add the ability to export cameras information in a collada file

code/ColladaExporter.cpp

@@ -127,6 +127,7 @@ void ColladaExporter::WriteFile()
 	WriteTextures();
 	WriteHeader();
 
+	WriteCamerasLibrary();
 	WriteMaterials();
 	WriteGeometryLibrary();
 
@@ -286,6 +287,61 @@ void ColladaExporter::WriteTextures() {
 	}
 }
 
+// ------------------------------------------------------------------------------------------------
+// Write the embedded textures
+void ColladaExporter::WriteCamerasLibrary() {
+	if(mScene->HasCameras()) {
+
+		mOutput << startstr << "<library_cameras>" << endstr;
+		PushTag();
+
+		for( size_t a = 0; a < mScene->mNumCameras; ++a)
+			WriteCamera( a);
+
+		PopTag();
+		mOutput << startstr << "</library_cameras>" << endstr;
+
+	}
+}
+
+void ColladaExporter::WriteCamera(size_t pIndex){
+
+	const aiCamera *cam = mScene->mCameras[pIndex];
+	const std::string idstrEscaped = XMLEscape(cam->mName.C_Str());
+
+	mOutput << startstr << "<camera id=\"" << idstrEscaped << "-camera\" name=\"" << idstrEscaped << "_name\" >" << endstr;
+	PushTag();
+	mOutput << startstr << "<optics>" << endstr;
+	PushTag();
+	mOutput << startstr << "<technique_common>" << endstr;
+	PushTag();
+	//assimp doesn't support the import of orthographic cameras! se we write
+	//always perspective
+	mOutput << startstr << "<perspective>" << endstr;
+	PushTag();
+	mOutput << startstr << "<xfov sid=\"xfov\">"<<
+								AI_RAD_TO_DEG(cam->mHorizontalFOV)
+						<<"</xfov>" << endstr;
+	mOutput << startstr << "<aspect_ratio>"
+						<<		cam->mAspect
+						<< "</aspect_ratio>" << endstr;
+	mOutput << startstr << "<znear sid=\"znear\">"
+						<<		cam->mClipPlaneNear
+						<<	"</znear>" << endstr;
+	mOutput << startstr << "<zfar sid=\"zfar\">"
+						<<		cam->mClipPlaneFar
+						<< "</zfar>" << endstr;
+	PopTag();
+	mOutput << startstr << "</perspective>" << endstr;
+	PopTag();
+	mOutput << startstr << "</technique_common>" << endstr;
+	PopTag();
+	mOutput << startstr << "</optics>" << endstr;
+	PopTag();
+	mOutput << startstr << "</camera>" << endstr;
+
+}
+
 // ------------------------------------------------------------------------------------------------
 // Reads a single surface entry from the given material keys
 void ColladaExporter::ReadMaterialSurface( Surface& poSurface, const aiMaterial* pSrcMat, aiTextureType pTexture, const char* pKey, size_t pType, size_t pIndex)
@@ -847,6 +903,9 @@ void ColladaExporter::WriteNode(aiNode* pNode)
 	mOutput << mat.d1 << " " << mat.d2 << " " << mat.d3 << " " << mat.d4;
 	mOutput << "</matrix>" << endstr;
 
+	if(pNode->mNumMeshes==0){
+		mOutput << startstr <<"<instance_camera url=\"#" << node_name_escaped << "-camera\">" << endstr;
+	}else
 	// instance every geometry
 	for( size_t a = 0; a < pNode->mNumMeshes; ++a )
 	{
@@ -854,9 +913,8 @@ void ColladaExporter::WriteNode(aiNode* pNode)
 	// do not instanciate mesh if empty. I wonder how this could happen
 	if( mesh->mNumFaces == 0 || mesh->mNumVertices == 0 )
 		continue;
-
-		mOutput << startstr << "<instance_geometry url=\"#" << XMLEscape(GetMeshId( pNode->mMeshes[a])) << "\">" << endstr;
-		PushTag();
+	mOutput << startstr << "<instance_geometry url=\"#" << XMLEscape(GetMeshId( pNode->mMeshes[a])) << "\">" << endstr;
+	PushTag();
 	mOutput << startstr << "<bind_material>" << endstr;
 	PushTag();
 	mOutput << startstr << "<technique_common>" << endstr;

code/ColladaExporter.h

@@ -83,6 +83,11 @@ protected:
 	/// Writes the material setup
 	void WriteMaterials();
 
