93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
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//============================================================================
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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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// 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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// Copyright 2014 Sandia Corporation.
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// Copyright 2014 UT-Battelle, LLC.
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// Copyright 2014 Los Alamos National Security.
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//============================================================================
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#ifndef vtk_m_worklet_PointElevation_h
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#define vtk_m_worklet_PointElevation_h
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#include <vtkm/worklet/WorkletMapField.h>
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namespace vtkm {
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namespace worklet {
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namespace internal {
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template <typename T>
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VTKM_EXEC_EXPORT
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T clamp(const T& val, const T& min, const T& max)
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{
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return (val < min) ? min : ((val > max) ? max : val);
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}
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}
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class PointElevation : public vtkm::worklet::WorkletMapField
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{
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public:
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typedef void ControlSignature(FieldIn<Scalar>, FieldIn<Scalar>, FieldIn<Scalar>,
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FieldOut<Scalar>);
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typedef void ExecutionSignature(_1, _2, _3, _4);
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VTKM_CONT_EXPORT
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PointElevation() : LowPoint(0.0, 0.0, 0.0), HighPoint(0.0, 0.0, 1.0),
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RangeLow(0.0), RangeHigh(1.0) {}
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VTKM_CONT_EXPORT
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void SetLowPoint(const vtkm::Vec<vtkm::Float64, 3> &point)
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{
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this->LowPoint = point;
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}
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VTKM_CONT_EXPORT
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void SetHighPoint(const vtkm::Vec<vtkm::Float64, 3> &point)
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{
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this->HighPoint = point;
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}
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VTKM_CONT_EXPORT
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void SetRange(vtkm::Float64 low, vtkm::Float64 high)
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{
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this->RangeLow = low;
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this->RangeHigh = high;
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}
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template <typename T1, typename T2, typename T3, typename T4>
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VTKM_EXEC_EXPORT
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void operator()(const T1 &x, const T2 &y, const T3 &z, T4 &elevation) const
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{
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vtkm::Vec<vtkm::Float64, 3> direction = this->HighPoint - this->LowPoint;
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vtkm::Float64 length = vtkm::dot(direction, direction);
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vtkm::Float64 rangeLength = this->RangeHigh - this->RangeLow;
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vtkm::Vec<vtkm::Float64, 3> vec = vtkm::make_Vec<vtkm::Float64>(x, y, z) -
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this->LowPoint;
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vtkm::Float64 s = vtkm::dot(vec, direction) / length;
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s = internal::clamp(s, 0.0, 1.0);
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elevation = static_cast<T4>(this->RangeLow + (s * rangeLength));
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}
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private:
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vtkm::Vec<vtkm::Float64, 3> LowPoint, HighPoint;
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vtkm::Float64 RangeLow, RangeHigh;
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};
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}
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} // namespace vtkm::worklet
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#endif // vtk_m_worklet_PointElevation_h
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