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6b19031200
vtk-m/vtkm/rendering/raytracing/TriangleIntersector.h
Sujin Philip 6b19031200 Cleanup includes of ExecutionWholeArray.h
2018-01-02 10:30:16 -05:00

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//============================================================================
// Copyright (c) Kitware, Inc.
// All rights reserved.
// See LICENSE.txt for details.
// This software is distributed WITHOUT ANY WARRANTY; without even
// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
// PURPOSE. See the above copyright notice for more information.
//
// Copyright 2015 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
// Copyright 2015 UT-Battelle, LLC.
// Copyright 2015 Los Alamos National Security.
//
// Under the terms of Contract DE-NA0003525 with NTESS,
// the U.S. Government retains certain rights in this software.
//
// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
// Laboratory (LANL), the U.S. Government retains certain rights in
// this software.
//============================================================================
#ifndef vtk_m_rendering_raytracing_TriagnleIntersector_h
#define vtk_m_rendering_raytracing_TriagnleIntersector_h
#include <cstring>
#include <vtkm/cont/ArrayHandle.h>
#include <vtkm/cont/ArrayHandleCompositeVector.h>
#include <vtkm/rendering/raytracing/BoundingVolumeHierarchy.h>
#include <vtkm/rendering/raytracing/Ray.h>
#include <vtkm/rendering/raytracing/RayOperations.h>
#include <vtkm/worklet/DispatcherMapField.h>
#include <vtkm/worklet/WorkletMapField.h>
namespace vtkm
{
namespace rendering
{
namespace raytracing
{
namespace
{
enum : vtkm::Int32
{
END_FLAG2 = -1000000000
};
}
template <typename TriIntersector>
class TriLeafIntersector
{
public:
template <typename PointPortalType, typename LeafPortalType, typename Precision>
VTKM_EXEC inline void IntersectLeaf(const vtkm::Int32& currentNode,
const Precision& originX,
const Precision& originY,
const Precision& originZ,
const Precision& dirx,
const Precision& diry,
const Precision& dirz,
const PointPortalType& points,
vtkm::Id& hitIndex,
Precision& closestDistance,
Precision& minU,
Precision& minV,
LeafPortalType Leafs,
const Precision& minDistance) const
{
vtkm::Vec<Int32, 4> leafnode = Leafs.Get(currentNode);
vtkm::Vec<Precision, 3> a = vtkm::Vec<Precision, 3>(points.Get(leafnode[1]));
vtkm::Vec<Precision, 3> b = vtkm::Vec<Precision, 3>(points.Get(leafnode[2]));
vtkm::Vec<Precision, 3> c = vtkm::Vec<Precision, 3>(points.Get(leafnode[3]));
TriIntersector intersector;
Precision distance = -1.;
Precision u, v;
intersector.IntersectTri(a, b, c, dirx, diry, dirz, distance, u, v, originX, originY, originZ);
if (distance != -1. && distance < closestDistance && distance > minDistance)
{
closestDistance = distance;
minU = u;
minV = v;
hitIndex = currentNode;
}
}
};
class Moller
{
public:
template <typename Precision>
VTKM_EXEC void IntersectTri(const vtkm::Vec<Precision, 3>& a,
const vtkm::Vec<Precision, 3>& b,
const vtkm::Vec<Precision, 3>& c,
const Precision& dirx,
const Precision& diry,
const Precision& dirz,
Precision& distance,
Precision& u,
Precision& v,
const Precision& originX,
const Precision& originY,
const Precision& originZ) const
{
const vtkm::Float32 EPSILON2 = 0.0001f;
vtkm::Vec<Precision, 3> e1 = b - a;
vtkm::Vec<Precision, 3> e2 = c - a;
vtkm::Vec<Precision, 3> p;
p[0] = diry * e2[2] - dirz * e2[1];
p[1] = dirz * e2[0] - dirx * e2[2];
p[2] = dirx * e2[1] - diry * e2[0];
Precision dot = e1[0] * p[0] + e1[1] * p[1] + e1[2] * p[2];
if (dot != 0.f)
{
dot = 1.f / dot;
vtkm::Vec<Precision, 3> t;
t[0] = originX - a[0];
t[1] = originY - a[1];
t[2] = originZ - a[2];
u = (t[0] * p[0] + t[1] * p[1] + t[2] * p[2]) * dot;
if (u >= (0.f - EPSILON2) && u <= (1.f + EPSILON2))
{
vtkm::Vec<Precision, 3> q; // = t % e1;
q[0] = t[1] * e1[2] - t[2] * e1[1];
q[1] = t[2] * e1[0] - t[0] * e1[2];
q[2] = t[0] * e1[1] - t[1] * e1[0];
v = (dirx * q[0] + diry * q[1] + dirz * q[2]) * dot;
if (v >= (0.f - EPSILON2) && v <= (1.f + EPSILON2) && !(u + v > 1.f))
{
distance = (e2[0] * q[0] + e2[1] * q[1] + e2[2] * q[2]) * dot;
}
}
}
}
}; //Moller
// TODO: optimization for sorting ray dims before this call.
