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Diffstat (limited to 'thirdparty/bullet/src/BulletCollision/Gimpact/btContactProcessing.cpp')
| -rw-r--r-- | thirdparty/bullet/src/BulletCollision/Gimpact/btContactProcessing.cpp | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/thirdparty/bullet/src/BulletCollision/Gimpact/btContactProcessing.cpp b/thirdparty/bullet/src/BulletCollision/Gimpact/btContactProcessing.cpp new file mode 100644 index 0000000000..eed31d839f --- /dev/null +++ b/thirdparty/bullet/src/BulletCollision/Gimpact/btContactProcessing.cpp @@ -0,0 +1,181 @@ + +/* +This source file is part of GIMPACT Library. + +For the latest info, see http://gimpact.sourceforge.net/ + +Copyright (c) 2007 Francisco Leon Najera. C.C. 80087371. +email: projectileman@yahoo.com + + +This software is provided 'as-is', without any express or implied warranty. +In no event will the authors be held liable for any damages arising from the use of this software. +Permission is granted to anyone to use this software for any purpose, +including commercial applications, and to alter it and redistribute it freely, +subject to the following restrictions: + +1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. +2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. +3. This notice may not be removed or altered from any source distribution. +*/ +#include "btContactProcessing.h" + +#define MAX_COINCIDENT 8 + +struct CONTACT_KEY_TOKEN +{ + unsigned int m_key; + int m_value; + CONTACT_KEY_TOKEN() + { + } + + CONTACT_KEY_TOKEN(unsigned int key,int token) + { + m_key = key; + m_value = token; + } + + CONTACT_KEY_TOKEN(const CONTACT_KEY_TOKEN& rtoken) + { + m_key = rtoken.m_key; + m_value = rtoken.m_value; + } + + inline bool operator <(const CONTACT_KEY_TOKEN& other) const + { + return (m_key < other.m_key); + } + + inline bool operator >(const CONTACT_KEY_TOKEN& other) const + { + return (m_key > other.m_key); + } + +}; + +class CONTACT_KEY_TOKEN_COMP +{ + public: + + bool operator() ( const CONTACT_KEY_TOKEN& a, const CONTACT_KEY_TOKEN& b ) const + { + return ( a < b ); + } +}; + + +void btContactArray::merge_contacts( + const btContactArray & contacts, bool normal_contact_average) +{ + clear(); + + int i; + if(contacts.size()==0) return; + + + if(contacts.size()==1) + { + push_back(contacts[0]); + return; + } + + btAlignedObjectArray<CONTACT_KEY_TOKEN> keycontacts; + + keycontacts.reserve(contacts.size()); + + //fill key contacts + + for ( i = 0;i<contacts.size() ;i++ ) + { + keycontacts.push_back(CONTACT_KEY_TOKEN(contacts[i].calc_key_contact(),i)); + } + + //sort keys + keycontacts.quickSort(CONTACT_KEY_TOKEN_COMP()); + + // Merge contacts + int coincident_count=0; + btVector3 coincident_normals[MAX_COINCIDENT]; + + unsigned int last_key = keycontacts[0].m_key; + unsigned int key = 0; + + push_back(contacts[keycontacts[0].m_value]); + + GIM_CONTACT * pcontact = &(*this)[0]; + + for( i=1;i<keycontacts.size();i++) + { + key = keycontacts[i].m_key; + const GIM_CONTACT * scontact = &contacts[keycontacts[i].m_value]; + + if(last_key == key)//same points + { + //merge contact + if(pcontact->m_depth - CONTACT_DIFF_EPSILON > scontact->m_depth)//) + { + *pcontact = *scontact; + coincident_count = 0; + } + else if(normal_contact_average) + { + if(btFabs(pcontact->m_depth - scontact->m_depth)<CONTACT_DIFF_EPSILON) + { + if(coincident_count<MAX_COINCIDENT) + { + coincident_normals[coincident_count] = scontact->m_normal; + coincident_count++; + } + } + } + } + else + {//add new contact + + if(normal_contact_average && coincident_count>0) + { + pcontact->interpolate_normals(coincident_normals,coincident_count); + coincident_count = 0; + } + + push_back(*scontact); + pcontact = &(*this)[this->size()-1]; + } + last_key = key; + } +} + +void btContactArray::merge_contacts_unique(const btContactArray & contacts) +{ + clear(); + + if(contacts.size()==0) return; + + if(contacts.size()==1) + { + push_back(contacts[0]); + return; + } + + GIM_CONTACT average_contact = contacts[0]; + + for (int i=1;i<contacts.size() ;i++ ) + { + average_contact.m_point += contacts[i].m_point; + average_contact.m_normal += contacts[i].m_normal * contacts[i].m_depth; + } + + //divide + btScalar divide_average = 1.0f/((btScalar)contacts.size()); + + average_contact.m_point *= divide_average; + + average_contact.m_normal *= divide_average; + + average_contact.m_depth = average_contact.m_normal.length(); + + average_contact.m_normal /= average_contact.m_depth; + +} + |