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Added mesh generation of normals and tangents 

Former-commit-id: 42b29acf5701b19156d6966b402baf11c87f3476
This commit is contained in:
Lynix 2013-01-27 18:39:32 +01:00
parent cf47081224
commit 85c3224752
2 changed files with 159 additions and 0 deletions
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4
include/Nazara/Utility/Mesh.hpp
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@ -55,6 +55,10 @@ class NAZARA_API NzMesh : public NzResource, NzResourceListener
bool CreateStatic();
void Destroy();
void GenerateNormals();
void GenerateNormalsAndTangents();
void GenerateTangents();
const NzAxisAlignedBox& GetAABB() const;
NzString GetAnimation() const;
nzAnimationType GetAnimationType() const;

155
src/Nazara/Utility/Mesh.cpp
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@ -11,6 +11,8 @@
#include <Nazara/Utility/SkeletalMesh.hpp>
#include <Nazara/Utility/Skeleton.hpp>
#include <Nazara/Utility/SubMesh.hpp>
#include <Nazara/Utility/TriangleIterator.hpp>
#include <Nazara/Utility/VertexMapper.hpp>
#include <cstring>
#include <deque>
#include <map>
@ -262,6 +264,159 @@ void NzMesh::Destroy()
}
}
void NzMesh::GenerateNormals()
{
#if NAZARA_UTILITY_SAFE
if (!m_impl)
{
NazaraError("Mesh not created");
return;
}
#endif
for (NzSubMesh* subMesh : m_impl->subMeshes)
{
NzVertexMapper mapper1(subMesh);
unsigned int vertexCount = mapper1.GetVertexCount();
for (unsigned int i = 0; i < vertexCount; ++i)
mapper1.SetNormal(i, NzVector3f::Zero());
mapper1.Unmap();
NzTriangleIterator iterator(subMesh);
do
{
NzVector3f pos0 = iterator.GetPosition(0);
NzVector3f dv[2];
dv[0] = iterator.GetPosition(1) - pos0;
dv[1] = iterator.GetPosition(2) - pos0;
NzVector3f normal = dv[0].CrossProduct(dv[1]);
for (unsigned int i = 0; i < 3; ++i)
iterator.SetNormal(i, iterator.GetNormal(i) + normal);
}
while (iterator.Advance());
NzVertexMapper mapper2(subMesh);
for (unsigned int i = 0; i < vertexCount; ++i)
mapper2.SetNormal(i, NzVector3f::Normalize(mapper2.GetNormal(i)));
}
}
void NzMesh::GenerateNormalsAndTangents()
{
#if NAZARA_UTILITY_SAFE
if (!m_impl)
{
NazaraError("Mesh not created");
return;
}
#endif
for (NzSubMesh* subMesh : m_impl->subMeshes)
{
NzVertexMapper mapper1(subMesh);
unsigned int vertexCount = mapper1.GetVertexCount();
for (unsigned int i = 0; i < vertexCount; ++i)
{
mapper1.SetNormal(i, NzVector3f::Zero());
mapper1.SetTangent(i, NzVector3f::Zero());
}
mapper1.Unmap();
NzTriangleIterator iterator(subMesh);
do
{
NzVector3f pos0 = iterator.GetPosition(0);
NzVector2f uv0 = iterator.GetTexCoords(0);
NzVector3f dv[2];
dv[0] = iterator.GetPosition(1) - pos0;
dv[1] = iterator.GetPosition(2) - pos0;
NzVector3f normal = dv[0].CrossProduct(dv[1]);
NzVector2f duv[2];
duv[0] = iterator.GetTexCoords(1) - uv0;
duv[1] = iterator.GetTexCoords(2) - uv0;
float coef = 1.f / (duv[0].x*duv[1].y - duv[1].x*duv[0].y);
NzVector3f tangent;
tangent.x = coef * (dv[0].x*duv[1].y + dv[1].x*(-duv[0].y));
tangent.y = coef * (dv[0].y*duv[1].y + dv[1].y*(-duv[0].y));
tangent.z = coef * (dv[0].z*duv[1].y + dv[1].z*(-duv[0].y));
for (unsigned int i = 0; i < 3; ++i)
{
iterator.SetNormal(i, iterator.GetNormal(i) + normal);
iterator.SetTangent(i, iterator.GetTangent(i) + tangent);
}
}
while (iterator.Advance());
NzVertexMapper mapper2(subMesh);
for (unsigned int i = 0; i < vertexCount; ++i)
{
mapper2.SetNormal(i, NzVector3f::Normalize(mapper2.GetNormal(i)));
mapper2.SetTangent(i, NzVector3f::Normalize(mapper2.GetTangent(i)));
}
}
}
void NzMesh::GenerateTangents()
{
#if NAZARA_UTILITY_SAFE
if (!m_impl)
{
NazaraError("Mesh not created");
return;
}
#endif
for (NzSubMesh* subMesh : m_impl->subMeshes)
{
NzTriangleIterator iterator(subMesh);
do
{
NzVector3f pos0 = iterator.GetPosition(0);
NzVector2f uv0 = iterator.GetTexCoords(0);
NzVector3f dv[2];
dv[0] = iterator.GetPosition(1) - pos0;
dv[1] = iterator.GetPosition(2) - pos0;
NzVector2f duv[2];
duv[0] = iterator.GetTexCoords(1) - uv0;
duv[1] = iterator.GetTexCoords(2) - uv0;
float ds[2];
ds[0] = iterator.GetTexCoords(1).x - uv0.x;
ds[1] = iterator.GetTexCoords(2).x - uv0.x;
NzVector3f ppt;
ppt.x = ds[0]*dv[1].x - dv[0].x*ds[1];
ppt.y = ds[0]*dv[1].y - dv[0].y*ds[1];
ppt.z = ds[0]*dv[1].z - dv[0].z*ds[1];
ppt.Normalize();
for (unsigned int i = 0; i < 3; ++i)
{
NzVector3f normal = iterator.GetNormal(i);
float d = ppt.DotProduct(normal);
NzVector3f tangent = ppt - (d * normal);
iterator.SetTangent(i, tangent);
}
}
while (iterator.Advance());
}
}
const NzAxisAlignedBox& NzMesh::GetAABB() const
{
#if NAZARA_UTILITY_SAFE