// This is called multiple times and kz,kx, and ky are
// constant for the ray
template <typename Precision>
class WaterTight
{
public:
VTKM_EXEC
inline void FindDir(const vtkm::Vec<Precision, 3>& dir,
Precision& sx,
Precision& sy,
Precision& sz,
vtkm::Int32& kx,
vtkm::Int32& ky,
vtkm::Int32& kz) const
{
//Find max ray direction
kz = 0;
if (vtkm::Abs(dir[0]) > vtkm::Abs(dir[1]))
{
if (vtkm::Abs(dir[0]) > vtkm::Abs(dir[2]))
kz = 0;
else
kz = 2;
}
else
{
if (vtkm::Abs(dir[1]) > vtkm::Abs(dir[2]))
kz = 1;
else
kz = 2;
}
kx = kz + 1;
if (kx == 3)
kx = 0;
ky = kx + 1;
if (ky == 3)
ky = 0;
if (dir[kz] < 0.f)
{
vtkm::Int32 temp = ky;
ky = kx;
kx = temp;
}
sx = dir[kx] / dir[kz];
sy = dir[ky] / dir[kz];
sz = 1.f / dir[kz];
}
VTKM_EXEC_CONT
inline void IntersectTri(const vtkm::Vec<Precision, 3>& a,
const vtkm::Vec<Precision, 3>& b,
const vtkm::Vec<Precision, 3>& c,
const Precision& dirx,
const Precision& diry,
const Precision& dirz,
Precision& distance,
Precision& u,
Precision& v,
const Precision& originX,
const Precision& originY,
const Precision& originZ) const
{
vtkm::Vec<Precision, 3> dir;
dir[0] = dirx;
dir[1] = diry;
dir[2] = dirz;
//Find max ray direction
int kz = 0;
if (vtkm::Abs(dir[0]) > vtkm::Abs(dir[1]))
{
if (vtkm::Abs(dir[0]) > vtkm::Abs(dir[2]))
kz = 0;
else
kz = 2;
}
else
{
if (vtkm::Abs(dir[1]) > vtkm::Abs(dir[2]))
kz = 1;
else
kz = 2;
}
vtkm::Int32 kx = kz + 1;
if (kx == 3)
kx = 0;
vtkm::Int32 ky = kx + 1;
if (ky == 3)
ky = 0;
if (dir[kz] < 0.f)
{
vtkm::Int32 temp = ky;
ky = kx;
kx = temp;
}
Precision Sx = dir[kx] / dir[kz];
Precision Sy = dir[ky] / dir[kz];
Precision Sz = 1.f / dir[kz];
vtkm::Vec<Precision, 3> A, B, C;
A[0] = a[0] - originX;
A[1] = a[1] - originY;
A[2] = a[2] - originZ;
B[0] = b[0] - originX;
B[1] = b[1] - originY;
B[2] = b[2] - originZ;
C[0] = c[0] - originX;
C[1] = c[1] - originY;
C[2] = c[2] - originZ;
const Precision Ax = A[kx] - Sx * A[kz];
const Precision Ay = A[ky] - Sy * A[kz];
const Precision Bx = B[kx] - Sx * B[kz];
const Precision By = B[ky] - Sy * B[kz];
const Precision Cx = C[kx] - Sx * C[kz];
const Precision Cy = C[ky] - Sy * C[kz];
//scaled barycentric coords
u = Cx * By - Cy * Bx;
v = Ax * Cy - Ay * Cx;
Precision w = Bx * Ay - By * Ax;
if (u == 0.f || v == 0.f || w == 0.f)
{
vtkm::Float64 CxBy = vtkm::Float64(Cx) * vtkm::Float64(By);
vtkm::Float64 CyBx = vtkm::Float64(Cy) * vtkm::Float64(Bx);
u = vtkm::Float32(CxBy - CyBx);
vtkm::Float64 AxCy = vtkm::Float64(Ax) * vtkm::Float64(Cy);
vtkm::Float64 AyCx = vtkm::Float64(Ay) * vtkm::Float64(Cx);
v = vtkm::Float32(AxCy - AyCx);
vtkm::Float64 BxAy = vtkm::Float64(Bx) * vtkm::Float64(Ay);
vtkm::Float64 ByAx = vtkm::Float64(By) * vtkm::Float64(Ax);
w = vtkm::Float32(BxAy - ByAx);
}
Precision low = vtkm::Min(u, vtkm::Min(v, w));
Precision high = vtkm::Max(u, vtkm::Max(v, w));
bool invalid = (low < 0.) && (high > 0.);
Precision det = u + v + w;
if (det == 0.)
