Add support for Quaternion in GPU particles graph

#2901

Source/Engine/Core/Types/Variant.cpp

@@ -1824,6 +1824,7 @@ Variant::operator Float4() const
         return Float4(*(Float3*)AsData, 0.0f);
     case VariantType::Float4:
     case VariantType::Color:
+    case VariantType::Quaternion:
         return *(Float4*)AsData;
     case VariantType::Double2:
         return Float4(AsDouble2(), 0.0f, 0.0f);

Source/Engine/Particles/Graph/GPU/ParticleEmitterGraph.GPU.cpp

@@ -456,6 +456,7 @@ void ParticleEmitterGPUGenerator::PrepareGraph(ParticleEmitterGraphGPU* graph)
             mp.AsFloat3 = param->Value.AsFloat3();
             break;
         case VariantType::Float4:
+        case VariantType::Quaternion:
             mp.Type = MaterialParameterType::Vector4;
             *(Float4*)&mp.AsData = param->Value.AsFloat4();
             break;

Source/Engine/Visject/ShaderGraph.cpp

@@ -92,9 +92,13 @@ void ShaderGenerator::ProcessGroupConstants(Box* box, Node* node, Value& value)
             value = Value(cv.W);
         break;
     }
+    // Rotation
     case 8:
     {
-        value = Value::Zero;
+        const float pitch = (float)node->Values[0];
+        const float yaw = (float)node->Values[1];
+        const float roll = (float)node->Values[2];
+        value = Value(Quaternion::Euler(pitch, yaw, roll));
         break;
     }
     // PI

Source/Engine/Visject/ShaderGraphValue.cpp

@@ -460,6 +460,7 @@ ShaderGraphValue ShaderGraphValue::Cast(const ShaderGraphValue& v, VariantType::
     case VariantType::Types::Float4:
     case VariantType::Types::Double4:
     case VariantType::Types::Color:
+    case VariantType::Types::Quaternion:
         switch (v.Type)
         {
         case VariantType::Types::Bool:
@@ -485,16 +486,6 @@ ShaderGraphValue ShaderGraphValue::Cast(const ShaderGraphValue& v, VariantType::
             break;
         }
         break;
-    case VariantType::Types::Quaternion:
-        switch (v.Type)
-        {
-        case VariantType::Types::Color:
-        case VariantType::Types::Float4:
-        case VariantType::Types::Double4:
-            format = TEXT("{}");
-            break;
-        }
-        break;
     }
     if (format == nullptr)
     {

Source/Engine/Visject/VisjectGraph.cpp

@@ -79,6 +79,7 @@ void VisjectExecutor::ProcessGroupConstants(Box* box, Node* node, Value& value)
             value = cv.W;
         break;
     }
+    // Rotation
     case 8:
     {
         const float pitch = (float)node->Values[0];