mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-07-30 18:50:59 +00:00
579 lines
18 KiB
C++
579 lines
18 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/QuadIntersector.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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#define QUAD_AABB_EPSILON 1.0e-4f
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class FindQuadAABBs : public vtkm::worklet::WorkletMapField
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{
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public:
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VTKM_CONT
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FindQuadAABBs() {}
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typedef void ControlSignature(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);
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template <typename PointPortalType>
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VTKM_EXEC void operator()(const vtkm::Vec<vtkm::Id, 5> quadId,
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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 q, r, s, t;
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q = static_cast<vtkm::Vec3f_32>(points.Get(quadId[1]));
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r = static_cast<vtkm::Vec3f_32>(points.Get(quadId[2]));
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s = static_cast<vtkm::Vec3f_32>(points.Get(quadId[3]));
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t = static_cast<vtkm::Vec3f_32>(points.Get(quadId[4]));
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xmin = q[0];
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ymin = q[1];
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zmin = q[2];
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xmax = xmin;
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ymax = ymin;
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zmax = zmin;
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xmin = vtkm::Min(xmin, r[0]);
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ymin = vtkm::Min(ymin, r[1]);
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zmin = vtkm::Min(zmin, r[2]);
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xmax = vtkm::Max(xmax, r[0]);
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ymax = vtkm::Max(ymax, r[1]);
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zmax = vtkm::Max(zmax, r[2]);
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xmin = vtkm::Min(xmin, s[0]);
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ymin = vtkm::Min(ymin, s[1]);
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zmin = vtkm::Min(zmin, s[2]);
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xmax = vtkm::Max(xmax, s[0]);
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ymax = vtkm::Max(ymax, s[1]);
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zmax = vtkm::Max(zmax, s[2]);
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xmin = vtkm::Min(xmin, t[0]);
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ymin = vtkm::Min(ymin, t[1]);
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zmin = vtkm::Min(zmin, t[2]);
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xmax = vtkm::Max(xmax, t[0]);
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ymax = vtkm::Max(ymax, t[1]);
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zmax = vtkm::Max(zmax, t[2]);
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vtkm::Float32 xEpsilon, yEpsilon, zEpsilon;
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const vtkm::Float32 minEpsilon = 1e-6f;
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xEpsilon = vtkm::Max(minEpsilon, QUAD_AABB_EPSILON * (xmax - xmin));
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yEpsilon = vtkm::Max(minEpsilon, QUAD_AABB_EPSILON * (ymax - ymin));
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zEpsilon = vtkm::Max(minEpsilon, QUAD_AABB_EPSILON * (zmax - zmin));
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xmin -= xEpsilon;
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ymin -= yEpsilon;
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zmin -= zEpsilon;
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xmax += xEpsilon;
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ymax += yEpsilon;
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zmax += zEpsilon;
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}
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}; //class FindAABBs
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template <typename Device>
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class QuadLeafIntersector
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{
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public:
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using IdType = vtkm::Vec<vtkm::Id, 5>;
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using IdHandle = vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Id, 5>>;
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using IdArrayPortal = typename IdHandle::ReadPortalType;
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IdArrayPortal QuadIds;
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QuadLeafIntersector() {}
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QuadLeafIntersector(const IdHandle& quadIds, vtkm::cont::Token& token)
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: QuadIds(quadIds.PrepareForInput(Device(), token))
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{
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}
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template <typename vec3, typename Precision>
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VTKM_EXEC bool quad(const vec3& ray_origin,
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const vec3& ray_direction,
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const vec3& v00,
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const vec3& v10,
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const vec3& v11,
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const vec3& v01,
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Precision& u,
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Precision& v,
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Precision& t) const
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{
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/* An Efficient Ray-Quadrilateral Intersection Test
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Ares Lagae Philip Dutr´e
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http://graphics.cs.kuleuven.be/publications/LD05ERQIT/index.html
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v01 *------------ * v11
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|\ |
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| \ |
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| \ |
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| \ |
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| \ |
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| \ |
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v00 *------------* v10
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*/
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// Rejects rays that are parallel to Q, and rays that intersect the plane of
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// Q either on the left of the line V00V01 or on the right of the line V00V10.
