, idx, col) == AI_SUCCESS) {
aiReturn result = mat->Get(propName, type, idx, col);
if (result == AI_SUCCESS) {
prop[0] = col.r; prop[1] = col.g; prop[2] = col.b; prop[3] = col.a;
}
return result;
}
void glTF2Exporter::GetMatColor(const aiMaterial* mat, vec3& prop, const char* propName, int type, int idx)
aiReturn glTF2Exporter::GetMatColor(const aiMaterial* mat, vec3& prop, const char* propName, int type, int idx)
{
aiColor3D col;
if (mat->Get(propName, type, idx, col) == AI_SUCCESS) {
aiReturn result = mat->Get(propName, type, idx, col);
if (result == AI_SUCCESS) {
prop[0] = col.r; prop[1] = col.g; prop[2] = col.b;
}
return result;
}
void glTF2Exporter::ExportMaterials()
@ -406,16 +414,49 @@ void glTF2Exporter::ExportMaterials()
m->name = name;
GetMatTex(mat, m->pbrMetallicRoughness.baseColorTexture, AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_BASE_COLOR_TEXTURE);
if (!m->pbrMetallicRoughness.baseColorTexture.texture) {
//if there wasn't a baseColorTexture defined in the source, fallback to any diffuse texture
GetMatTex(mat, m->pbrMetallicRoughness.baseColorTexture, aiTextureType_DIFFUSE);
}
GetMatTex(mat, m->pbrMetallicRoughness.metallicRoughnessTexture, AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_METALLICROUGHNESS_TEXTURE);
if (GetMatColor(mat, m->pbrMetallicRoughness.baseColorFactor, AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_BASE_COLOR_FACTOR) != AI_SUCCESS) {
// if baseColorFactor wasn't defined, then the source is likely not a metallic roughness material.
//a fallback to any diffuse color should be used instead
GetMatColor(mat, m->pbrMetallicRoughness.baseColorFactor, AI_MATKEY_COLOR_DIFFUSE);
}
if (mat->Get(AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_METALLIC_FACTOR, m->pbrMetallicRoughness.metallicFactor) != AI_SUCCESS) {
//if metallicFactor wasn't defined, then the source is likely not a PBR file, and the metallicFactor should be 0
m->pbrMetallicRoughness.metallicFactor = 0;
}
mat->Get(AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_ROUGHNESS_FACTOR, m->pbrMetallicRoughness.roughnessFactor);
// get roughness if source is gltf2 file
if (mat->Get(AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_ROUGHNESS_FACTOR, m->pbrMetallicRoughness.roughnessFactor) != AI_SUCCESS) {
// otherwise, try to derive and convert from specular + shininess values
aiColor4D specularColor;
ai_real shininess;
if (
mat->Get(AI_MATKEY_COLOR_SPECULAR, specularColor) == AI_SUCCESS &&
mat->Get(AI_MATKEY_SHININESS, shininess) == AI_SUCCESS
) {
// convert specular color to luminance
float specularIntensity = specularColor[0] * 0.2125 + specularColor[1] * 0.7154 + specularColor[2] * 0.0721;
float roughnessFactor = 1 - std::sqrt(shininess / 1000);
roughnessFactor = std::pow(roughnessFactor, 2);
roughnessFactor = std::min(std::max(roughnessFactor, 0.0f), 1.0f);
// low specular intensity values should produce a rough material even if shininess is high.
roughnessFactor = 1 - (roughnessFactor * specularIntensity);
m->pbrMetallicRoughness.roughnessFactor = roughnessFactor;
}
}
GetMatTex(mat, m->normalTexture, aiTextureType_NORMALS);
GetMatTex(mat, m->occlusionTexture, aiTextureType_LIGHTMAP);
@ -434,7 +475,7 @@ void glTF2Exporter::ExportMaterials()
if (mat->Get(AI_MATKEY_OPACITY, opacity) == AI_SUCCESS) {
if (opacity < 1) {
m->alphaMode = "MASK";
m->alphaMode = "BLEND";
m->pbrMetallicRoughness.baseColorFactor[3] *= opacity;
}
}
@ -451,11 +492,19 @@ void glTF2Exporter::ExportMaterials()
PbrSpecularGlossiness pbrSG;
GetMatColor(mat, pbrSG.diffuseFactor, AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_DIFFUSE_FACTOR);
GetMatColor(mat, pbrSG.specularFactor, AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_SPECULAR_FACTOR);
mat->Get(AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_GLOSSINESS_FACTOR, pbrSG.glossinessFactor);
GetMatTex(mat, pbrSG.diffuseTexture, AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_DIFFUSE_TEXTURE);
GetMatTex(mat, pbrSG.specularGlossinessTexture, AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_SPECULARGLOSSINESS_TEXTURE);
GetMatColor(mat, pbrSG.diffuseFactor, AI_MATKEY_COLOR_DIFFUSE);
GetMatColor(mat, pbrSG.specularFactor, AI_MATKEY_COLOR_SPECULAR);
if (mat->Get(AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_GLOSSINESS_FACTOR, pbrSG.glossinessFactor) != AI_SUCCESS) {
