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// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h
#include "CMeshManipulator.h"
#include "ISkinnedMesh.h"
#include "SMesh.h"
#include "CMeshBuffer.h"
#include "SAnimatedMesh.h"
#include "os.h"
#include "triangle3d.h"
namespace irr
{
namespace scene
{
static inline core::vector3df getAngleWeight(const core::vector3df& v1,
const core::vector3df& v2,
const core::vector3df& v3)
{
// Calculate this triangle's weight for each of its three vertices
// start by calculating the lengths of its sides
const f32 a = v2.getDistanceFromSQ(v3);
const f32 asqrt = sqrtf(a);
const f32 b = v1.getDistanceFromSQ(v3);
const f32 bsqrt = sqrtf(b);
const f32 c = v1.getDistanceFromSQ(v2);
const f32 csqrt = sqrtf(c);
// use them to find the angle at each vertex
return core::vector3df(
acosf((b + c - a) / (2.f * bsqrt * csqrt)),
acosf((-b + c + a) / (2.f * asqrt * csqrt)),
acosf((b - c + a) / (2.f * bsqrt * asqrt)));
}
namespace
{
template <typename T>
void recalculateNormalsT(IMeshBuffer* buffer, bool smooth, bool angleWeighted)
{
const u32 vtxcnt = buffer->getVertexCount();
const u32 idxcnt = buffer->getIndexCount();
const T* idx = reinterpret_cast<T*>(buffer->getIndices());
if (!smooth)
{
for (u32 i=0; i<idxcnt; i+=3)
{
const core::vector3df& v1 = buffer->getPosition(idx[i+0]);
const core::vector3df& v2 = buffer->getPosition(idx[i+1]);
const core::vector3df& v3 = buffer->getPosition(idx[i+2]);
const core::vector3df normal = core::plane3d<f32>(v1, v2, v3).Normal;
buffer->getNormal(idx[i+0]) = normal;
buffer->getNormal(idx[i+1]) = normal;
buffer->getNormal(idx[i+2]) = normal;
}
}
else
{
u32 i;
for ( i = 0; i!= vtxcnt; ++i )
buffer->getNormal(i).set(0.f, 0.f, 0.f);
for ( i=0; i<idxcnt; i+=3)
{
const core::vector3df& v1 = buffer->getPosition(idx[i+0]);
const core::vector3df& v2 = buffer->getPosition(idx[i+1]);
const core::vector3df& v3 = buffer->getPosition(idx[i+2]);
const core::vector3df normal = core::plane3d<f32>(v1, v2, v3).Normal;
core::vector3df weight(1.f,1.f,1.f);
if (angleWeighted)
weight = irr::scene::getAngleWeight(v1,v2,v3); // writing irr::scene:: necessary for borland
buffer->getNormal(idx[i+0]) += weight.X*normal;
buffer->getNormal(idx[i+1]) += weight.Y*normal;
buffer->getNormal(idx[i+2]) += weight.Z*normal;
}
for ( i = 0; i!= vtxcnt; ++i )
buffer->getNormal(i).normalize();
}
}
}
//! Recalculates all normals of the mesh buffer.
/** \param buffer: Mesh buffer on which the operation is performed. */
void CMeshManipulator::recalculateNormals(IMeshBuffer* buffer, bool smooth, bool angleWeighted) const
{
if (!buffer)
return;
if (buffer->getIndexType()==video::EIT_16BIT)
recalculateNormalsT<u16>(buffer, smooth, angleWeighted);
else
recalculateNormalsT<u32>(buffer, smooth, angleWeighted);
}
//! Recalculates all normals of the mesh.
//! \param mesh: Mesh on which the operation is performed.
void CMeshManipulator::recalculateNormals(scene::IMesh* mesh, bool smooth, bool angleWeighted) const
{
if (!mesh)
return;
if (mesh->getMeshType() == EAMT_SKINNED)
{
ISkinnedMesh *smesh = (ISkinnedMesh *) mesh;
smesh->resetAnimation();
}
const u32 bcount = mesh->getMeshBufferCount();
for ( u32 b=0; b<bcount; ++b)
recalculateNormals(mesh->getMeshBuffer(b), smooth, angleWeighted);
if (mesh->getMeshType() == EAMT_SKINNED)
{
ISkinnedMesh *smesh = (ISkinnedMesh *) mesh;
smesh->refreshJointCache();
}
}
//! Clones a static IMesh into a modifyable SMesh.
