Fix alphaMode of glb exporting

Only export alphaMode as BLEND when there are transparent parts.

src/document.cpp

@@ -37,6 +37,7 @@ Document::Document() :
     textureMetalnessImage(nullptr),
     textureRoughnessImage(nullptr),
     textureAmbientOcclusionImage(nullptr),
+    textureHasTransparencySettings(false),
     rigType(RigType::None),
     weldEnabled(true),
     polyCount(PolyCount::Original),
@@ -2087,6 +2088,8 @@ void Document::textureReady()
     delete m_resultTextureMesh;
     m_resultTextureMesh = m_textureGenerator->takeResultMesh();
     
+    textureHasTransparencySettings = m_textureGenerator->hasTransparencySettings();
+    
     //addToolToMesh(m_resultTextureMesh);
     
     m_textureImageUpdateVersion++;

src/document.h

@@ -534,6 +534,7 @@ public: // need initialize
     QImage *textureMetalnessImage;
     QImage *textureRoughnessImage;
     QImage *textureAmbientOcclusionImage;
+    bool textureHasTransparencySettings;
     RigType rigType;
     bool weldEnabled;
     PolyCount polyCount;

src/documentwindow.cpp

@@ -1703,6 +1703,7 @@ void DocumentWindow::exportGlbToFilename(const QString &filename)
         exportMotions.push_back({motion->name, motion->jointNodeTrees});
     }
     GlbFileWriter glbFileWriter(skeletonResult, m_document->resultRigBones(), m_document->resultRigWeights(), filename,
+        m_document->textureHasTransparencySettings,
         m_document->textureImage, m_document->textureNormalImage, m_document->textureMetalnessRoughnessAmbientOcclusionImage, exportMotions.empty() ? nullptr : &exportMotions);
     glbFileWriter.save();
     QApplication::restoreOverrideCursor();

src/glbfile.cpp

@@ -26,6 +26,7 @@ GlbFileWriter::GlbFileWriter(Outcome &outcome,
         const std::vector<RiggerBone> *resultRigBones,
         const std::map<int, RiggerVertexWeights> *resultRigWeights,
         const QString &filename,
+        bool textureHasTransparencySettings,
         QImage *textureImage,
         QImage *normalImage,
         QImage *ormImage,
@@ -169,6 +170,7 @@ GlbFileWriter::GlbFileWriter(Outcome &outcome,
         m_json["materials"][primitiveIndex]["pbrMetallicRoughness"]["baseColorTexture"]["index"] = textureIndex++;
         m_json["materials"][primitiveIndex]["pbrMetallicRoughness"]["metallicFactor"] = MeshLoader::m_defaultMetalness;
         m_json["materials"][primitiveIndex]["pbrMetallicRoughness"]["roughnessFactor"] = MeshLoader::m_defaultRoughness;
+        if (textureHasTransparencySettings)
             m_json["materials"][primitiveIndex]["alphaMode"] = "BLEND";
         if (normalImage) {
             m_json["materials"][primitiveIndex]["normalTexture"]["index"] = textureIndex++;

src/glbfile.h

@@ -19,6 +19,7 @@ public:
         const std::vector<RiggerBone> *resultRigBones,
         const std::map<int, RiggerVertexWeights> *resultRigWeights,
         const QString &filename,
+        bool textureHasTransparencySettings,
         QImage *textureImage=nullptr,
         QImage *normalImage=nullptr,
         QImage *ormImage=nullptr,

src/texturegenerator.cpp

@@ -24,7 +24,8 @@ TextureGenerator::TextureGenerator(const Outcome &outcome, Snapshot *snapshot) :
     m_resultTextureMetalnessImage(nullptr),
     m_resultTextureAmbientOcclusionImage(nullptr),
     m_resultMesh(nullptr),
-    m_snapshot(snapshot)
+    m_snapshot(snapshot),
+    m_hasTransparencySettings(false)
 {
     m_outcome = new Outcome();
     *m_outcome = outcome;
@@ -210,6 +211,11 @@ void TextureGenerator::prepare()
     }
 }
 
+bool TextureGenerator::hasTransparencySettings()
+{
+    return m_hasTransparencySettings;
+}
+
 void TextureGenerator::generate()
 {
     m_resultMesh = new MeshLoader(*m_outcome);
@@ -240,6 +246,10 @@ void TextureGenerator::generate()
     std::map<std::pair<QUuid, QUuid>, const OutcomeNode *> nodeMap;
     std::map<QUuid, float> partColorSolubilityMap;
     for (const auto &item: m_outcome->nodes) {
+        if (!m_hasTransparencySettings) {
+            if (!qFuzzyCompare(1.0, item.color.alphaF()))
+                m_hasTransparencySettings = true;
+        }
         nodeMap.insert({{item.partId, item.nodeId}, &item});
         partColorMap.insert({item.partId, item.color});
         partColorSolubilityMap.insert({item.partId, item.colorSolubility});

src/texturegenerator.h

@@ -26,6 +26,7 @@ public:
     QImage *takeResultTextureAmbientOcclusionImage();
     Outcome *takeOutcome();
     MeshLoader *takeResultMesh();
+    bool hasTransparencySettings();
     void addPartColorMap(QUuid partId, const QImage *image, float tileScale);
     void addPartNormalMap(QUuid partId, const QImage *image, float tileScale);
     void addPartMetalnessMap(QUuid partId, const QImage *image, float tileScale);
@@ -60,6 +61,7 @@ private:
     std::map<QUuid, std::pair<QImage, float>> m_partAmbientOcclusionTextureMap;
     std::set<QUuid> m_countershadedPartIds;
     Snapshot *m_snapshot;
+    bool m_hasTransparencySettings;
 };
 
 #endif