From 4654afb34c040e54d44308ad338ed5ba14aec176 Mon Sep 17 00:00:00 2001
From: Arystanbek Dyussenov <arystan.d@gmail.com>
Date: Fri, 11 Dec 2009 13:54:56 +0000
Subject: COLLADA branch: patch from Jan Diederich for bump-map export via
 <extra> tag.

---
 source/blender/collada/DocumentExporter.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'source/blender/collada/DocumentExporter.cpp')

diff --git a/source/blender/collada/DocumentExporter.cpp b/source/blender/collada/DocumentExporter.cpp
index 6a11fd51e4a..e2a3cca4f33 100644
--- a/source/blender/collada/DocumentExporter.cpp
+++ b/source/blender/collada/DocumentExporter.cpp
@@ -1538,9 +1538,23 @@ public:
 			if (t->mapto & MAP_REF) {
 				ep.setReflective(createTexture(ima, uvname, sampler));
 			}
+			// alpha
 			if (t->mapto & MAP_ALPHA) {
 				ep.setTransparent(createTexture(ima, uvname, sampler));
 			}
+			// extension:
+			// Normal map --> Must be stored with <extra> tag as different technique, 
+			// since COLLADA doesn't support normal maps, even in current COLLADA 1.5.
+			if (t->mapto & MAP_NORM) {
+				COLLADASW::Texture texture(key);
+				texture.setTexcoord(uvname);
+				texture.setSampler(*sampler);
+				// technique FCOLLADA, with the <bump> tag, is most likely the best understood,
+				// most widespread de-facto standard.
+				texture.setProfileName("FCOLLADA");
+				texture.setChildElementName("bump");				
+				ep.setExtraTechniqueColorOrTexture(COLLADASW::ColorOrTexture(texture));
+			}
 		}
 		// performs the actual writing
 		ep.addProfileElements();
-- 
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