87 lines
3.1 KiB
C++
87 lines
3.1 KiB
C++
/*******************************************************************************
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* The MIT License (MIT)
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*
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* Copyright (c) 2015 David Williams and Matthew Williams
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*******************************************************************************/
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#include "Raycast.h"
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namespace PolyVox
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{
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namespace
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{
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/**
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* This is just an implementation class for the pickVoxel function
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*
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* It makes note of the sort of empty voxel you're looking for in the constructor.
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*
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* Each time the operator() is called:
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* * if it's hit a voxel it sets up the result and returns false
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* * otherwise it preps the result for the next iteration and returns true
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*/
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template <typename VolumeType>
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class RaycastPickingFunctor
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{
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public:
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RaycastPickingFunctor(const typename VolumeType::VoxelType& emptyVoxelExample)
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:m_emptyVoxelExample(emptyVoxelExample)
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, m_result()
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{
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}
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bool operator()(const typename VolumeType::Sampler& sampler)
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{
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if (sampler.getVoxel() != m_emptyVoxelExample) //If we've hit something
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{
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m_result.didHit = true;
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m_result.hitVoxel = sampler.getPosition();
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return false;
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}
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m_result.hasPreviousVoxel = true;
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m_result.previousVoxel = sampler.getPosition();
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return true;
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}
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const typename VolumeType::VoxelType& m_emptyVoxelExample;
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PickResult m_result;
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};
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}
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/**
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* \param volData The volume to pass the ray though
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* \param v3dStart The start position in the volume
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* \param v3dDirectionAndLength The direction and length of the ray
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* \param emptyVoxelExample The value used to represent empty voxels in your volume
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*
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* \return A PickResult containing the hit information
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*/
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template<typename VolumeType>
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PickResult pickVoxel(VolumeType* volData, const Vector3DFloat& v3dStart, const Vector3DFloat& v3dDirectionAndLength, const typename VolumeType::VoxelType& emptyVoxelExample)
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{
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RaycastPickingFunctor<VolumeType> functor(emptyVoxelExample);
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raycastWithDirection(volData, v3dStart, v3dDirectionAndLength, functor);
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return functor.m_result;
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}
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}
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