invalid = true;
const Precision Az = Sz * A[kz];
const Precision Bz = Sz * B[kz];
const Precision Cz = Sz * C[kz];
det = 1.f / det;
u = u * det;
v = v * det;
distance = (u * Az + v * Bz + w * det * Cz);
u = v;
v = w * det;
if (invalid)
distance = -1.;
}
VTKM_EXEC
inline void IntersectTriSn(const vtkm::Vec<Precision, 3>& a,
const vtkm::Vec<Precision, 3>& b,
const vtkm::Vec<Precision, 3>& c,
const Precision& sx,
const Precision& sy,
const Precision& sz,
const vtkm::Int32& kx,
const vtkm::Int32& ky,
const vtkm::Int32& kz,
Precision& distance,
Precision& u,
Precision& v,
const Precision& originX,
const Precision& originY,
const Precision& originZ) const
{
vtkm::Vec<Precision, 3> A, B, C;
A[0] = a[0] - originX;
A[1] = a[1] - originY;
A[2] = a[2] - originZ;
B[0] = b[0] - originX;
B[1] = b[1] - originY;
B[2] = b[2] - originZ;
C[0] = c[0] - originX;
C[1] = c[1] - originY;
C[2] = c[2] - originZ;
const Precision Ax = A[kx] - sx * A[kz];
const Precision Ay = A[ky] - sy * A[kz];
const Precision Bx = B[kx] - sx * B[kz];
const Precision By = B[ky] - sy * B[kz];
const Precision Cx = C[kx] - sx * C[kz];
const Precision Cy = C[ky] - sy * C[kz];
//scaled barycentric coords
u = Cx * By - Cy * Bx;
v = Ax * Cy - Ay * Cx;
Precision w = Bx * Ay - By * Ax;
if (u == 0.f || v == 0.f || w == 0.f)
{
vtkm::Float64 CxBy = vtkm::Float64(Cx) * vtkm::Float64(By);
vtkm::Float64 CyBx = vtkm::Float64(Cy) * vtkm::Float64(Bx);
u = vtkm::Float32(CxBy - CyBx);
vtkm::Float64 AxCy = vtkm::Float64(Ax) * vtkm::Float64(Cy);
vtkm::Float64 AyCx = vtkm::Float64(Ay) * vtkm::Float64(Cx);
v = vtkm::Float32(AxCy - AyCx);
vtkm::Float64 BxAy = vtkm::Float64(Bx) * vtkm::Float64(Ay);
vtkm::Float64 ByAx = vtkm::Float64(By) * vtkm::Float64(Ax);
w = vtkm::Float32(BxAy - ByAx);
}
Precision low = vtkm::Min(u, vtkm::Min(v, w));
Precision high = vtkm::Max(u, vtkm::Max(v, w));
bool invalid = (low < 0.) && (high > 0.);
Precision det = u + v + w;
if (det == 0.)
