85 lines
2.8 KiB
C++
85 lines
2.8 KiB
C++
/*******************************************************************************
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Copyright (c) 2013 Matt Williams
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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*******************************************************************************/
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#include "PolyVox/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.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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