Fix detection of KHR_materials_specular.

code/AssetLib/glTF2/glTF2Exporter.cpp

@@ -730,7 +730,7 @@ bool glTF2Exporter::GetMatSpecGloss(const aiMaterial &mat, glTF2::PbrSpecularGlo
 
 bool glTF2Exporter::GetMatSpecular(const aiMaterial &mat, glTF2::MaterialSpecular &specular) {
     // Specular requires either/or, default factors of zero disables specular, so do not export
-    if (GetMatColor(mat, specular.specularColorFactor, AI_MATKEY_COLOR_SPECULAR) != AI_SUCCESS || mat.Get(AI_MATKEY_SPECULAR_FACTOR, specular.specularFactor) != AI_SUCCESS) {
+    if (GetMatColor(mat, specular.specularColorFactor, AI_MATKEY_COLOR_SPECULAR) != AI_SUCCESS && mat.Get(AI_MATKEY_SPECULAR_FACTOR, specular.specularFactor) != AI_SUCCESS) {
         return false;
     }
     // The spec states that the default is 1.0 and [1.0, 1.0, 1.0]. We if both are 0, which should disable specular. Otherwise, if one is 0, set to 1.0

test/unit/utglTF2ImportExport.cpp

@@ -60,7 +60,7 @@ using namespace Assimp;
 
 class utglTF2ImportExport : public AbstractImportExportBase {
 public:
-    virtual bool importerMatTest(const char *file, bool spec_gloss, std::array<aiTextureMapMode, 2> exp_modes = { aiTextureMapMode_Wrap, aiTextureMapMode_Wrap }) {
+    virtual bool importerMatTest(const char *file, bool spec, bool gloss, std::array<aiTextureMapMode, 2> exp_modes = { aiTextureMapMode_Wrap, aiTextureMapMode_Wrap }) {
         Assimp::Importer importer;
         const aiScene *scene = importer.ReadFile(file, aiProcess_ValidateDataStructure);
         EXPECT_NE(scene, nullptr);
@@ -105,16 +105,19 @@ public:
 
         aiColor3D spec_color = { 0, 0, 0 };
         ai_real glossiness = ai_real(0.5);
-        if (spec_gloss) {
+        if (spec) {
             EXPECT_EQ(aiReturn_SUCCESS, material->Get(AI_MATKEY_COLOR_SPECULAR, spec_color));
             constexpr ai_real spec_val(0.20000000298023225); // From the file
             EXPECT_EQ(spec_val, spec_color.r);
             EXPECT_EQ(spec_val, spec_color.g);
             EXPECT_EQ(spec_val, spec_color.b);
+        } else {
+            EXPECT_EQ(aiReturn_FAILURE, material->Get(AI_MATKEY_COLOR_SPECULAR, spec_color));
+        }
+        if (gloss) {
             EXPECT_EQ(aiReturn_SUCCESS, material->Get(AI_MATKEY_GLOSSINESS_FACTOR, glossiness));
             EXPECT_EQ(ai_real(1.0), glossiness);
         } else {
-            EXPECT_EQ(aiReturn_FAILURE, material->Get(AI_MATKEY_COLOR_SPECULAR, spec_color));
             EXPECT_EQ(aiReturn_FAILURE, material->Get(AI_MATKEY_GLOSSINESS_FACTOR, glossiness));
         }
 
@@ -143,7 +146,7 @@ public:
 };
 
 TEST_F(utglTF2ImportExport, importglTF2FromFileTest) {
-    EXPECT_TRUE(importerMatTest(ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF/BoxTextured.gltf", false, {aiTextureMapMode_Mirror, aiTextureMapMode_Clamp}));
+    EXPECT_TRUE(importerMatTest(ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF/BoxTextured.gltf", false, false, {aiTextureMapMode_Mirror, aiTextureMapMode_Clamp}));
 }
 
 TEST_F(utglTF2ImportExport, importBinaryglTF2FromFileTest) {
@@ -151,7 +154,7 @@ TEST_F(utglTF2ImportExport, importBinaryglTF2FromFileTest) {
 }
 
 TEST_F(utglTF2ImportExport, importglTF2_KHR_materials_pbrSpecularGlossiness) {
-    EXPECT_TRUE(importerMatTest(ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF-pbrSpecularGlossiness/BoxTextured.gltf", true));
+    EXPECT_TRUE(importerMatTest(ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF-pbrSpecularGlossiness/BoxTextured.gltf", true, true));
 }
 
 void VerifyClearCoatScene(const aiScene *scene) {
@@ -223,13 +226,16 @@ TEST_F(utglTF2ImportExport, importglTF2AndExport_KHR_materials_pbrSpecularGlossi
     // Export with specular glossiness disabled
     EXPECT_EQ(aiReturn_SUCCESS, exporter.Export(scene, "glb2", ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF-pbrSpecularGlossiness/BoxTextured_out.glb"));
     
+    // And re-import
+    EXPECT_TRUE(importerMatTest(ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF-pbrSpecularGlossiness/BoxTextured_out.glb", true, false));
+
     // Export with specular glossiness enabled
     ExportProperties props;
     props.SetPropertyBool(AI_CONFIG_USE_GLTF_PBR_SPECULAR_GLOSSINESS, true);
     EXPECT_EQ(aiReturn_SUCCESS, exporter.Export(scene, "glb2", ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF-pbrSpecularGlossiness/BoxTextured_out.glb", 0, &props));
 
     // And re-import
-    EXPECT_TRUE(importerMatTest(ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF-pbrSpecularGlossiness/BoxTextured_out.glb", true));
+    EXPECT_TRUE(importerMatTest(ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF-pbrSpecularGlossiness/BoxTextured_out.glb", true, true));
 }
 
 TEST_F(utglTF2ImportExport, importglTF2AndExportToOBJ) {