invalid = true;
const Precision Az = sz * A[kz];
const Precision Bz = sz * B[kz];
const Precision Cz = sz * C[kz];
det = 1.f / det;
u = u * det;
v = v * det;
distance = (u * Az + v * Bz + w * det * Cz);
u = v;
v = w * det;
if (invalid)
distance = -1.;
}
}; //WaterTight
//
// Double precision specialization
//
template <>
class WaterTight<vtkm::Float64>
{
public:
VTKM_EXEC
inline void FindDir(const vtkm::Vec<vtkm::Float64, 3>& dir,
vtkm::Float64& sx,
vtkm::Float64& sy,
vtkm::Float64& sz,
vtkm::Int32& kx,
vtkm::Int32& ky,
vtkm::Int32& kz) const
{
//Find max ray direction
kz = 0;
if (vtkm::Abs(dir[0]) > vtkm::Abs(dir[1]))
{
if (vtkm::Abs(dir[0]) > vtkm::Abs(dir[2]))
kz = 0;
else
kz = 2;
}
else
{
if (vtkm::Abs(dir[1]) > vtkm::Abs(dir[2]))
kz = 1;
else
kz = 2;
}
kx = kz + 1;
if (kx == 3)
kx = 0;
ky = kx + 1;
if (ky == 3)
ky = 0;
if (dir[kz] < 0.f)
{
vtkm::Int32 temp = ky;
ky = kx;
kx = temp;
}
sx = dir[kx] / dir[kz];
sy = dir[ky] / dir[kz];
sz = 1.f / dir[kz];
}
VTKM_EXEC
inline void IntersectTri(const vtkm::Vec<vtkm::Float64, 3>& a,
const vtkm::Vec<vtkm::Float64, 3>& b,
const vtkm::Vec<vtkm::Float64, 3>& c,
const vtkm::Float64& dirx,
const vtkm::Float64& diry,
const vtkm::Float64& dirz,
vtkm::Float64& distance,
vtkm::Float64& u,
vtkm::Float64& v,
const vtkm::Float64& originX,
const vtkm::Float64& originY,
const vtkm::Float64& originZ) const
{
vtkm::Vec<vtkm::Float64, 3> dir;
dir[0] = dirx;
dir[1] = diry;
dir[2] = dirz;
//Find max ray direction
int kz = 0;
if (vtkm::Abs(dir[0]) > vtkm::Abs(dir[1]))
{
if (vtkm::Abs(dir[0]) > vtkm::Abs(dir[2]))
kz = 0;
else
kz = 2;
}
else
{
if (vtkm::Abs(dir[1]) > vtkm::Abs(dir[2]))
kz = 1;
else
kz = 2;
}
vtkm::Int32 kx = kz + 1;
if (kx == 3)
kx = 0;
vtkm::Int32 ky = kx + 1;
if (ky == 3)
ky = 0;
if (dir[kz] < 0.f)
{
vtkm::Int32 temp = ky;
ky = kx;
kx = temp;
}
vtkm::Float64 Sx = dir[kx] / dir[kz];
vtkm::Float64 Sy = dir[ky] / dir[kz];
vtkm::Float64 Sz = 1. / dir[kz];
vtkm::Vec<vtkm::Float64, 3> A, B, C;
A[0] = a[0] - originX;
A[1] = a[1] - originY;
A[2] = a[2] - originZ;
B[0] = b[0] - originX;
B[1] = b[1] - originY;
B[2] = b[2] - originZ;
C[0] = c[0] - originX;
C[1] = c[1] - originY;
C[2] = c[2] - originZ;
const vtkm::Float64 Ax = A[kx] - Sx * A[kz];
const vtkm::Float64 Ay = A[ky] - Sy * A[kz];
const vtkm::Float64 Bx = B[kx] - Sx * B[kz];
const vtkm::Float64 By = B[ky] - Sy * B[kz];
const vtkm::Float64 Cx = C[kx] - Sx * C[kz];
const vtkm::Float64 Cy = C[ky] - Sy * C[kz];
//scaled barycentric coords
u = Cx * By - Cy * Bx;
v = Ax * Cy - Ay * Cx;
vtkm::Float64 w = Bx * Ay - By * Ax;
vtkm::Float64 low = vtkm::Min(u, vtkm::Min(v, w));
vtkm::Float64 high = vtkm::Max(u, vtkm::Max(v, w));
bool invalid = (low < 0.) && (high > 0.);
vtkm::Float64 det = u + v + w;
if (det == 0.)
