mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-19 18:45:43 +00:00
523 lines
15 KiB
C++
523 lines
15 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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//
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//============================================================================
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#include <vtkm/VectorAnalysis.h>
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#include <vtkm/cont/Algorithm.h>
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#include <vtkm/rendering/raytracing/BVHTraverser.h>
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#include <vtkm/rendering/raytracing/CylinderIntersector.h>
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#include <vtkm/rendering/raytracing/RayOperations.h>
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#include <vtkm/worklet/DispatcherMapTopology.h>
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namespace vtkm
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{
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namespace rendering
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{
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namespace raytracing
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{
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namespace detail
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{
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class FindCylinderAABBs : public vtkm::worklet::WorkletMapField
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{
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public:
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VTKM_CONT
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FindCylinderAABBs() {}
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typedef void ControlSignature(FieldIn,
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FieldIn,
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FieldOut,
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FieldOut,
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FieldOut,
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FieldOut,
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FieldOut,
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FieldOut,
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WholeArrayIn);
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typedef void ExecutionSignature(_1, _2, _3, _4, _5, _6, _7, _8, _9);
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template <typename PointPortalType>
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VTKM_EXEC void operator()(const vtkm::Id3 cylId,
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const vtkm::Float32& radius,
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vtkm::Float32& xmin,
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vtkm::Float32& ymin,
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vtkm::Float32& zmin,
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vtkm::Float32& xmax,
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vtkm::Float32& ymax,
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vtkm::Float32& zmax,
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const PointPortalType& points) const
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{
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// cast to Float32
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vtkm::Vec3f_32 point1, point2;
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vtkm::Vec3f_32 temp;
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point1 = static_cast<vtkm::Vec3f_32>(points.Get(cylId[1]));
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point2 = static_cast<vtkm::Vec3f_32>(points.Get(cylId[2]));
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temp[0] = radius;
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temp[1] = 0.0f;
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temp[2] = 0.0f;
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xmin = ymin = zmin = vtkm::Infinity32();
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xmax = ymax = zmax = vtkm::NegativeInfinity32();
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//set first point to max and min
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Bounds(point1, radius, xmin, ymin, zmin, xmax, ymax, zmax);
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Bounds(point2, radius, xmin, ymin, zmin, xmax, ymax, zmax);
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}
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VTKM_EXEC void Bounds(const vtkm::Vec3f_32& point,
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const vtkm::Float32& radius,
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vtkm::Float32& xmin,
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vtkm::Float32& ymin,
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vtkm::Float32& zmin,
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vtkm::Float32& xmax,
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vtkm::Float32& ymax,
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vtkm::Float32& zmax) const
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{
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vtkm::Vec3f_32 temp, p;
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temp[0] = radius;
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temp[1] = 0.0f;
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temp[2] = 0.0f;
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p = point + temp;
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xmin = vtkm::Min(xmin, p[0]);
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xmax = vtkm::Max(xmax, p[0]);
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ymin = vtkm::Min(ymin, p[1]);
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ymax = vtkm::Max(ymax, p[1]);
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zmin = vtkm::Min(zmin, p[2]);
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zmax = vtkm::Max(zmax, p[2]);
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p = point - temp;
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xmin = vtkm::Min(xmin, p[0]);
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xmax = vtkm::Max(xmax, p[0]);
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ymin = vtkm::Min(ymin, p[1]);
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ymax = vtkm::Max(ymax, p[1]);
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zmin = vtkm::Min(zmin, p[2]);
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zmax = vtkm::Max(zmax, p[2]);
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temp[0] = 0.f;
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temp[1] = radius;
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temp[2] = 0.f;
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p = point + temp;
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xmin = vtkm::Min(xmin, p[0]);
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xmax = vtkm::Max(xmax, p[0]);
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ymin = vtkm::Min(ymin, p[1]);
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ymax = vtkm::Max(ymax, p[1]);
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zmin = vtkm::Min(zmin, p[2]);
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zmax = vtkm::Max(zmax, p[2]);
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p = point - temp;
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xmin = vtkm::Min(xmin, p[0]);
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xmax = vtkm::Max(xmax, p[0]);
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ymin = vtkm::Min(ymin, p[1]);
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ymax = vtkm::Max(ymax, p[1]);
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zmin = vtkm::Min(zmin, p[2]);
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zmax = vtkm::Max(zmax, p[2]);
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temp[0] = 0.f;
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temp[1] = 0.f;
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temp[2] = radius;
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p = point + temp;
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xmin = vtkm::Min(xmin, p[0]);
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xmax = vtkm::Max(xmax, p[0]);
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ymin = vtkm::Min(ymin, p[1]);
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ymax = vtkm::Max(ymax, p[1]);
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zmin = vtkm::Min(zmin, p[2]);
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zmax = vtkm::Max(zmax, p[2]);
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p = point - temp;
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xmin = vtkm::Min(xmin, p[0]);
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xmax = vtkm::Max(xmax, p[0]);
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ymin = vtkm::Min(ymin, p[1]);
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ymax = vtkm::Max(ymax, p[1]);
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zmin = vtkm::Min(zmin, p[2]);
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zmax = vtkm::Max(zmax, p[2]);
