Gracefully handle NaNs and Infs in gltf2 accessor bound computation

code/AssetLib/glTF2/glTF2Exporter.cpp

@@ -1,4 +1,4 @@
-/*
+/*
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------
 
@@ -172,6 +172,13 @@ void SetAccessorRange(Ref<Accessor> acc, void* data, size_t count,
 		for (unsigned int j = 0 ; j < numCompsOut ; j++) {
 			double valueTmp = buffer_ptr[j];
 
+			// Gracefully tolerate rogue NaN's in buffer data
+			// Any NaNs/Infs introduced in accessor bounds will end up in
+			// document and prevent rapidjson from writing out valid JSON
+			if (!std::isfinite(valueTmp)) {
+				continue;
+			}
+
 			if (valueTmp < acc->min[j]) {
 				acc->min[j] = valueTmp;
 			}
@@ -348,7 +355,7 @@ void glTF2Exporter::GetMatTex(const aiMaterial* mat, Ref<Texture>& texture, aiTe
 
                     if (path[0] == '*') { // embedded
                         aiTexture* curTex = mScene->mTextures[atoi(&path[1])];
-						
+
                         texture->source->name = curTex->mFilename.C_Str();
 
                         // The asset has its own buffer, see Image::SetData
@@ -762,7 +769,7 @@ void glTF2Exporter::ExportMeshes()
         for (int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
 			if (!aim->HasTextureCoords(i))
 				continue;
-			
+
             // Flip UV y coords
             if (aim -> mNumUVComponents[i] > 1) {
                 for (unsigned int j = 0; j < aim->mNumVertices; ++j) {

test/unit/utglTF2ImportExport.cpp

@@ -442,8 +442,8 @@ TEST_F(utglTF2ImportExport, export_bad_accessor_bounds) {
     const aiScene* scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/BoxWithInfinites-glTF-Binary/BoxWithInfinites.glb", aiProcess_ValidateDataStructure);
     ASSERT_NE(scene, nullptr);
 
-    EXPECT_EQ(aiReturn_FAILURE, exporter.Export(scene, "glb2", ASSIMP_TEST_MODELS_DIR "/glTF2/BoxWithInfinites-glTF-Binary/BoxWithInfinites_out.glb"));
-    EXPECT_EQ(aiReturn_FAILURE, exporter.Export(scene, "gltf2", ASSIMP_TEST_MODELS_DIR "/glTF2/BoxWithInfinites-glTF-Binary/BoxWithInfinites_out.gltf"));
+    EXPECT_EQ(aiReturn_SUCCESS, exporter.Export(scene, "glb2", ASSIMP_TEST_MODELS_DIR "/glTF2/BoxWithInfinites-glTF-Binary/BoxWithInfinites_out.glb"));
+    EXPECT_EQ(aiReturn_SUCCESS, exporter.Export(scene, "gltf2", ASSIMP_TEST_MODELS_DIR "/glTF2/BoxWithInfinites-glTF-Binary/BoxWithInfinites_out.gltf"));
 }
 
 #endif // ASSIMP_BUILD_NO_EXPORT