invalid = true;
const vtkm::Float64 Az = Sz * A[kz];
const vtkm::Float64 Bz = Sz * B[kz];
const vtkm::Float64 Cz = Sz * C[kz];
det = 1. / det;
u = u * det;
v = v * det;
distance = (u * Az + v * Bz + w * det * Cz);
u = v;
v = w * det;
if (invalid)
distance = -1.;
}
VTKM_EXEC
inline void IntersectTriSn(const vtkm::Vec<vtkm::Float64, 3>& a,
const vtkm::Vec<vtkm::Float64, 3>& b,
const vtkm::Vec<vtkm::Float64, 3>& c,
const vtkm::Float64& sx,
const vtkm::Float64& sy,
const vtkm::Float64& sz,
const vtkm::Int32& kx,
const vtkm::Int32& ky,
const vtkm::Int32& kz,
vtkm::Float64& distance,
vtkm::Float64& u,
vtkm::Float64& v,
const vtkm::Float64& originX,
const vtkm::Float64& originY,
const vtkm::Float64& originZ) const
{
vtkm::Vec<vtkm::Float64, 3> A, B, C;
A[0] = a[0] - originX;
A[1] = a[1] - originY;
A[2] = a[2] - originZ;
B[0] = b[0] - originX;
B[1] = b[1] - originY;
B[2] = b[2] - originZ;
C[0] = c[0] - originX;
C[1] = c[1] - originY;
C[2] = c[2] - originZ;
const vtkm::Float64 Ax = A[kx] - sx * A[kz];
const vtkm::Float64 Ay = A[ky] - sy * A[kz];
const vtkm::Float64 Bx = B[kx] - sx * B[kz];
const vtkm::Float64 By = B[ky] - sy * B[kz];
const vtkm::Float64 Cx = C[kx] - sx * C[kz];
const vtkm::Float64 Cy = C[ky] - sy * C[kz];
//scaled barycentric coords
u = Cx * By - Cy * Bx;
v = Ax * Cy - Ay * Cx;
vtkm::Float64 w = Bx * Ay - By * Ax;
vtkm::Float64 low = vtkm::Min(u, vtkm::Min(v, w));
vtkm::Float64 high = vtkm::Max(u, vtkm::Max(v, w));
bool invalid = (low < 0.) && (high > 0.);
vtkm::Float64 det = u + v + w;
if (det == 0.)
invalid = true;
const vtkm::Float64 Az = sz * A[kz];
const vtkm::Float64 Bz = sz * B[kz];
const vtkm::Float64 Cz = sz * C[kz];
det = 1. / det;
u = u * det;
v = v * det;
distance = (u * Az + v * Bz + w * det * Cz);
u = v;
v = w * det;
if (invalid)
distance = -1.;
}
}; //WaterTight
template <typename BVHPortalType, typename RayPrecision>
VTKM_EXEC inline bool IntersectAABB(const BVHPortalType& bvh,
const vtkm::Int32& currentNode,
const RayPrecision& originDirX,
const RayPrecision& originDirY,
const RayPrecision& originDirZ,
const RayPrecision& invDirx,
const RayPrecision& invDiry,
const RayPrecision& invDirz,
const RayPrecision& closestDistance,
bool& hitLeftChild,
bool& hitRightChild,
const RayPrecision& minDistance) //Find hit after this distance
{
vtkm::Vec<vtkm::Float32, 4> first4 = bvh.Get(currentNode);
vtkm::Vec<vtkm::Float32, 4> second4 = bvh.Get(currentNode + 1);
vtkm::Vec<vtkm::Float32, 4> third4 = bvh.Get(currentNode + 2);
RayPrecision xmin0 = first4[0] * invDirx - originDirX;
RayPrecision ymin0 = first4[1] * invDiry - originDirY;
RayPrecision zmin0 = first4[2] * invDirz - originDirZ;
RayPrecision xmax0 = first4[3] * invDirx - originDirX;
RayPrecision ymax0 = second4[0] * invDiry - originDirY;
RayPrecision zmax0 = second4[1] * invDirz - originDirZ;
RayPrecision min0 = vtkm::Max(
vtkm::Max(vtkm::Max(vtkm::Min(ymin0, ymax0), vtkm::Min(xmin0, xmax0)), vtkm::Min(zmin0, zmax0)),
minDistance);
RayPrecision max0 = vtkm::Min(
vtkm::Min(vtkm::Min(vtkm::Max(ymin0, ymax0), vtkm::Max(xmin0, xmax0)), vtkm::Max(zmin0, zmax0)),
closestDistance);
hitLeftChild = (max0 >= min0);
RayPrecision xmin1 = second4[2] * invDirx - originDirX;
RayPrecision ymin1 = second4[3] * invDiry - originDirY;
