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Gefüllte Taubenbrust 2024-11-30 17:12:06 +01:00
parent 00ef9b14d0
commit 795f669c97
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20
irr/include/IMeshManipulator.h
View file

@ -41,26 +41,6 @@ public:
virtual void recalculateNormals(IMeshBuffer *buffer,
bool smooth = false, bool angleWeighted = false) const = 0;
//! Recalculates tangents, requires a tangent mesh
/** \param mesh Mesh on which the operation is performed.
\param recalculateNormals If the normals shall be recalculated, otherwise original normals of the mesh are used unchanged.
\param smooth If the normals shall be smoothed.
\param angleWeighted If the normals shall be smoothed in relation to their angles. More expensive, but also higher precision.
*/
virtual void recalculateTangents(IMesh* mesh,
bool recalculateNormals = false, bool smooth = false,
bool angleWeighted = false) const = 0;
//! Recalculates tangents, requires a tangent mesh buffer
/** \param buffer Meshbuffer on which the operation is performed.
\param recalculateNormals If the normals shall be recalculated, otherwise original normals of the buffer are used unchanged.
\param smooth If the normals shall be smoothed.
\param angleWeighted If the normals shall be smoothed in relation to their angles. More expensive, but also higher precision.
*/
virtual void recalculateTangents(IMeshBuffer* buffer,
bool recalculateNormals = false, bool smooth = false,
bool angleWeighted = false) const = 0;
//! Scales the actual mesh, not a scene node.
/** \param mesh Mesh on which the operation is performed.
\param factor Scale factor for each axis. */

