diff --git a/code/AssetLib/glTF2/glTF2Asset.h b/code/AssetLib/glTF2/glTF2Asset.h index fb3100b2c..c790a1374 100644 --- a/code/AssetLib/glTF2/glTF2Asset.h +++ b/code/AssetLib/glTF2/glTF2Asset.h @@ -50,6 +50,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * KHR_materials_clearcoat full * KHR_materials_transmission full * KHR_materials_volume full + * KHR_materials_ior full */ #ifndef GLTF2ASSET_H_INC #define GLTF2ASSET_H_INC @@ -789,6 +790,13 @@ struct MaterialVolume { void SetDefaults(); }; +struct MaterialIOR { + float ior = 0.f; + + MaterialIOR() { SetDefaults(); } + void SetDefaults(); +}; + //! The material appearance of a primitive. struct Material : public Object { //PBR metallic roughness properties @@ -817,6 +825,9 @@ struct Material : public Object { //extension: KHR_materials_volume Nullable materialVolume; + + //extension: KHR_materials_ior + Nullable materialIOR; //extension: KHR_materials_unlit bool unlit; @@ -1107,6 +1118,7 @@ public: bool KHR_materials_clearcoat; bool KHR_materials_transmission; bool KHR_materials_volume; + bool KHR_materials_ior; bool KHR_draco_mesh_compression; bool FB_ngon_encoding; bool KHR_texture_basisu; diff --git a/code/AssetLib/glTF2/glTF2Asset.inl b/code/AssetLib/glTF2/glTF2Asset.inl index ff71ff53b..d65b4132b 100644 --- a/code/AssetLib/glTF2/glTF2Asset.inl +++ b/code/AssetLib/glTF2/glTF2Asset.inl @@ -1228,6 +1228,16 @@ inline void Material::Read(Value &material, Asset &r) { } } + if (r.extensionsUsed.KHR_materials_ior) { + if (Value *curMaterialIOR = FindObject(*extensions, "KHR_materials_ior")) { + MaterialIOR ior; + + ReadMember(*curMaterialIOR, "ior", ior.ior); + + this->materialIOR = Nullable(ior); + } + } + unlit = nullptr != FindObject(*extensions, "KHR_materials_unlit"); } } @@ -1280,6 +1290,11 @@ inline void MaterialVolume::SetDefaults() { SetVector(attenuationColor, defaultAttenuationColor); } +inline void MaterialIOR::SetDefaults() { + //KHR_materials_ior properties + ior = 1.5f; +} + namespace { template @@ -1952,6 +1967,7 @@ inline void Asset::ReadExtensionsUsed(Document &doc) { CHECK_EXT(KHR_materials_clearcoat); CHECK_EXT(KHR_materials_transmission); CHECK_EXT(KHR_materials_volume); + CHECK_EXT(KHR_materials_ior); CHECK_EXT(KHR_draco_mesh_compression); CHECK_EXT(KHR_texture_basisu); diff --git a/code/AssetLib/glTF2/glTF2AssetWriter.h b/code/AssetLib/glTF2/glTF2AssetWriter.h index 9be3fdf0c..ce8b4d65e 100644 --- a/code/AssetLib/glTF2/glTF2AssetWriter.h +++ b/code/AssetLib/glTF2/glTF2AssetWriter.h @@ -50,6 +50,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * KHR_materials_clearcoat: full * KHR_materials_transmission: full * KHR_materials_volume: full + * KHR_materials_ior: full */ #ifndef GLTF2ASSETWRITER_H_INC #define GLTF2ASSETWRITER_H_INC diff --git a/code/AssetLib/glTF2/glTF2AssetWriter.inl b/code/AssetLib/glTF2/glTF2AssetWriter.inl index 03b8476dc..b91553fbe 100644 --- a/code/AssetLib/glTF2/glTF2AssetWriter.inl +++ b/code/AssetLib/glTF2/glTF2AssetWriter.inl @@ -496,6 +496,20 @@ namespace glTF2 { } } + if (m.materialIOR.isPresent) { + Value materialIOR(rapidjson::Type::kObjectType); + + MaterialIOR &ior = m.materialIOR.value; + + if (ior.ior != 1.5f) { + WriteFloat(materialIOR, ior.ior, "ior", w.mAl); + } + + if (!materialIOR.ObjectEmpty()) { + exts.AddMember("KHR_materials_ior", materialIOR, w.mAl); + } + } + if (!exts.ObjectEmpty()) { obj.AddMember("extensions", exts, w.mAl); } @@ -916,6 +930,10 @@ namespace glTF2 { exts.PushBack(StringRef("KHR_materials_volume"), mAl); } + if (this->mAsset.extensionsUsed.KHR_materials_ior) { + exts.PushBack(StringRef("KHR_materials_ior"), mAl); + } + if (this->mAsset.extensionsUsed.FB_ngon_encoding) { exts.PushBack(StringRef("FB_ngon_encoding"), mAl); } diff --git a/code/AssetLib/glTF2/glTF2Exporter.cpp b/code/AssetLib/glTF2/glTF2Exporter.cpp index 22db4b26d..8327f8c54 100644 --- a/code/AssetLib/glTF2/glTF2Exporter.cpp +++ b/code/AssetLib/glTF2/glTF2Exporter.cpp @@ -704,6 +704,22 @@ bool glTF2Exporter::GetMatTransmission(const aiMaterial &mat, glTF2::MaterialTra return result || transmission.transmissionTexture.texture; } +bool glTF2Exporter::GetMatVolume(const aiMaterial &mat, glTF2::MaterialVolume &volume) { + bool result = mat.Get(AI_MATKEY_VOLUME_THICKNESS_FACTOR, volume.thicknessFactor) != aiReturn_SUCCESS; + + GetMatTex(mat, volume.thicknessTexture, AI_MATKEY_VOLUME_THICKNESS_TEXTURE); + + result = result || mat.Get(AI_MATKEY_VOLUME_ATTENUATION_DISTANCE, volume.attenuationDistance); + result = result || GetMatColor(mat, volume.attenuationColor, AI_MATKEY_VOLUME_ATTENUATION_COLOR) != aiReturn_SUCCESS; + + // Valid if any of these properties are available + return result || volume.thicknessTexture.texture; +} + +bool glTF2Exporter::GetMatIOR(const aiMaterial &mat, glTF2::MaterialIOR &ior) { + return mat.Get(AI_MATKEY_IOR, ior.ior) == aiReturn_SUCCESS; +} + void glTF2Exporter::ExportMaterials() { aiString aiName; for (unsigned int i = 0; i < mScene->mNumMaterials; ++i) { @@ -824,6 +840,18 @@ void glTF2Exporter::ExportMaterials() { mAsset->extensionsUsed.KHR_materials_transmission = true; m->materialTransmission = Nullable(transmission); } + + MaterialVolume volume; + if (GetMatVolume(mat, volume)) { + mAsset->extensionsUsed.KHR_materials_volume = true; + m->materialVolume = Nullable(volume); + } + + MaterialIOR ior; + if (GetMatIOR(mat, ior)) { + mAsset->extensionsUsed.KHR_materials_ior = true; + m->materialIOR = Nullable(ior); + } } } } diff --git a/code/AssetLib/glTF2/glTF2Exporter.h b/code/AssetLib/glTF2/glTF2Exporter.h index 842d29815..6d70d915e 100644 --- a/code/AssetLib/glTF2/glTF2Exporter.h +++ b/code/AssetLib/glTF2/glTF2Exporter.h @@ -77,6 +77,8 @@ struct PbrSpecularGlossiness; struct MaterialSheen; struct MaterialClearcoat; struct MaterialTransmission; +struct MaterialVolume; +struct MaterialIOR; // Vec/matrix types, as raw float arrays typedef float(vec2)[2]; @@ -114,6 +116,8 @@ protected: bool GetMatSheen(const aiMaterial &mat, glTF2::MaterialSheen &sheen); bool GetMatClearcoat(const aiMaterial &mat, glTF2::MaterialClearcoat &clearcoat); bool GetMatTransmission(const aiMaterial &mat, glTF2::MaterialTransmission &transmission); + bool GetMatVolume(const aiMaterial &mat, glTF2::MaterialVolume &volume); + bool GetMatIOR(const aiMaterial &mat, glTF2::MaterialIOR &ior); void ExportMetadata(); void ExportMaterials(); void ExportMeshes(); diff --git a/code/AssetLib/glTF2/glTF2Importer.cpp b/code/AssetLib/glTF2/glTF2Importer.cpp index 136b01d07..c7de2af4f 100644 --- a/code/AssetLib/glTF2/glTF2Importer.cpp +++ b/code/AssetLib/glTF2/glTF2Importer.cpp @@ -351,6 +351,13 @@ static aiMaterial *ImportMaterial(std::vector &embeddedTexIdxs, Asset &r, M SetMaterialColorProperty(r, volume.attenuationColor, aimat, AI_MATKEY_VOLUME_ATTENUATION_COLOR); } + // KHR_materials_ior + if (mat.materialIOR.isPresent) { + MaterialIOR &ior = mat.materialIOR.value; + + aimat->AddProperty(&ior.ior, 1, AI_MATKEY_IOR); + } + return aimat; } catch (...) { delete aimat; diff --git a/include/assimp/material.h b/include/assimp/material.h index 2373185fc..c86848993 100644 --- a/include/assimp/material.h +++ b/include/assimp/material.h @@ -1037,14 +1037,22 @@ extern "C" { // Volume // ------------ // https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_volume -// Base percentage of light transmitted through the surface. 0.0 = Opaque, 1.0 = Fully transparent +// The thickness of the volume beneath the surface. If the value is 0 the material is thin-walled. Otherwise the material is a volume boundary. #define AI_MATKEY_VOLUME_THICKNESS_FACTOR "$mat.volume.thicknessFactor", 0, 0 -// Texture defining percentage of light transmitted through the surface. +// Texture that defines the thickness. // Multiplied by AI_MATKEY_THICKNESS_FACTOR #define AI_MATKEY_VOLUME_THICKNESS_TEXTURE aiTextureType_VOLUME, 0 +// Density of the medium given as the average distance that light travels in the medium before interacting with a particle. #define AI_MATKEY_VOLUME_ATTENUATION_DISTANCE "$mat.volume.attenuationDistance", 0, 0 +// The color that white light turns into due to absorption when reaching the attenuation distance. #define AI_MATKEY_VOLUME_ATTENUATION_COLOR "$mat.volume.attenuationColor", 0, 0 +// IOR +// ------------ +// https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_ior +// Index of Refraction. +#define AI_MATKEY_IOR "$mat.ior", 0, 0 + // Emissive // -------- #define AI_MATKEY_USE_EMISSIVE_MAP "$mat.useEmissiveMap", 0, 0