float shininess;
if (mat->Get(AI_MATKEY_SHININESS, shininess)) {
pbrSG.glossinessFactor = shininess / 1000;
}
}
GetMatTex(mat, pbrSG.diffuseTexture, aiTextureType_DIFFUSE);
GetMatTex(mat, pbrSG.specularGlossinessTexture, aiTextureType_SPECULAR);
m->pbrSpecularGlossiness = Nullable<PbrSpecularGlossiness>(pbrSG);
}

4
code/glTF2Exporter.h
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@ -115,8 +115,8 @@ namespace Assimp
void GetMatTex(const aiMaterial* mat, glTF2::TextureInfo& prop, aiTextureType tt, unsigned int slot);
void GetMatTex(const aiMaterial* mat, glTF2::NormalTextureInfo& prop, aiTextureType tt, unsigned int slot);
void GetMatTex(const aiMaterial* mat, glTF2::OcclusionTextureInfo& prop, aiTextureType tt, unsigned int slot);
void GetMatColor(const aiMaterial* mat, glTF2::vec4& prop, const char* propName, int type, int idx);
void GetMatColor(const aiMaterial* mat, glTF2::vec3& prop, const char* propName, int type, int idx);
aiReturn GetMatColor(const aiMaterial* mat, glTF2::vec4& prop, const char* propName, int type, int idx);
aiReturn GetMatColor(const aiMaterial* mat, glTF2::vec3& prop, const char* propName, int type, int idx);
void ExportMetadata();
void ExportMaterials();
void ExportMeshes();

21
code/glTF2Importer.cpp
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@ -228,11 +228,19 @@ void glTF2Importer::ImportMaterials(glTF2::Asset& r)
}
SetMaterialColorProperty(r, mat.pbrMetallicRoughness.baseColorFactor, aimat, AI_MATKEY_COLOR_DIFFUSE);
SetMaterialColorProperty(r, mat.pbrMetallicRoughness.baseColorFactor, aimat, AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_BASE_COLOR_FACTOR);
SetMaterialTextureProperty(embeddedTexIdxs, r, mat.pbrMetallicRoughness.baseColorTexture, aimat, aiTextureType_DIFFUSE);
SetMaterialTextureProperty(embeddedTexIdxs, r, mat.pbrMetallicRoughness.baseColorTexture, aimat, AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_BASE_COLOR_TEXTURE);
SetMaterialTextureProperty(embeddedTexIdxs, r, mat.pbrMetallicRoughness.metallicRoughnessTexture, aimat, AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_METALLICROUGHNESS_TEXTURE);
aimat->AddProperty(&mat.pbrMetallicRoughness.metallicFactor, 1, AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_METALLIC_FACTOR);
aimat->AddProperty(&mat.pbrMetallicRoughness.roughnessFactor, 1, AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_ROUGHNESS_FACTOR);
float roughnessAsShininess = (1 - mat.pbrMetallicRoughness.roughnessFactor) * 1000;
aimat->AddProperty(&roughnessAsShininess, 1, AI_MATKEY_SHININESS);
SetMaterialTextureProperty(embeddedTexIdxs, r, mat.normalTexture, aimat, aiTextureType_NORMALS);
SetMaterialTextureProperty(embeddedTexIdxs, r, mat.occlusionTexture, aimat, aiTextureType_LIGHTMAP);
SetMaterialTextureProperty(embeddedTexIdxs, r, mat.emissiveTexture, aimat, aiTextureType_EMISSIVE);
@ -249,11 +257,16 @@ void glTF2Importer::ImportMaterials(glTF2::Asset& r)
PbrSpecularGlossiness &pbrSG = mat.pbrSpecularGlossiness.value;
aimat->AddProperty(&mat.pbrSpecularGlossiness.isPresent, 1, AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS);
SetMaterialColorProperty(r, pbrSG.diffuseFactor, aimat, AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_DIFFUSE_FACTOR);
SetMaterialColorProperty(r, pbrSG.specularFactor, aimat, AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_SPECULAR_FACTOR);
SetMaterialColorProperty(r, pbrSG.diffuseFactor, aimat, AI_MATKEY_COLOR_DIFFUSE);
SetMaterialColorProperty(r, pbrSG.specularFactor, aimat, AI_MATKEY_COLOR_SPECULAR);
float glossinessAsShininess = pbrSG.glossinessFactor * 1000.0f;
aimat->AddProperty(&glossinessAsShininess, 1, AI_MATKEY_SHININESS);
aimat->AddProperty(&pbrSG.glossinessFactor, 1, AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_GLOSSINESS_FACTOR);
SetMaterialTextureProperty(embeddedTexIdxs, r, pbrSG.diffuseTexture, aimat, AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_DIFFUSE_TEXTURE);
SetMaterialTextureProperty(embeddedTexIdxs, r, pbrSG.specularGlossinessTexture, aimat, AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_SPECULARGLOSSINESS_TEXTURE);
SetMaterialTextureProperty(embeddedTexIdxs, r, pbrSG.diffuseTexture, aimat, aiTextureType_DIFFUSE);
SetMaterialTextureProperty(embeddedTexIdxs, r, pbrSG.specularGlossinessTexture, aimat, aiTextureType_SPECULAR);
}
}
}