329
irr/src/CMeshManipulator.cpp
View file

@ -80,335 +80,6 @@ void recalculateNormalsT(IMeshBuffer *buffer, bool smooth, bool angleWeighted)
}
}
namespace
{
void calculateTangents(
core::vector3df& normal,
core::vector3df& tangent,
core::vector3df& binormal,
const core::vector3df& vt1, const core::vector3df& vt2, const core::vector3df& vt3, // vertices
const core::vector2df& tc1, const core::vector2df& tc2, const core::vector2df& tc3) // texture coords
{
// choose one of them:
//#define USE_NVIDIA_GLH_VERSION // use version used by nvidia in glh headers
#define USE_IRR_VERSION
#ifdef USE_IRR_VERSION
core::vector3df v1 = vt1 - vt2;
core::vector3df v2 = vt3 - vt1;
normal = v2.crossProduct(v1);
normal.normalize();
// binormal
f32 deltaX1 = tc1.X - tc2.X;
f32 deltaX2 = tc3.X - tc1.X;
binormal = (v1 * deltaX2) - (v2 * deltaX1);
binormal.normalize();
// tangent
f32 deltaY1 = tc1.Y - tc2.Y;
f32 deltaY2 = tc3.Y - tc1.Y;
tangent = (v1 * deltaY2) - (v2 * deltaY1);
tangent.normalize();
// adjust
core::vector3df txb = tangent.crossProduct(binormal);
if (txb.dotProduct(normal) < 0.0f)
{
tangent *= -1.0f;
binormal *= -1.0f;
}
#endif // USE_IRR_VERSION
#ifdef USE_NVIDIA_GLH_VERSION
tangent.set(0, 0, 0);
binormal.set(0, 0, 0);
core::vector3df v1(vt2.X - vt1.X, tc2.X - tc1.X, tc2.Y - tc1.Y);
core::vector3df v2(vt3.X - vt1.X, tc3.X - tc1.X, tc3.Y - tc1.Y);
core::vector3df txb = v1.crossProduct(v2);
if (!core::iszero(txb.X))
{
tangent.X = -txb.Y / txb.X;
binormal.X = -txb.Z / txb.X;
}
v1.X = vt2.Y - vt1.Y;
v2.X = vt3.Y - vt1.Y;
txb = v1.crossProduct(v2);
if (!core::iszero(txb.X))
{
tangent.Y = -txb.Y / txb.X;
binormal.Y = -txb.Z / txb.X;
}
v1.X = vt2.Z - vt1.Z;
v2.X = vt3.Z - vt1.Z;
txb = v1.crossProduct(v2);
if (!core::iszero(txb.X))
{
tangent.Z = -txb.Y / txb.X;
binormal.Z = -txb.Z / txb.X;
}
tangent.normalize();
binormal.normalize();
normal = tangent.crossProduct(binormal);
normal.normalize();
binormal = tangent.crossProduct(normal);
binormal.normalize();
core::plane3d<f32> pl(vt1, vt2, vt3);
if (normal.dotProduct(pl.Normal) < 0.0f)
normal *= -1.0f;
#endif // USE_NVIDIA_GLH_VERSION
}
//! Recalculates tangents for a tangent mesh buffer
template <typename T>
void recalculateTangentsT(IMeshBuffer* buffer, bool recalculateNormals, bool smooth, bool angleWeighted)
{
if (!buffer || (buffer->getVertexType() != video::EVT_TANGENTS))
return;
const u32 vtxCnt = buffer->getVertexCount();
const u32 idxCnt = buffer->getIndexCount();
T* idx = reinterpret_cast<T*>(buffer->getIndices());
video::S3DVertexTangents* v =
(video::S3DVertexTangents*)buffer->getVertices();
if (smooth)
{
u32 i;
for (i = 0; i != vtxCnt; ++i)
{
if (recalculateNormals)
v[i].Normal.set(0.f, 0.f, 0.f);
v[i].Tangent.set(0.f, 0.f, 0.f);
v[i].Binormal.set(0.f, 0.f, 0.f);
}
//Each vertex gets the sum of the tangents and binormals from the faces around it
for (i = 0; i < idxCnt; i += 3)
{
// if this triangle is degenerate, skip it!
if (v[idx[i + 0]].Pos == v[idx[i + 1]].Pos ||
v[idx[i + 0]].Pos == v[idx[i + 2]].Pos ||
v[idx[i + 1]].Pos == v[idx[i + 2]].Pos
/*||
v[idx[i+0]].TCoords == v[idx[i+1]].TCoords ||
v[idx[i+0]].TCoords == v[idx[i+2]].TCoords ||
v[idx[i+1]].TCoords == v[idx[i+2]].TCoords */
)
continue;
//Angle-weighted normals look better, but are slightly more CPU intensive to calculate
core::vector3df weight(1.f, 1.f, 1.f);
if (angleWeighted)
weight = irr::scene::getAngleWeight(v[i + 0].Pos, v[i + 1].Pos, v[i + 2].Pos); // writing irr::scene:: necessary for borland
core::vector3df localNormal;
core::vector3df localTangent;
core::vector3df localBinormal;
calculateTangents(
localNormal,
localTangent,
localBinormal,
v[idx[i + 0]].Pos,
v[idx[i + 1]].Pos,
v[idx[i + 2]].Pos,
v[idx[i + 0]].TCoords,
v[idx[i + 1]].TCoords,
v[idx[i + 2]].TCoords);
if (recalculateNormals)
v[idx[i + 0]].Normal += localNormal * weight.X;
v[idx[i + 0]].Tangent += localTangent * weight.X;
v[idx[i + 0]].Binormal += localBinormal * weight.X;
calculateTangents(
localNormal,
localTangent,
localBinormal,
v[idx[i + 1]].Pos,
v[idx[i + 2]].Pos,
v[idx[i + 0]].Pos,
v[idx[i + 1]].TCoords,
v[idx[i + 2]].TCoords,
v[idx[i + 0]].TCoords);
if (recalculateNormals)
v[idx[i + 1]].Normal += localNormal * weight.Y;
v[idx[i + 1]].Tangent += localTangent * weight.Y;
v[idx[i + 1]].Binormal += localBinormal * weight.Y;
calculateTangents(
localNormal,
localTangent,
localBinormal,
