// Copied from irrlicht
void recalculateTangents(scene::IMesh* mesh, bool recalculate_normals, bool smooth, bool angle_weighted)
{
if (!mesh)
return;
const u32 mesh_buffer_count = mesh->getMeshBufferCount();
for (u32 b = 0; b<mesh_buffer_count; ++b)
{
recalculateTangents(mesh->getMeshBuffer(b), recalculate_normals, smooth, angle_weighted);
}
}
// Copied from irrlicht
scene::IMesh* MeshTools::createMeshWithTangents(scene::IMesh* mesh,
bool(*predicate)(scene::IMeshBuffer*),
bool recalculate_normals, bool smooth,
bool angle_weighted,
bool calculate_tangents)
{
if (!mesh)
return 0;
// copy mesh and fill data into SMeshBufferTangents
const u32 mesh_buffer_count = mesh->getMeshBufferCount();
bool needs_normal_map = false;
for (u32 b = 0; b < mesh_buffer_count; ++b)
{
scene::IMeshBuffer* original = mesh->getMeshBuffer(b);
if (predicate(original))
{
needs_normal_map = true;
break;
}
}
if (!needs_normal_map)
{
return mesh;
}
scene::SMesh* clone = new scene::SMesh();
for (u32 b = 0; b<mesh_buffer_count; ++b)
{
scene::IMeshBuffer* original = mesh->getMeshBuffer(b);
const u32 idxCnt = original->getIndexCount();
const u16* idx = original->getIndices();
if (!predicate(original))
{
clone->addMeshBuffer(original);
continue;
}
scene::SMeshBufferTangents* buffer = new scene::SMeshBufferTangents();
buffer->Material = original->getMaterial();
buffer->Vertices.reallocate(idxCnt);
buffer->Indices.reallocate(idxCnt);
core::map<video::S3DVertexTangents, int> vertMap;
int vertLocation;
// copy vertices
const video::E_VERTEX_TYPE vType = original->getVertexType();
video::S3DVertexTangents vNew;
for (u32 i = 0; i<idxCnt; ++i)
{
switch (vType)
{
case video::EVT_STANDARD:
{
const video::S3DVertex* v =
(const video::S3DVertex*)original->getVertices();
vNew = video::S3DVertexTangents(
v[idx[i]].Pos, v[idx[i]].Normal, v[idx[i]].Color, v[idx[i]].TCoords);
}
break;
case video::EVT_2TCOORDS:
{
const video::S3DVertex2TCoords* v =
(const video::S3DVertex2TCoords*)original->getVertices();
vNew = video::S3DVertexTangents(
v[idx[i]].Pos, v[idx[i]].Normal, v[idx[i]].Color, v[idx[i]].TCoords);
}
break;
case video::EVT_TANGENTS:
{
const video::S3DVertexTangents* v =
(const video::S3DVertexTangents*)original->getVertices();
vNew = v[idx[i]];
}
break;
}
core::map<video::S3DVertexTangents, int>::Node* n = vertMap.find(vNew);
if (n)
{
vertLocation = n->getValue();
}
else
{
vertLocation = buffer->Vertices.size();
buffer->Vertices.push_back(vNew);
vertMap.insert(vNew, vertLocation);
}
// create new indices
buffer->Indices.push_back(vertLocation);
}
buffer->recalculateBoundingBox();
// add new buffer
clone->addMeshBuffer(buffer);
buffer->drop();
}
clone->recalculateBoundingBox();
if (calculate_tangents)
recalculateTangents(clone, recalculate_normals, smooth, angle_weighted);
scene::IMeshCache* meshCache = irr_driver->getSceneManager()->getMeshCache();
io::SNamedPath path = meshCache->getMeshName(mesh);
if (path.getPath() == "")
{
// This mesh is not in irrlicht cache, drop it directly
assert(mesh->getReferenceCount() == 1);
mesh->drop();
return clone;
}
else
{
// Cache the calcuated tangent mesh with path
irr_driver->removeMeshFromCache(mesh);
scene::SAnimatedMesh* amesh = new scene::SAnimatedMesh(clone);
clone->drop();
meshCache->addMesh(path, amesh);
if (World::getWorld())
{
irr_driver->grabAllTextures(amesh);
World::getWorld()->getTrack()->addCachedMesh(amesh);
return amesh;
}
amesh->drop();
return amesh;
}
}
// Copied from irrlicht
scene::IMesh* MeshTools::createMeshWithTangents(scene::IMesh* mesh, bool(*predicate)(scene::IMeshBuffer*),
bool recalculateNormals, bool smooth, bool angleWeighted, bool calculateTangents)
{
if (!mesh)
return 0;
// copy mesh and fill data into SMeshBufferTangents
scene::SMesh* clone = new scene::SMesh();
const u32 meshBufferCount = mesh->getMeshBufferCount();
bool needsNormalMap = false;
for (u32 b = 0; b < meshBufferCount; ++b)
{
scene::IMeshBuffer* original = mesh->getMeshBuffer(b);
if (predicate(original))
{
needsNormalMap = true;
break;
}
}
if (!needsNormalMap)
{
return mesh;
}
for (u32 b = 0; b<meshBufferCount; ++b)
{
scene::IMeshBuffer* original = mesh->getMeshBuffer(b);
const u32 idxCnt = original->getIndexCount();
const u16* idx = original->getIndices();
if (!predicate(original))
{
clone->addMeshBuffer(original);
continue;
}
scene::SMeshBufferTangents* buffer = new scene::SMeshBufferTangents();
buffer->Material = original->getMaterial();
buffer->Vertices.reallocate(idxCnt);
buffer->Indices.reallocate(idxCnt);
core::map<video::S3DVertexTangents, int> vertMap;
int vertLocation;
// copy vertices
const video::E_VERTEX_TYPE vType = original->getVertexType();
video::S3DVertexTangents vNew;
for (u32 i = 0; i<idxCnt; ++i)
{
switch (vType)
{
case video::EVT_STANDARD:
{
const video::S3DVertex* v =
(const video::S3DVertex*)original->getVertices();
vNew = video::S3DVertexTangents(
v[idx[i]].Pos, v[idx[i]].Normal, v[idx[i]].Color, v[idx[i]].TCoords);
}
break;
case video::EVT_2TCOORDS:
{
const video::S3DVertex2TCoords* v =
(const video::S3DVertex2TCoords*)original->getVertices();
vNew = video::S3DVertexTangents(
v[idx[i]].Pos, v[idx[i]].Normal, v[idx[i]].Color, v[idx[i]].TCoords);
}
break;
case video::EVT_TANGENTS:
{
const video::S3DVertexTangents* v =
(const video::S3DVertexTangents*)original->getVertices();
vNew = v[idx[i]];
}
break;
}
core::map<video::S3DVertexTangents, int>::Node* n = vertMap.find(vNew);
if (n)
{
vertLocation = n->getValue();
}
else
{
vertLocation = buffer->Vertices.size();
buffer->Vertices.push_back(vNew);
vertMap.insert(vNew, vertLocation);
}
// create new indices
buffer->Indices.push_back(vertLocation);
}
buffer->recalculateBoundingBox();
// add new buffer
clone->addMeshBuffer(buffer);
buffer->drop();
}
clone->recalculateBoundingBox();
if (calculateTangents)
recalculateTangents(clone, recalculateNormals, smooth, angleWeighted);
irr_driver->removeMeshFromCache(mesh);
return clone;
}
