134 lines
3.9 KiB
C++
134 lines
3.9 KiB
C++
/** @file Implementation of the 3ds importer class */
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#include "3DSLoader.h"
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#include "MaterialSystem.h"
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#include <algorithm>
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#include "../include/IOStream.h"
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#include "../include/IOSystem.h"
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#include "../include/aiMesh.h"
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#include "../include/aiScene.h"
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#include "../include/aiAssert.h"
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#include "3DSSpatialSort.h"
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using namespace Assimp;
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// ------------------------------------------------------------------------------------------------
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void Dot3DSImporter::GenNormals(Dot3DS::Mesh* sMesh)
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{
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// First generate face normals
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sMesh->mNormals.resize(sMesh->mPositions.size(),aiVector3D());
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for( unsigned int a = 0; a < sMesh->mFaces.size(); a++)
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{
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const Dot3DS::Face& face = sMesh->mFaces[a];
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// assume it is a triangle
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aiVector3D* pV1 = &sMesh->mPositions[face.i1];
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aiVector3D* pV2 = &sMesh->mPositions[face.i2];
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aiVector3D* pV3 = &sMesh->mPositions[face.i3];
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aiVector3D pDelta1 = *pV2 - *pV1;
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aiVector3D pDelta2 = *pV3 - *pV1;
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aiVector3D vNor = pDelta1 ^ pDelta2;
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//float fLength = vNor.Length();
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//if (0.0f != fLength)vNor /= fLength;
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sMesh->mNormals[face.i1] = vNor;
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sMesh->mNormals[face.i2] = vNor;
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sMesh->mNormals[face.i3] = vNor;
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}
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// calculate the position bounds so we have a reliable epsilon to
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// check position differences against
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// @Schrompf: This is the 6th time this snippet is repeated!
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aiVector3D minVec( 1e10f, 1e10f, 1e10f), maxVec( -1e10f, -1e10f, -1e10f);
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for( unsigned int a = 0; a < sMesh->mPositions.size(); a++)
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{
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minVec.x = std::min( minVec.x, sMesh->mPositions[a].x);
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minVec.y = std::min( minVec.y, sMesh->mPositions[a].y);
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minVec.z = std::min( minVec.z, sMesh->mPositions[a].z);
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maxVec.x = std::max( maxVec.x, sMesh->mPositions[a].x);
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maxVec.y = std::max( maxVec.y, sMesh->mPositions[a].y);
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maxVec.z = std::max( maxVec.z, sMesh->mPositions[a].z);
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}
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const float posEpsilon = (maxVec - minVec).Length() * 1e-5f;
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std::vector<aiVector3D> avNormals;
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avNormals.resize(sMesh->mNormals.size());
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// now generate the spatial sort tree
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D3DSSpatialSorter sSort(sMesh);
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for( std::vector<Dot3DS::Face>::iterator
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i = sMesh->mFaces.begin();
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i != sMesh->mFaces.end();++i)
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{
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std::vector<unsigned int> poResult;
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// need to repeat the code for all three vertices of the triangle
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// vertex 1
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sSort.FindPositions(sMesh->mPositions[(*i).i1],(*i).iSmoothGroup,
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posEpsilon,poResult);
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aiVector3D vNormals;
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float fDiv = 0.0f;
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for (std::vector<unsigned int>::const_iterator
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a = poResult.begin();
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a != poResult.end();++a)
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{
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vNormals += sMesh->mNormals[(*a)];
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fDiv += 1.0f;
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}
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vNormals.x /= fDiv;
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vNormals.y /= fDiv;
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vNormals.z /= fDiv;
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vNormals.Normalize();
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avNormals[(*i).i1] = vNormals;
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poResult.clear();
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// vertex 2
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sSort.FindPositions(sMesh->mPositions[(*i).i2],(*i).iSmoothGroup,
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posEpsilon,poResult);
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vNormals = aiVector3D();
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fDiv = 0.0f;
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for (std::vector<unsigned int>::const_iterator
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a = poResult.begin();
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a != poResult.end();++a)
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{
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vNormals += sMesh->mNormals[(*a)];
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fDiv += 1.0f;
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}
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vNormals.x /= fDiv;
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vNormals.y /= fDiv;
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vNormals.z /= fDiv;
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vNormals.Normalize();
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avNormals[(*i).i2] = vNormals;
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poResult.clear();
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// vertex 3
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sSort.FindPositions(sMesh->mPositions[(*i).i3],(*i).iSmoothGroup,
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posEpsilon ,poResult);
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vNormals = aiVector3D();
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fDiv = 0.0f;
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for (std::vector<unsigned int>::const_iterator
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a = poResult.begin();
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a != poResult.end();++a)
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{
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vNormals += sMesh->mNormals[(*a)];
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fDiv += 1.0f;
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}
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vNormals.x /= fDiv;
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vNormals.y /= fDiv;
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vNormals.z /= fDiv;
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vNormals.Normalize();
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avNormals[(*i).i3] = vNormals;
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}
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sMesh->mNormals = avNormals;
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return;
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} |