RayPrecision zmin1 = third4[0] * invDirz - originDirZ;
RayPrecision xmax1 = third4[1] * invDirx - originDirX;
RayPrecision ymax1 = third4[2] * invDiry - originDirY;
RayPrecision zmax1 = third4[3] * invDirz - originDirZ;
RayPrecision min1 = vtkm::Max(
vtkm::Max(vtkm::Max(vtkm::Min(ymin1, ymax1), vtkm::Min(xmin1, xmax1)), vtkm::Min(zmin1, zmax1)),
minDistance);
RayPrecision max1 = vtkm::Min(
vtkm::Min(vtkm::Min(vtkm::Max(ymin1, ymax1), vtkm::Max(xmin1, xmax1)), vtkm::Max(zmin1, zmax1)),
closestDistance);
hitRightChild = (max1 >= min1);
return (min0 > min1);
}
template <typename T>
VTKM_EXEC inline void swap(T& a, T& b)
{
T tmp = a;
a = b;
b = tmp;
}
VTKM_EXEC
inline vtkm::Float32 up(const vtkm::Float32& a)
{
return (a > 0.f) ? a * (1.f + vtkm::Float32(2e-23)) : a * (1.f - vtkm::Float32(2e-23));
}
VTKM_EXEC
inline vtkm::Float32 down(const vtkm::Float32& a)
{
return (a > 0.f) ? a * (1.f - vtkm::Float32(2e-23)) : a * (1.f + vtkm::Float32(2e-23));
}
VTKM_EXEC
inline vtkm::Float32 upFast(const vtkm::Float32& a)
{
return a * (1.f + vtkm::Float32(2e-23));
}
VTKM_EXEC
inline vtkm::Float32 downFast(const vtkm::Float32& a)
{
return a * (1.f - vtkm::Float32(2e-23));
}
template <typename Device, typename LeafIntesectorType>
class TriangleIntersector
{
public:
typedef typename vtkm::cont::ArrayHandle<Vec<vtkm::Float32, 4>> Float4ArrayHandle;
typedef typename vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Int32, 2>> Int2Handle;
typedef typename vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Int32, 4>> Int4Handle;
typedef typename Float4ArrayHandle::ExecutionTypes<Device>::PortalConst Float4ArrayPortal;
typedef typename Int2Handle::ExecutionTypes<Device>::PortalConst Int2ArrayPortal;
typedef typename Int4Handle::ExecutionTypes<Device>::PortalConst Int4ArrayPortal;
class Intersector : public vtkm::worklet::WorkletMapField
{
private:
LeafIntesectorType LeafIntersector;
bool Occlusion;
Float4ArrayPortal FlatBVH;
Int4ArrayPortal Leafs;
VTKM_EXEC
inline vtkm::Float32 rcp(vtkm::Float32 f) const { return 1.0f / f; }
VTKM_EXEC
inline vtkm::Float32 rcp_safe(vtkm::Float32 f) const
{
return rcp((fabs(f) < 1e-8f) ? 1e-8f : f);
}
inline vtkm::Float64 rcp(vtkm::Float64 f) const { return 1.0 / f; }
VTKM_EXEC
inline vtkm::Float64 rcp_safe(vtkm::Float64 f) const
{
return rcp((fabs(f) < 1e-8f) ? 1e-8f : f);
}
public:
VTKM_CONT
Intersector(bool occlusion, LinearBVH& bvh)
: Occlusion(occlusion)
, FlatBVH(bvh.FlatBVH.PrepareForInput(Device()))
, Leafs(bvh.LeafNodes.PrepareForInput(Device()))
{
}
typedef void ControlSignature(FieldIn<>,
FieldIn<>,
FieldOut<>,
FieldIn<>,
FieldIn<>,
FieldOut<>,
FieldOut<>,
FieldOut<>,
WholeArrayIn<Vec3RenderingTypes>);
typedef void ExecutionSignature(_1, _2, _3, _4, _5, _6, _7, _8, _9);
template <typename PointPortalType, typename Precision>
VTKM_EXEC void operator()(const vtkm::Vec<Precision, 3>& rayDir,
const vtkm::Vec<Precision, 3>& rayOrigin,
Precision& distance,
const Precision& minDistance,
const Precision& maxDistance,
Precision& minU,
Precision& minV,
vtkm::Id& hitIndex,
const PointPortalType& points) const
{
Precision closestDistance = maxDistance;
distance = maxDistance;
hitIndex = -1;
Precision dirx = rayDir[0];
Precision diry = rayDir[1];
Precision dirz = rayDir[2];
Precision invDirx = rcp_safe(dirx);