v[idx[i + 2]].Pos,
v[idx[i + 0]].Pos,
v[idx[i + 1]].Pos,
v[idx[i + 2]].TCoords,
v[idx[i + 0]].TCoords,
v[idx[i + 1]].TCoords);
if (recalculateNormals)
v[idx[i + 2]].Normal += localNormal * weight.Z;
v[idx[i + 2]].Tangent += localTangent * weight.Z;
v[idx[i + 2]].Binormal += localBinormal * weight.Z;
}
// Normalize the tangents and binormals
if (recalculateNormals)
{
for (i = 0; i != vtxCnt; ++i)
v[i].Normal.normalize();
}
for (i = 0; i != vtxCnt; ++i)
{
v[i].Tangent.normalize();
v[i].Binormal.normalize();
}
}
else
{
core::vector3df localNormal;
for (u32 i = 0; i < idxCnt; i += 3)
{
calculateTangents(
localNormal,
v[idx[i + 0]].Tangent,
v[idx[i + 0]].Binormal,
v[idx[i + 0]].Pos,
v[idx[i + 1]].Pos,
v[idx[i + 2]].Pos,
v[idx[i + 0]].TCoords,
v[idx[i + 1]].TCoords,
v[idx[i + 2]].TCoords);
if (recalculateNormals)
v[idx[i + 0]].Normal = localNormal;
calculateTangents(
localNormal,
v[idx[i + 1]].Tangent,
v[idx[i + 1]].Binormal,
v[idx[i + 1]].Pos,
v[idx[i + 2]].Pos,
v[idx[i + 0]].Pos,
v[idx[i + 1]].TCoords,
v[idx[i + 2]].TCoords,
v[idx[i + 0]].TCoords);
if (recalculateNormals)
v[idx[i + 1]].Normal = localNormal;
calculateTangents(
localNormal,
v[idx[i + 2]].Tangent,
v[idx[i + 2]].Binormal,
v[idx[i + 2]].Pos,
v[idx[i + 0]].Pos,
v[idx[i + 1]].Pos,
v[idx[i + 2]].TCoords,
v[idx[i + 0]].TCoords,
v[idx[i + 1]].TCoords);
if (recalculateNormals)
v[idx[i + 2]].Normal = localNormal;
}
}
}
}
//! Recalculates tangents for a tangent mesh buffer
void CMeshManipulator::recalculateTangents(IMeshBuffer* buffer, bool recalculateNormals, bool smooth, bool angleWeighted) const
{
if (buffer && (buffer->getVertexType() == video::EVT_TANGENTS))
{
if (buffer->getIndexType() == video::EIT_16BIT)
recalculateTangentsT<u16>(buffer, recalculateNormals, smooth, angleWeighted);
else
recalculateTangentsT<u32>(buffer, recalculateNormals, smooth, angleWeighted);
}
}
//! Recalculates tangents for all tangent mesh buffers
void CMeshManipulator::recalculateTangents(IMesh* mesh, bool recalculateNormals, bool smooth, bool angleWeighted) const
{
if (!mesh)
return;
const u32 meshBufferCount = mesh->getMeshBufferCount();
for (u32 b = 0; b < meshBufferCount; ++b)
{
recalculateTangents(mesh->getMeshBuffer(b), recalculateNormals, smooth, angleWeighted);
}
}
namespace
{
//! Creates a planar texture mapping on the meshbuffer
template<typename T>
void makePlanarTextureMappingT(scene::IMeshBuffer* buffer, f32 resolution)
{
u32 idxcnt = buffer->getIndexCount();
T* idx = reinterpret_cast<T*>(buffer->getIndices());
for (u32 i = 0; i < idxcnt; i += 3)
{
core::plane3df p(buffer->getPosition(idx[i + 0]), buffer->getPosition(idx[i + 1]), buffer->getPosition(idx[i + 2]));
p.Normal.X = fabsf(p.Normal.X);
p.Normal.Y = fabsf(p.Normal.Y);
p.Normal.Z = fabsf(p.Normal.Z);
// calculate planar mapping worldspace coordinates
if (p.Normal.X > p.Normal.Y && p.Normal.X > p.Normal.Z)
{
for (u32 o = 0; o != 3; ++o)
{
buffer->getTCoords(idx[i + o]).X = buffer->getPosition(idx[i + o]).Y * resolution;
buffer->getTCoords(idx[i + o]).Y = buffer->getPosition(idx[i + o]).Z * resolution;
}
}
else
if (p.Normal.Y > p.Normal.X && p.Normal.Y > p.Normal.Z)
{
for (u32 o = 0; o != 3; ++o)
{
buffer->getTCoords(idx[i + o]).X = buffer->getPosition(idx[i + o]).X * resolution;
buffer->getTCoords(idx[i + o]).Y = buffer->getPosition(idx[i + o]).Z * resolution;
}
}
else
{
for (u32 o = 0; o != 3; ++o)
{
buffer->getTCoords(idx[i + o]).X = buffer->getPosition(idx[i + o]).X * resolution;
buffer->getTCoords(idx[i + o]).Y = buffer->getPosition(idx[i + o]).Y * resolution;
}
}
}
}
}
//! 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

6
irr/src/CMeshManipulator.h
View file

@ -29,12 +29,6 @@ public:
\param smooth: Whether to use smoothed normals. */
void recalculateNormals(IMeshBuffer *buffer, bool smooth = false, bool angleWeighted = false) const override;
//! Recalculates tangents, requires a tangent mesh buffer
virtual void recalculateTangents(IMeshBuffer* buffer, bool recalculateNormals = false, bool smooth = false, bool angleWeighted = false) const _IRR_OVERRIDE_;
//! Recalculates tangents, requires a tangent mesh
virtual void recalculateTangents(IMesh* mesh, bool recalculateNormals = false, bool smooth = false, bool angleWeighted = false) const _IRR_OVERRIDE_;
//! Clones a static IMesh into a modifiable SMesh.
SMesh *createMeshCopy(scene::IMesh *mesh) const override;