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}
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}; //class FindAABBs
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template <typename Device>
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class CylinderLeafIntersector
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{
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public:
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using IdHandle = vtkm::cont::ArrayHandle<vtkm::Id3>;
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using IdArrayPortal = typename IdHandle::ReadPortalType;
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using FloatHandle = vtkm::cont::ArrayHandle<vtkm::Float32>;
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using FloatPortal = typename FloatHandle::ReadPortalType;
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IdArrayPortal CylIds;
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FloatPortal Radii;
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CylinderLeafIntersector() {}
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CylinderLeafIntersector(const IdHandle& cylIds,
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const FloatHandle& radii,
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vtkm::cont::Token& token)
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: CylIds(cylIds.PrepareForInput(Device(), token))
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, Radii(radii.PrepareForInput(Device(), token))
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{
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}
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template <typename vec3>
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VTKM_EXEC vec3 cylinder(const vec3& ray_start,
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const vec3& ray_direction,
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const vec3& p,
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const vec3& q,
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float r) const
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{
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float t = 0;
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vec3 d = q - p;
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vec3 m = ray_start - p;
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vec3 s = ray_start - q;
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vtkm::Float32 mdotm = vtkm::Float32(vtkm::dot(m, m));
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vec3 n = ray_direction * (vtkm::Max(mdotm, static_cast<vtkm::Float32>(vtkm::dot(s, s))) + r);
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vtkm::Float32 mdotd = vtkm::Float32(vtkm::dot(m, d));
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vtkm::Float32 ndotd = vtkm::Float32(vtkm::dot(n, d));
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vtkm::Float32 ddotd = vtkm::Float32(vtkm::dot(d, d));
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if ((mdotd < 0.0f) && (mdotd + ndotd < 0.0f))
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{
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return vec3(0.f, 0.f, 0.f);
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}
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if ((mdotd > ddotd) && (mdotd + ndotd > ddotd))
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{
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return vec3(0.f, 0.f, 0.f);
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}
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vtkm::Float32 ndotn = vtkm::Float32(vtkm::dot(n, n));
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vtkm::Float32 nlen = vtkm::Float32(sqrt(ndotn));
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vtkm::Float32 mdotn = vtkm::Float32(vtkm::dot(m, n));
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vtkm::Float32 a = ddotd * ndotn - ndotd * ndotd;
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vtkm::Float32 k = mdotm - r * r;
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vtkm::Float32 c = ddotd * k - mdotd * mdotd;
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if (fabs(a) < 1e-6)
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{
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if (c > 0.0)
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{
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return vec3(0, 0, 0);
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}
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if (mdotd < 0.0f)
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{
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t = -mdotn / ndotn;
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}
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else if (mdotd > ddotd)
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{
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t = (ndotd - mdotn) / ndotn;
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}
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else
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t = 0;
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return vec3(1, t * nlen, 0);
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}
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vtkm::Float32 b = ddotd * mdotn - ndotd * mdotd;
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vtkm::Float32 discr = b * b - a * c;
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if (discr < 0.0f)
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{
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return vec3(0, 0, 0);
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}
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t = (-b - vtkm::Sqrt(discr)) / a;
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if (t < 0.0f || t > 1.0f)
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{
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return vec3(0, 0, 0);
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}
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vtkm::Float32 u = mdotd + t * ndotd;
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if (u > ddotd)
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{
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if (ndotd >= 0.0f)
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{
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return vec3(0, 0, 0);
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}
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t = (ddotd - mdotd) / ndotd;
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return vec3(
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k + ddotd - 2 * mdotd + t * (2 * (mdotn - ndotd) + t * ndotn) <= 0.0f, t * nlen, 0);
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}
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else if (u < 0.0f)
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{
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if (ndotd <= 0.0f)
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{
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return vec3(0.0, 0.0, 0);
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}
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t = -mdotd / ndotd;
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return vec3(k + 2 * t * (mdotn + t * ndotn) <= 0.0f, t * nlen, 0);
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}
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return vec3(1, t * nlen, 0);
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}
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template <typename PointPortalType, typename LeafPortalType, typename Precision>
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VTKM_EXEC inline void IntersectLeaf(
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const vtkm::Int32& currentNode,
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const vtkm::Vec<Precision, 3>& origin,
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const vtkm::Vec<Precision, 3>& dir,
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const PointPortalType& points,
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vtkm::Id& hitIndex,
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Precision& closestDistance, // closest distance in this set of primitives
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Precision& vtkmNotUsed(minU),
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Precision& vtkmNotUsed(minV),
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LeafPortalType leafs,
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const Precision& minDistance) const // report intesections past this distance
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{
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const vtkm::Id cylCount = leafs.Get(currentNode);
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for (vtkm::Id i = 1; i <= cylCount; ++i)
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{
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const vtkm::Id cylIndex = leafs.Get(currentNode + i);
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if (cylIndex < CylIds.GetNumberOfValues())