Precision invDiry = rcp_safe(diry);
Precision invDirz = rcp_safe(dirz);
vtkm::Int32 currentNode;
vtkm::Int32 todo[64];
vtkm::Int32 stackptr = 0;
vtkm::Int32 barrier = END_FLAG2;
currentNode = 0;
todo[stackptr] = barrier;
Precision originX = rayOrigin[0];
Precision originY = rayOrigin[1];
Precision originZ = rayOrigin[2];
Precision originDirX = originX * invDirx;
Precision originDirY = originY * invDiry;
Precision originDirZ = originZ * invDirz;
while (currentNode != END_FLAG2)
{
if (currentNode > -1)
{
bool hitLeftChild, hitRightChild;
bool rightCloser = IntersectAABB(FlatBVH,
currentNode,
originDirX,
originDirY,
originDirZ,
invDirx,
invDiry,
invDirz,
closestDistance,
hitLeftChild,
hitRightChild,
minDistance);
if (!hitLeftChild && !hitRightChild)
{
currentNode = todo[stackptr];
stackptr--;
}
else
{
vtkm::Vec<vtkm::Float32, 4> children =
FlatBVH.Get(currentNode + 3); //Children.Get(currentNode);
vtkm::Int32 leftChild;
memcpy(&leftChild, &children[0], 4);
vtkm::Int32 rightChild;
memcpy(&rightChild, &children[1], 4);
currentNode = (hitLeftChild) ? leftChild : rightChild;
if (hitLeftChild && hitRightChild)
{
if (rightCloser)
{
currentNode = rightChild;
stackptr++;
todo[stackptr] = leftChild;
}
else
{
stackptr++;
todo[stackptr] = rightChild;
}
}
}
} // if inner node
if (currentNode < 0 && currentNode != barrier) //check register usage
{
currentNode = -currentNode - 1; //swap the neg address
LeafIntersector.IntersectLeaf(currentNode,
originX,
originY,
originZ,
dirx,
diry,
dirz,
points,
hitIndex,
closestDistance,
minU,
minV,
Leafs,
minDistance);
currentNode = todo[stackptr];
stackptr--;
} // if leaf node
} //while
if (hitIndex != -1)
distance = closestDistance;
} // ()
};
template <typename Precision>
class IntersectorHitIndex : public vtkm::worklet::WorkletMapField
{
private:
bool Occlusion;
Float4ArrayPortal FlatBVH;
Int4ArrayPortal Leafs;
LeafIntesectorType LeafIntersector;
VTKM_EXEC
inline vtkm::Float32 rcp(vtkm::Float32 f) const { return 1.0f / f; }
VTKM_EXEC
inline vtkm::Float64 rcp(vtkm::Float64 f) const { return 1.0 / f; }
VTKM_EXEC
inline vtkm::Float64 rcp_safe(vtkm::Float64 f) const
{
return rcp((fabs(f) < 1e-8f) ? 1e-8f : f);
}
inline vtkm::Float32 rcp_safe(vtkm::Float32 f) const
{
return rcp((fabs(f) < 1e-8f) ? 1e-8f : f);
}
public:
VTKM_CONT
IntersectorHitIndex(bool occlusion, LinearBVH& bvh)
: Occlusion(occlusion)
, FlatBVH(bvh.FlatBVH.PrepareForInput(Device()))
, Leafs(bvh.LeafNodes.PrepareForInput(Device()))
{
}
typedef void ControlSignature(FieldIn<>,
FieldOut<>,
WholeArrayIn<Vec3RenderingTypes>,
FieldOut<>,
FieldIn<>,
FieldIn<>,
FieldIn<>);
typedef void ExecutionSignature(_1, _2, _3, _4, _5, _6, _7);
template <typename PointPortalType>
VTKM_EXEC void operator()(const vtkm::Vec<Precision, 3>& rayDir,
vtkm::Id& hitIndex,
const PointPortalType& points,
Precision& distance,
const Precision& minDistance,
const Precision& maxDistance,
const vtkm::Vec<Precision, 3>& origin) const
{
Precision closestDistance = maxDistance;
hitIndex = -1;
Precision dirx = rayDir[0];
Precision diry = rayDir[1];
Precision dirz = rayDir[2];
Precision invDirx = rcp_safe(dirx);
Precision invDiry = rcp_safe(diry);
Precision invDirz = rcp_safe(dirz);
int currentNode;
vtkm::Int32 todo[64];
vtkm::Int32 stackptr = 0;
vtkm::Int32 barrier = END_FLAG2;
