From 4884cf21727607a4abea319e7c71ae69217736d6 Mon Sep 17 00:00:00 2001
From: Matias <matias@dimension10.com>
Date: Wed, 3 Apr 2019 12:35:09 +0200
Subject: [PATCH] issue_2393: Added TransparencyFactor material key

---
 code/FBXConverter.cpp     | 6 ++++++
 include/assimp/material.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/code/FBXConverter.cpp b/code/FBXConverter.cpp
index a61ae4006..71989b9f5 100644
--- a/code/FBXConverter.cpp
+++ b/code/FBXConverter.cpp
@@ -2041,6 +2041,12 @@ namespace Assimp {
                 CalculatedOpacity = 1.0f - ((Transparent.r + Transparent.g + Transparent.b) / 3.0f);
             }
 
+            // try to get the transparency factor
+            const float TransparencyFactor = PropertyGet<float>(props, "TransparencyFactor", ok);
+            if (ok) {
+                out_mat->AddProperty(&TransparencyFactor, 1, AI_MATKEY_TRANSPARENCYFACTOR);
+            }
+
             // use of TransparencyFactor is inconsistent.
             // Maya always stores it as 1.0,
             // so we can't use it to set AI_MATKEY_OPACITY.
diff --git a/include/assimp/material.h b/include/assimp/material.h
index b882bbc72..4b5a1293d 100644
--- a/include/assimp/material.h
+++ b/include/assimp/material.h
@@ -900,6 +900,7 @@ extern "C" {
 #define AI_MATKEY_ENABLE_WIREFRAME "$mat.wireframe",0,0
 #define AI_MATKEY_BLEND_FUNC "$mat.blend",0,0
 #define AI_MATKEY_OPACITY "$mat.opacity",0,0
+#define AI_MATKEY_TRANSPARENCYFACTOR "$mat.transparencyfactor",0,0
 #define AI_MATKEY_BUMPSCALING "$mat.bumpscaling",0,0
 #define AI_MATKEY_SHININESS "$mat.shininess",0,0
 #define AI_MATKEY_REFLECTIVITY "$mat.reflectivity",0,0