// not yet 32bit
SMesh* CMeshManipulator::createMeshCopy(scene::IMesh* mesh) const
{
if (!mesh)
return 0;
SMesh* clone = new SMesh();
const u32 meshBufferCount = mesh->getMeshBufferCount();
for ( u32 b=0; b<meshBufferCount; ++b)
{
const IMeshBuffer* const mb = mesh->getMeshBuffer(b);
switch(mb->getVertexType())
{
case video::EVT_STANDARD:
{
SMeshBuffer* buffer = new SMeshBuffer();
buffer->Material = mb->getMaterial();
const u32 vcount = mb->getVertexCount();
buffer->Vertices.reallocate(vcount);
video::S3DVertex* vertices = (video::S3DVertex*)mb->getVertices();
for (u32 i=0; i < vcount; ++i)
buffer->Vertices.push_back(vertices[i]);
const u32 icount = mb->getIndexCount();
buffer->Indices.reallocate(icount);
const u16* indices = mb->getIndices();
for (u32 i=0; i < icount; ++i)
buffer->Indices.push_back(indices[i]);
clone->addMeshBuffer(buffer);
buffer->drop();
}
break;
case video::EVT_2TCOORDS:
{
SMeshBufferLightMap* buffer = new SMeshBufferLightMap();
buffer->Material = mb->getMaterial();
const u32 vcount = mb->getVertexCount();
buffer->Vertices.reallocate(vcount);
video::S3DVertex2TCoords* vertices = (video::S3DVertex2TCoords*)mb->getVertices();
for (u32 i=0; i < vcount; ++i)
buffer->Vertices.push_back(vertices[i]);
const u32 icount = mb->getIndexCount();
buffer->Indices.reallocate(icount);
const u16* indices = mb->getIndices();
for (u32 i=0; i < icount; ++i)
buffer->Indices.push_back(indices[i]);
clone->addMeshBuffer(buffer);
buffer->drop();
}
break;
case video::EVT_TANGENTS:
{
SMeshBufferTangents* buffer = new SMeshBufferTangents();
buffer->Material = mb->getMaterial();
const u32 vcount = mb->getVertexCount();
buffer->Vertices.reallocate(vcount);
video::S3DVertexTangents* vertices = (video::S3DVertexTangents*)mb->getVertices();
for (u32 i=0; i < vcount; ++i)
buffer->Vertices.push_back(vertices[i]);
const u32 icount = mb->getIndexCount();
buffer->Indices.reallocate(icount);
const u16* indices = mb->getIndices();
for (u32 i=0; i < icount; ++i)
buffer->Indices.push_back(indices[i]);
clone->addMeshBuffer(buffer);
buffer->drop();
}
break;
}// end switch
}// end for all mesh buffers
clone->BoundingBox = mesh->getBoundingBox();
return clone;
}
//! Returns amount of polygons in mesh.
s32 CMeshManipulator::getPolyCount(scene::IMesh* mesh) const
{
if (!mesh)
return 0;
s32 trianglecount = 0;
for (u32 g=0; g<mesh->getMeshBufferCount(); ++g)
trianglecount += mesh->getMeshBuffer(g)->getIndexCount() / 3;
return trianglecount;
}
//! Returns amount of polygons in mesh.
s32 CMeshManipulator::getPolyCount(scene::IAnimatedMesh* mesh) const
{
if (mesh && mesh->getFrameCount() != 0)
return getPolyCount(mesh->getMesh(0));
return 0;
}
//! create a new AnimatedMesh and adds the mesh to it
IAnimatedMesh * CMeshManipulator::createAnimatedMesh(scene::IMesh* mesh, scene::E_ANIMATED_MESH_TYPE type) const
{
return new SAnimatedMesh(mesh, type);
}
} // end namespace scene
} // end namespace irr
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