currentNode = 0;
todo[stackptr] = barrier;
Precision originX = origin[0];
Precision originY = origin[1];
Precision originZ = origin[2];
Precision originDirX = originX * invDirx;
Precision originDirY = originY * invDiry;
Precision originDirZ = originZ * invDirz;
while (currentNode != END_FLAG2)
{
if (currentNode > -1)
{
bool hitLeftChild, hitRightChild;
bool rightCloser = IntersectAABB(FlatBVH,
currentNode,
originDirX,
originDirY,
originDirZ,
invDirx,
invDiry,
invDirz,
closestDistance,
hitLeftChild,
hitRightChild,
minDistance);
if (!hitLeftChild && !hitRightChild)
{
currentNode = todo[stackptr];
stackptr--;
}
else
{
vtkm::Vec<vtkm::Float32, 4> children =
FlatBVH.Get(currentNode + 3); //Children.Get(currentNode);
vtkm::Int32 leftChild;
memcpy(&leftChild, &children[0], 4);
vtkm::Int32 rightChild;
memcpy(&rightChild, &children[1], 4);
currentNode = (hitLeftChild) ? leftChild : rightChild;
if (hitLeftChild && hitRightChild)
{
if (rightCloser)
{
currentNode = rightChild;
stackptr++;
todo[stackptr] = leftChild;
}
else
{
stackptr++;
todo[stackptr] = rightChild;
}
}
}
} // if inner node
if (currentNode < 0 && currentNode != barrier) //check register usage
{
currentNode = -currentNode - 1; //swap the neg address
Precision minU, minV;
LeafIntersector.IntersectLeaf(currentNode,
originX,
originY,
originZ,
dirx,
diry,
dirz,
points,
hitIndex,
closestDistance,
minU,
minV,
Leafs,
minDistance);
currentNode = todo[stackptr];
stackptr--;
} // if leaf node
} //while
if (hitIndex != -1)
distance = closestDistance;
} // ()
}; //class Intersector
class CellIndexFilter : public vtkm::worklet::WorkletMapField
{
protected:
Int4ArrayPortal Leafs;
public:
VTKM_CONT
CellIndexFilter(LinearBVH& bvh)
: Leafs(bvh.LeafNodes.PrepareForInput(Device()))
{
}
typedef void ControlSignature(FieldInOut<>);
typedef void ExecutionSignature(_1);
VTKM_EXEC
void operator()(vtkm::Id& hitIndex) const
{
vtkm::Id cellIndex = -1;
if (hitIndex != -1)
{
cellIndex = Leafs.Get(hitIndex)[0];
}
hitIndex = cellIndex;
}
}; //class CellIndexFilter
template <typename DynamicCoordType, typename Precision>
VTKM_CONT void run(Ray<Precision>& rays, LinearBVH& bvh, DynamicCoordType coordsHandle)
{
vtkm::worklet::DispatcherMapField<Intersector, Device>(Intersector(false, bvh))
.Invoke(rays.Dir,
rays.Origin,
rays.Distance,
rays.MinDistance,
rays.MaxDistance,
rays.U,
rays.V,
rays.HitIdx,
coordsHandle);
}
template <typename DynamicCoordType, typename Precision>
VTKM_CONT void runHitOnly(Ray<Precision>& rays,
LinearBVH& bvh,
DynamicCoordType coordsHandle,
bool returnCellIndex)
{
vtkm::worklet::DispatcherMapField<IntersectorHitIndex<Precision>, Device>(
IntersectorHitIndex<Precision>(false, bvh))
.Invoke(rays.Dir,
rays.HitIdx,
coordsHandle,
rays.Distance,
rays.MinDistance,
rays.MaxDistance,
rays.Origin);
// Normally we return the index of the triangle hit,
// but in some cases we are only interested in the cell
if (returnCellIndex)
{
vtkm::worklet::DispatcherMapField<CellIndexFilter, Device>(CellIndexFilter(bvh))
.Invoke(rays.HitIdx);
}
// Update ray status
RayOperations::UpdateRayStatus(rays, Device());
}
}; // class intersector
}
}
} //namespace vtkm::rendering::raytracing
#endif //vtk_m_rendering_raytracing_TriagnleIntersector_h
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