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{
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vtkm::Id3 pointIndex = CylIds.Get(cylIndex);
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vtkm::Float32 radius = Radii.Get(cylIndex);
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vtkm::Vec<Precision, 3> bottom, top;
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bottom = vtkm::Vec<Precision, 3>(points.Get(pointIndex[1]));
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top = vtkm::Vec<Precision, 3>(points.Get(pointIndex[2]));
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vtkm::Vec3f_32 ret;
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ret = cylinder(origin, dir, bottom, top, radius);
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if (ret[0] > 0)
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{
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if (ret[1] < closestDistance && ret[1] > minDistance)
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{
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//matid = vtkm::Vec<, 3>(points.Get(cur_offset + 2))[0];
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closestDistance = ret[1];
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hitIndex = cylIndex;
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}
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}
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}
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} // for
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}
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};
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class CylinderLeafWrapper : public vtkm::cont::ExecutionObjectBase
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{
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protected:
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using IdHandle = vtkm::cont::ArrayHandle<vtkm::Id3>;
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using FloatHandle = vtkm::cont::ArrayHandle<vtkm::Float32>;
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IdHandle CylIds;
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FloatHandle Radii;
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public:
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CylinderLeafWrapper(IdHandle& cylIds, FloatHandle radii)
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: CylIds(cylIds)
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, Radii(radii)
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{
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}
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template <typename Device>
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VTKM_CONT CylinderLeafIntersector<Device> PrepareForExecution(Device,
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vtkm::cont::Token& token) const
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{
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return CylinderLeafIntersector<Device>(this->CylIds, this->Radii, token);
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}
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};
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class CalculateNormals : public vtkm::worklet::WorkletMapField
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{
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public:
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VTKM_CONT
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CalculateNormals() {}
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typedef void
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ControlSignature(FieldIn, FieldIn, FieldOut, FieldOut, FieldOut, WholeArrayIn, WholeArrayIn);
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typedef void ExecutionSignature(_1, _2, _3, _4, _5, _6, _7);
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template <typename Precision, typename PointPortalType, typename IndicesPortalType>
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VTKM_EXEC inline void operator()(const vtkm::Id& hitIndex,
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const vtkm::Vec<Precision, 3>& intersection,
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Precision& normalX,
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Precision& normalY,
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Precision& normalZ,
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const PointPortalType& points,
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const IndicesPortalType& indicesPortal) const
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{
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if (hitIndex < 0)
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return;
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vtkm::Id3 cylId = indicesPortal.Get(hitIndex);
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vtkm::Vec<Precision, 3> a, b;
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a = points.Get(cylId[1]);
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b = points.Get(cylId[2]);
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vtkm::Vec<Precision, 3> ap, ab;
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ap = intersection - a;
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ab = b - a;
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Precision mag2 = vtkm::Magnitude(ab);
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Precision len = vtkm::dot(ab, ap);
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Precision t = len / mag2;
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vtkm::Vec<Precision, 3> center;
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center = a + t * ab;
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vtkm::Vec<Precision, 3> normal = intersection - center;
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vtkm::Normalize(normal);
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//flip the normal if its pointing the wrong way
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normalX = normal[0];
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normalY = normal[1];
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normalZ = normal[2];
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}
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}; //class CalculateNormals
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template <typename Precision>
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class GetScalar : public vtkm::worklet::WorkletMapField
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{
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private:
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Precision MinScalar;
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Precision InvDeltaScalar;
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bool Normalize;
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public:
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VTKM_CONT
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GetScalar(const vtkm::Float32& minScalar, const vtkm::Float32& maxScalar)
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: MinScalar(minScalar)
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{
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Normalize = true;
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if (minScalar >= maxScalar)
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{
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// support the scalar renderer
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Normalize = false;
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this->InvDeltaScalar = Precision(0.f);
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}
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else
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{
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//Make sure the we don't divide by zero on
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//something like an iso-surface
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this->InvDeltaScalar = 1.f / (maxScalar - this->MinScalar);
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}
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}
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typedef void ControlSignature(FieldIn, FieldInOut, WholeArrayIn, WholeArrayIn);
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typedef void ExecutionSignature(_1, _2, _3, _4);
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template <typename ScalarPortalType, typename IndicesPortalType>
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VTKM_EXEC void operator()(const vtkm::Id& hitIndex,
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Precision& scalar,
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const ScalarPortalType& scalars,
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const IndicesPortalType& indicesPortal) const
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{
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if (hitIndex < 0)
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return;
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//TODO: this should be interpolated?
