Initiual commit: AssetImporter source moved from ZFXCE repository to its own repository. PLease do not use the ZFXCE repo any more.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@1 67173fc5-114c-0410-ac8e-9d2fd5bffc1f
2008-05-05 12:36:31 +00:00
commit b76f999cb7
131 changed files with 24989 additions and 0 deletions
--- a/code/GenVertexNormalsProcess.cpp
+++ b/code/GenVertexNormalsProcess.cpp
@@ -0,0 +1,104 @@
+/** @file Implementation of the post processing step to generate face
+* normals for all imported faces.
+*/
+#include "GenVertexNormalsProcess.h"
+#include "SpatialSort.h"
+#include "../include/aiPostProcess.h"
+#include "../include/aiMesh.h"
+#include "../include/aiScene.h"
+
+using namespace Assimp;
+
+// Constructor to be privately used by Importer
+GenVertexNormalsProcess::GenVertexNormalsProcess()
+{
+}
+
+// Destructor, private as well
+GenVertexNormalsProcess::~GenVertexNormalsProcess()
+{
+	// nothing to do here
+}
+
+// -------------------------------------------------------------------
+// Returns whether the processing step is present in the given flag field.
+bool GenVertexNormalsProcess::IsActive( unsigned int pFlags) const
+{
+	return (pFlags & aiProcess_GenSmoothNormals) != 0;
+}
+
+// -------------------------------------------------------------------
+// Executes the post processing step on the given imported data.
+void GenVertexNormalsProcess::Execute( aiScene* pScene)
+{
+	for( unsigned int a = 0; a < pScene->mNumMeshes; a++)
+		this->GenMeshVertexNormals( pScene->mMeshes[a]);
+}
+
+// -------------------------------------------------------------------
+// Executes the post processing step on the given imported data.
+void GenVertexNormalsProcess::GenMeshVertexNormals (aiMesh* pMesh)
+{
+	if (NULL != pMesh->mNormals)return;
+
+	pMesh->mNormals = new aiVector3D[pMesh->mNumVertices];
+	for( unsigned int a = 0; a < pMesh->mNumFaces; a++)
+	{
+		const aiFace& face = pMesh->mFaces[a];
+
+		// assume it is a triangle
+		aiVector3D* pV1 = &pMesh->mVertices[face.mIndices[0]];
+		aiVector3D* pV2 = &pMesh->mVertices[face.mIndices[1]];
+		aiVector3D* pV3 = &pMesh->mVertices[face.mIndices[2]];
+
+		aiVector3D pDelta1 = *pV2 - *pV1;
+		aiVector3D pDelta2 = *pV3 - *pV1;
+		aiVector3D vNor = pDelta1 ^ pDelta2;
+		float fLength = vNor.Length();
+		if (0.0f != fLength)vNor /= fLength;
+
+		pMesh->mNormals[face.mIndices[0]] = vNor;
+		pMesh->mNormals[face.mIndices[1]] = vNor;
+		pMesh->mNormals[face.mIndices[2]] = vNor;
+	}
+
+	// calculate the position bounds so we have a reliable epsilon to 
+	// check position differences against 
+	aiVector3D minVec( 1e10f, 1e10f, 1e10f), maxVec( -1e10f, -1e10f, -1e10f);
+	for( unsigned int a = 0; a < pMesh->mNumVertices; a++)
+	{
+		minVec.x = std::min( minVec.x, pMesh->mVertices[a].x);
+		minVec.y = std::min( minVec.y, pMesh->mVertices[a].y);
+		minVec.z = std::min( minVec.z, pMesh->mVertices[a].z);
+		maxVec.x = std::max( maxVec.x, pMesh->mVertices[a].x);
+		maxVec.y = std::max( maxVec.y, pMesh->mVertices[a].y);
+		maxVec.z = std::max( maxVec.z, pMesh->mVertices[a].z);
+	}
+
+	const float posEpsilon = (maxVec - minVec).Length() * 1e-5f;
+	// set up a SpatialSort to quickly find all vertices close to a given position
+	SpatialSort vertexFinder( pMesh->mVertices, pMesh->mNumVertices, sizeof( aiVector3D));
+	std::vector<unsigned int> verticesFound;
+
+	aiVector3D* pcNew = new aiVector3D[pMesh->mNumVertices];
+	for (unsigned int i = 0; i < pMesh->mNumVertices;++i)
+	{
+		const aiVector3D& posThis = pMesh->mVertices[i];
+
+		// get all vertices that share this one ...
+		vertexFinder.FindPositions( posThis, posEpsilon, verticesFound);
+
+		aiVector3D pcNor; 
+		for (unsigned int a = 0; a < verticesFound.size(); ++a)
+		{
+			unsigned int vidx = verticesFound[a];
+			pcNor += pMesh->mNormals[vidx];
+		}
+		pcNor /= (float) verticesFound.size();
+		pcNew[i] = pcNor;
+	}
+	delete pMesh->mNormals;
+	pMesh->mNormals = pcNew;
+
+	return;
+}