From 5ea06e1bb69e4b61c3f05160c9c38ed1187a5102 Mon Sep 17 00:00:00 2001
From: JeffH-BMG <37119778+JeffH-BMG@users.noreply.github.com>
Date: Tue, 6 Mar 2018 14:50:02 -0500
Subject: [PATCH] Add support for texture file in PLY exports

The PLY format has an unofficial way to specify an associated texture, using the "comment TextureFile"  comment line. The PLY loader supports this, but the exporter does not. The change looks for a diffuse texture in the scene's materials, and if it finds one, it adds it to the exported mesh using "comment TextureFile".
---
 code/PlyExporter.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/code/PlyExporter.cpp b/code/PlyExporter.cpp
index 0ddba0d2a..2d528c96c 100644
--- a/code/PlyExporter.cpp
+++ b/code/PlyExporter.cpp
@@ -148,6 +148,17 @@ PlyExporter::PlyExporter(const char* _filename, const aiScene* pScene, bool bina
         << aiGetVersionMajor() << '.' << aiGetVersionMinor() << '.'
         << aiGetVersionRevision() << ")" << endl;
 
+    // Look through materials for a diffuse texture, and add it if found
+    for ( unsigned int i = 0; i < pScene->mNumMaterials; ++i )
+    {
+        const aiMaterial* const mat = pScene->mMaterials[i];
+        aiString s;
+        if ( AI_SUCCESS == mat->Get( AI_MATKEY_TEXTURE_DIFFUSE( 0 ), s ) )
+        {
+            mOutput << "comment TextureFile " << s.data << endl;
+        }
+    }
+
     // TODO: probably want to check here rather than just assume something
     //       definitely not good to always write float even if we might have double precision