+	/// Writes the cameras library
+	void WriteCamerasLibrary();
+
+	void WriteCamera(size_t pIndex);
+
 	/// Writes the geometry library
 	void WriteGeometryLibrary();
 

test/CMakeLists.txt

@@ -40,6 +40,7 @@ SET( TEST_SRCS
     unit/utTriangulate.cpp
     unit/utVertexTriangleAdjacency.cpp
     unit/utNoBoostTest.cpp
+    unit/utColladaExportCamera.cpp
 )
 
 SOURCE_GROUP( tests FILES  ${TEST_SRCS} )

test/models/Collada/cameras.dae

@@ -0,0 +1,93 @@
+<?xml version="1.0" encoding="utf-8"?>
+<COLLADA xmlns="http://www.collada.org/2005/11/COLLADASchema" version="1.4.1">
+  <asset>
+    <contributor>
+      <author>Blender User</author>
+      <authoring_tool>Blender 2.74.0 commit date:2015-03-31, commit time:13:39, hash:000dfc0</authoring_tool>
+    </contributor>
+    <created>2015-05-17T19:24:51</created>
+    <modified>2015-05-17T19:24:51</modified>
+    <unit name="meter" meter="1"/>
+    <up_axis>Z_UP</up_axis>
+  </asset>
+  <library_cameras>
+    <camera id="Camera-camera" name="Camera.001">
+      <optics>
+        <technique_common>
+          <perspective>
+            <xfov sid="xfov">49.13434</xfov>
+            <aspect_ratio>1.777778</aspect_ratio>
+            <znear sid="znear">0.1</znear>
+            <zfar sid="zfar">100</zfar>
+          </perspective>
+        </technique_common>
+      </optics>
+      <extra>
+        <technique profile="blender">
+          <YF_dofdist>0</YF_dofdist>
+          <shiftx>0</shiftx>
+          <shifty>0</shifty>
+        </technique>
+      </extra>
+    </camera>
+    <camera id="Camera_002-camera" name="Camera.002">
+      <optics>
+        <technique_common>
+          <orthographic>
+            <xmag sid="xmag">3</xmag>
+            <aspect_ratio>1.777778</aspect_ratio>
+            <znear sid="znear">0.1</znear>
+            <zfar sid="zfar">100</zfar>
+          </orthographic>
+        </technique_common>
+      </optics>
+      <extra>
+        <technique profile="blender">
+          <YF_dofdist>0</YF_dofdist>
+          <shiftx>0</shiftx>
+          <shifty>0</shifty>
+        </technique>
+      </extra>
+    </camera>
+    <camera id="Camera_003-camera" name="Camera.003">
+      <optics>
+        <technique_common>
+          <perspective>
+            <xfov sid="xfov">29.86284</xfov>
+            <aspect_ratio>1.777778</aspect_ratio>
+            <znear sid="znear">0.1</znear>
+            <zfar sid="zfar">50</zfar>
+          </perspective>
+        </technique_common>
+      </optics>
+      <extra>
+        <technique profile="blender">
+          <YF_dofdist>0</YF_dofdist>
+          <shiftx>0</shiftx>
+          <shifty>0</shifty>
+        </technique>
+      </extra>
+    </camera>
+  </library_cameras>
+  <library_images/>
+  <library_controllers/>
+  <library_visual_scenes>
+    <visual_scene id="Scene" name="Scene">
+      <node id="Camera" name="Camera" type="NODE">
+        <matrix sid="transform">7.54979e-8 0 1 10 0 1 0 0 -1 0 7.54979e-8 0 0 0 0 1</matrix>
+        <instance_camera url="#Camera-camera"/>
+      </node>
+      <node id="Camera_002" name="Camera_002" type="NODE">
+        <matrix sid="transform">7.54979e-8 0 -1 -10 0 1 0 0 1 0 7.54979e-8 0 0 0 0 1</matrix>
+        <instance_camera url="#Camera_002-camera"/>
+      </node>
+      <node id="Camera_003" name="Camera_003" type="NODE">
+        <matrix sid="transform">3.09086e-8 -1 1.58933e-8 0 -3.09086e-8 1.58933e-8 1 5 -1 -3.09086e-8 -3.09086e-8 0 0 0 0 1</matrix>
+        <instance_camera url="#Camera_003-camera"/>
+      </node>
+    </visual_scene>
+  </library_visual_scenes>
+  <scene>
+    <instance_visual_scene url="#Scene"/>
+  </scene>
+</COLLADA>