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vec3 E03 = v01 - v00;
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vec3 P = vtkm::Cross(ray_direction, E03);
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vec3 E01 = v10 - v00;
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Precision det = vtkm::dot(E01, P);
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if (vtkm::Abs(det) < vtkm::Epsilon<Precision>())
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return false;
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Precision inv_det = 1.0f / det;
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vec3 T = ray_origin - v00;
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Precision alpha = vtkm::dot(T, P) * inv_det;
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if (alpha < 0.0)
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return false;
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vec3 Q = vtkm::Cross(T, E01);
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Precision beta = vtkm::dot(ray_direction, Q) * inv_det;
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if (beta < 0.0)
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return false;
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if ((alpha + beta) > 1.0f)
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{
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// Rejects rays that intersect the plane of Q either on the
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// left of the line V11V10 or on the right of the line V11V01.
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vec3 E23 = v01 - v11;
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vec3 E21 = v10 - v11;
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vec3 P_prime = vtkm::Cross(ray_direction, E21);
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Precision det_prime = vtkm::dot(E23, P_prime);
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if (vtkm::Abs(det_prime) < vtkm::Epsilon<Precision>())
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return false;
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Precision inv_det_prime = 1.0f / det_prime;
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vec3 T_prime = ray_origin - v11;
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Precision alpha_prime = vtkm::dot(T_prime, P_prime) * inv_det_prime;
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if (alpha_prime < 0.0f)
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return false;
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vec3 Q_prime = vtkm::Cross(T_prime, E23);
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Precision beta_prime = vtkm::dot(ray_direction, Q_prime) * inv_det_prime;
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if (beta_prime < 0.0f)
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return false;
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}
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// Compute the ray parameter of the intersection point, and
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// reject the ray if it does not hit Q.
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t = vtkm::dot(E03, Q) * inv_det;
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if (t < 0.0)
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return false;
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// Compute the barycentric coordinates of V11
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Precision alpha_11, beta_11;
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vec3 E02 = v11 - v00;
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vec3 n = vtkm::Cross(E01, E02);
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if ((vtkm::Abs(n[0]) >= vtkm::Abs(n[1])) && (vtkm::Abs(n[0]) >= vtkm::Abs(n[2])))
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{
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alpha_11 = ((E02[1] * E03[2]) - (E02[2] * E03[1])) / n[0];
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beta_11 = ((E01[1] * E02[2]) - (E01[2] * E02[1])) / n[0];
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}
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else if ((vtkm::Abs(n[1]) >= vtkm::Abs(n[0])) && (vtkm::Abs(n[1]) >= vtkm::Abs(n[2])))
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{
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alpha_11 = ((E02[2] * E03[0]) - (E02[0] * E03[2])) / n[1];
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beta_11 = ((E01[2] * E02[0]) - (E01[0] * E02[2])) / n[1];
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}
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else
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{
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alpha_11 = ((E02[0] * E03[1]) - (E02[1] * E03[0])) / n[2];
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beta_11 = ((E01[0] * E02[1]) - (E01[1] * E02[0])) / n[2];
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}
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// Compute the bilinear coordinates of the intersection point.