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vtkm::Id3 pointId = indicesPortal.Get(hitIndex);
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scalar = Precision(scalars.Get(pointId[0]));
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if (Normalize)
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{
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scalar = (scalar - this->MinScalar) * this->InvDeltaScalar;
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}
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}
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}; //class GetScalar
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} // namespace detail
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CylinderIntersector::CylinderIntersector()
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: ShapeIntersector()
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{
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}
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CylinderIntersector::~CylinderIntersector() {}
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void CylinderIntersector::SetData(const vtkm::cont::CoordinateSystem& coords,
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vtkm::cont::ArrayHandle<vtkm::Id3> cylIds,
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vtkm::cont::ArrayHandle<vtkm::Float32> radii)
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{
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this->Radii = radii;
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this->CylIds = cylIds;
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this->CoordsHandle = coords;
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AABBs AABB;
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vtkm::worklet::DispatcherMapField<detail::FindCylinderAABBs>(detail::FindCylinderAABBs())
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.Invoke(this->CylIds,
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this->Radii,
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AABB.xmins,
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AABB.ymins,
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AABB.zmins,
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AABB.xmaxs,
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AABB.ymaxs,
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AABB.zmaxs,
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CoordsHandle);
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this->SetAABBs(AABB);
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}
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void CylinderIntersector::IntersectRays(Ray<vtkm::Float32>& rays, bool returnCellIndex)
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{
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IntersectRaysImp(rays, returnCellIndex);
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}
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void CylinderIntersector::IntersectRays(Ray<vtkm::Float64>& rays, bool returnCellIndex)
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{
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IntersectRaysImp(rays, returnCellIndex);
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}
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template <typename Precision>
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void CylinderIntersector::IntersectRaysImp(Ray<Precision>& rays, bool vtkmNotUsed(returnCellIndex))
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{
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detail::CylinderLeafWrapper leafIntersector(this->CylIds, Radii);
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BVHTraverser traverser;
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traverser.IntersectRays(rays, this->BVH, leafIntersector, this->CoordsHandle);
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RayOperations::UpdateRayStatus(rays);
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}
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template <typename Precision>
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void CylinderIntersector::IntersectionDataImp(Ray<Precision>& rays,
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const vtkm::cont::Field scalarField,
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const vtkm::Range& scalarRange)
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{
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ShapeIntersector::IntersectionPoint(rays);
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// TODO: if this is nodes of a mesh, support points
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const bool isSupportedField = scalarField.IsFieldCell() || scalarField.IsFieldPoint();
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if (!isSupportedField)
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{
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throw vtkm::cont::ErrorBadValue("Field not accociated with a cell set");
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}
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vtkm::worklet::DispatcherMapField<detail::CalculateNormals>(detail::CalculateNormals())
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.Invoke(rays.HitIdx,
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rays.Intersection,
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rays.NormalX,
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rays.NormalY,
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rays.NormalZ,
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CoordsHandle,
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CylIds);
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vtkm::worklet::DispatcherMapField<detail::GetScalar<Precision>>(
|
|
detail::GetScalar<Precision>(vtkm::Float32(scalarRange.Min), vtkm::Float32(scalarRange.Max)))
|
|
.Invoke(rays.HitIdx,
|
|
rays.Scalar,
|
|
vtkm::rendering::raytracing::GetScalarFieldArray(scalarField),
|
|
CylIds);
|
|
}
|
|
|
|
void CylinderIntersector::IntersectionData(Ray<vtkm::Float32>& rays,
|
|
const vtkm::cont::Field scalarField,
|
|
const vtkm::Range& scalarRange)
|
|
{
|
|
IntersectionDataImp(rays, scalarField, scalarRange);
|
|
}
|
|
|
|
void CylinderIntersector::IntersectionData(Ray<vtkm::Float64>& rays,
|
|
const vtkm::cont::Field scalarField,
|
|
const vtkm::Range& scalarRange)
|
|
{
|
|
IntersectionDataImp(rays, scalarField, scalarRange);
|
|
}
|
|
|
|
vtkm::Id CylinderIntersector::GetNumberOfShapes() const
|
|
{
|
|
return CylIds.GetNumberOfValues();
|
|
}
|
|
}
|
|
}
|
|
} //namespace vtkm::rendering::raytracing
|