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if (vtkm::Abs(alpha_11 - 1.0f) < vtkm::Epsilon<Precision>())
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{
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u = alpha;
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if (vtkm::Abs(beta_11 - 1.0f) < vtkm::Epsilon<Precision>())
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v = beta;
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else
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v = beta / ((u * (beta_11 - 1.0f)) + 1.0f);
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}
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else if (vtkm::Abs(beta_11 - 1.0) < vtkm::Epsilon<Precision>())
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{
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v = beta;
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u = alpha / ((v * (alpha_11 - 1.0f)) + 1.0f);
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}
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else
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{
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Precision A = 1.0f - beta_11;
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Precision B = (alpha * (beta_11 - 1.0f)) - (beta * (alpha_11 - 1.0f)) - 1.0f;
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Precision C = alpha;
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Precision D = (B * B) - (4.0f * A * C);
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Precision QQ = -0.5f * (B + ((B < 0.0f ? -1.0f : 1.0f) * vtkm::Sqrt(D)));
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u = QQ / A;
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if ((u < 0.0f) || (u > 1.0f))
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u = C / QQ;
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v = beta / ((u * (beta_11 - 1.0f)) + 1.0f);
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}
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return true;
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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& minU,
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Precision& 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 quadCount = leafs.Get(currentNode);
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for (vtkm::Id i = 1; i <= quadCount; ++i)
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{
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const vtkm::Id quadIndex = leafs.Get(currentNode + i);
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if (quadIndex < QuadIds.GetNumberOfValues())
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{
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IdType pointIndex = QuadIds.Get(quadIndex);
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Precision dist;
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vtkm::Vec<Precision, 3> q, r, s, t;
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q = vtkm::Vec<Precision, 3>(points.Get(pointIndex[1]));
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r = vtkm::Vec<Precision, 3>(points.Get(pointIndex[2]));
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s = vtkm::Vec<Precision, 3>(points.Get(pointIndex[3]));
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t = vtkm::Vec<Precision, 3>(points.Get(pointIndex[4]));
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Precision u, v;
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bool ret = quad(origin, dir, q, r, s, t, u, v, dist);
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if (ret)
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{
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if (dist < closestDistance && dist > minDistance)
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{
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//matid = vtkm::Vec<, 3>(points.Get(cur_offset + 2))[0];
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closestDistance = dist;
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hitIndex = quadIndex;
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minU = u;
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minV = v;
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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 QuadExecWrapper : public vtkm::cont::ExecutionObjectBase
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{
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protected:
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using IdType = vtkm::Vec<vtkm::Id, 5>;
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using IdHandle = vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Id, 5>>;
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IdHandle QuadIds;
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public:
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QuadExecWrapper(IdHandle& quadIds)
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: QuadIds(quadIds)
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{
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}
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template <typename Device>
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VTKM_CONT QuadLeafIntersector<Device> PrepareForExecution(Device, vtkm::cont::Token& token) const
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{
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return QuadLeafIntersector<Device>(QuadIds, 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>& rayDir,
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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::Vec<vtkm::Id, 5> quadId = indicesPortal.Get(hitIndex);
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vtkm::Vec<Precision, 3> a, b, c;
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a = points.Get(quadId[1]);
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b = points.Get(quadId[2]);
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c = points.Get(quadId[3]);
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vtkm::Vec<Precision, 3> normal = vtkm::TriangleNormal(a, b, c);
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vtkm::Normalize(normal);
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//flip the normal if its pointing the wrong way
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if (vtkm::dot(normal, rayDir) > 0.f)
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normal = -normal;
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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 GetLerpedScalar : 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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using ControlSignature = void(FieldIn, FieldIn, FieldIn, FieldOut, WholeArrayIn, WholeArrayIn);
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using ExecutionSignature = void(_1, _2, _3, _4, _5, _6);
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VTKM_CONT
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GetLerpedScalar(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 - MinScalar);
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}
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}
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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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const Precision& u,
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const Precision& v,
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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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vtkm::Vec<vtkm::Id, 5> pointId = indicesPortal.Get(hitIndex);
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Precision aScalar = Precision(scalars.Get(pointId[1]));
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Precision bScalar = Precision(scalars.Get(pointId[2]));
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Precision cScalar = Precision(scalars.Get(pointId[3]));
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Precision dScalar = Precision(scalars.Get(pointId[4]));
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Precision uP = 1.0f - u;
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Precision vP = 1.0f - v;
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scalar = uP * vP * aScalar + u * vP * bScalar + u * v * cScalar + uP * v * dScalar;
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if (Normalize)
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{
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scalar = (scalar - MinScalar) * this->InvDeltaScalar;
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}
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}
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}; //class GetLerpedScalar
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template <typename Precision>
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class GetNodalScalar : 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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using ControlSignature = void(FieldIn, FieldOut, WholeArrayIn, WholeArrayIn);
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using ExecutionSignature = void(_1, _2, _3, _4);
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VTKM_CONT
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GetNodalScalar(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 - MinScalar);
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}
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}
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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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vtkm::Vec<vtkm::Id, 5> 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 - MinScalar) * this->InvDeltaScalar;
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}
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}
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}; //class GetNodalScalar
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} // namespace detail
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QuadIntersector::QuadIntersector()
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: ShapeIntersector()
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{
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}
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QuadIntersector::~QuadIntersector() {}
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|
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void QuadIntersector::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 QuadIntersector::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>
|
||
void QuadIntersector::IntersectRaysImp(Ray<Precision>& rays, bool vtkmNotUsed(returnCellIndex))
|
||
{
|
||
|
||
detail::QuadExecWrapper leafIntersector(this->QuadIds);
|
||
|
||
BVHTraverser traverser;
|
||
traverser.IntersectRays(rays, this->BVH, leafIntersector, this->CoordsHandle);
|
||
|
||
RayOperations::UpdateRayStatus(rays);
|
||
}
|
||
|
||
template <typename Precision>
|
||
void QuadIntersector::IntersectionDataImp(Ray<Precision>& rays,
|
||
const vtkm::cont::Field scalarField,
|
||
const vtkm::Range& scalarRange)
|
||
{
|
||
ShapeIntersector::IntersectionPoint(rays);
|
||
|
||
// TODO: if this is nodes of a mesh, support points
|
||
const bool isSupportedField = scalarField.IsCellField() || scalarField.IsPointField();
|
||
if (!isSupportedField)
|
||
{
|
||
throw vtkm::cont::ErrorBadValue("Field not accociated with a cell set");
|
||
}
|
||
|
||
vtkm::worklet::DispatcherMapField<detail::CalculateNormals>(detail::CalculateNormals())
|
||
.Invoke(rays.HitIdx, rays.Dir, rays.NormalX, rays.NormalY, rays.NormalZ, CoordsHandle, QuadIds);
|
||
|
||
if (scalarField.IsPointField())
|
||
{
|
||
vtkm::worklet::DispatcherMapField<detail::GetLerpedScalar<Precision>>(
|
||
detail::GetLerpedScalar<Precision>(vtkm::Float32(scalarRange.Min),
|
||
vtkm::Float32(scalarRange.Max)))
|
||
.Invoke(rays.HitIdx,
|
||
rays.U,
|
||
rays.V,
|
||
rays.Scalar,
|
||
vtkm::rendering::raytracing::GetScalarFieldArray(scalarField),
|
||
QuadIds);
|
||
}
|
||
else
|
||
{
|
||
vtkm::worklet::DispatcherMapField<detail::GetNodalScalar<Precision>>(
|
||
detail::GetNodalScalar<Precision>(vtkm::Float32(scalarRange.Min),
|
||
vtkm::Float32(scalarRange.Max)))
|
||
.Invoke(rays.HitIdx,
|
||
rays.Scalar,
|
||
vtkm::rendering::raytracing::GetScalarFieldArray(scalarField),
|
||
QuadIds);
|
||
}
|
||
}
|
||
|
||
void QuadIntersector::IntersectionData(Ray<vtkm::Float32>& rays,
|
||
const vtkm::cont::Field scalarField,
|
||
const vtkm::Range& scalarRange)
|
||
{
|
||
IntersectionDataImp(rays, scalarField, scalarRange);
|
||
}
|
||
|
||
void QuadIntersector::IntersectionData(Ray<vtkm::Float64>& rays,
|
||
const vtkm::cont::Field scalarField,
|
||
const vtkm::Range& scalarRange)
|
||
{
|
||
IntersectionDataImp(rays, scalarField, scalarRange);
|
||
}
|
||
|
||
void QuadIntersector::SetData(const vtkm::cont::CoordinateSystem& coords,
|
||
vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Id, 5>> quadIds)
|
||
{
|
||
|
||
this->QuadIds = quadIds;
|
||
this->CoordsHandle = coords;
|
||
AABBs AABB;
|
||
|
||
vtkm::worklet::DispatcherMapField<detail::FindQuadAABBs> faabbsInvoker;
|
||
faabbsInvoker.Invoke(this->QuadIds,
|
||
AABB.xmins,
|
||
AABB.ymins,
|
||
AABB.zmins,
|
||
AABB.xmaxs,
|
||
AABB.ymaxs,
|
||
AABB.zmaxs,
|
||
CoordsHandle);
|
||
|
||
this->SetAABBs(AABB);
|
||
}
|
||
|
||
vtkm::Id QuadIntersector::GetNumberOfShapes() const
|
||
{
|
||
return QuadIds.GetNumberOfValues();
|
||
}
|
||
}
|
||
}
|
||
} //namespace vtkm::rendering::raytracing
|