粒子
The basic particle system provides a simple particle generator and basic effectors. The API is defined in c4d_particleobject.h .
Particle modifiers are based on ObjectData and must implement ObjectData::ModifyParticles() . Within such a modifier changes are done through the BaseParticle structure.
// This example creates a particle emitter, a Field Force object and a linear field. // The linear field is referenced in the Field Force object; the Field Force object // is referenced in the particle emitter.// make emitter
// make field force BaseObject * const fieldForce = BaseObject::Alloc ( Ofieldforce ); if (fieldForce == nullptr ) return maxon::OutOfMemoryError( MAXON_SOURCE_LOCATION ); doc-> InsertObject (fieldForce, nullptr , nullptr );
// make field BaseObject * const linearField = BaseObject::Alloc ( Flinear ); if (linearField == nullptr ) return maxon::OutOfMemoryError( MAXON_SOURCE_LOCATION ); doc-> InsertObject (linearField, fieldForce, nullptr );
// link field force in emitter MAXON_SCOPE { emitter-> SetParameter ( PARTICLEOBJECT_MODE , PARTICLEOBJECT_MODE_INCLUDE , DESCFLAGS_SET::NONE ); GeData data( CUSTOMDATATYPE_INEXCLUDE_LIST , DEFAULTVALUE ); CustomDataType * const customData = data. GetCustomDataType ( CUSTOMDATATYPE_INEXCLUDE_LIST ); InExcludeData * const inExData = static_cast< InExcludeData * > (customData); if (inExData == nullptr ) return maxon::UnexpectedError( MAXON_SOURCE_LOCATION );
// insert object into list inExData-> InsertObject (fieldForce, 1); // set parameter particleEmitter-> SetParameter ( PARTICLEOBJECT_INCLUDE , data, DESCFLAGS_SET::NONE ); }
// make layer in Field force MAXON_SCOPE { const DescID fieldsID { ID_FIELDFORCE_FIELDLIST }; GeData effectorData; if (fieldForce-> GetParameter (fieldsID, effectorData, DESCFLAGS_GET::NONE ) == false ) return maxon::UnexpectedError( MAXON_SOURCE_LOCATION ); CustomDataType * const customData = effectorData. GetCustomDataType ( CUSTOMDATATYPE_FIELDLIST ); FieldList * const fieldList = static_cast< FieldList * > (customData); if (fieldList == nullptr ) return maxon::UnexpectedError( MAXON_SOURCE_LOCATION );
// use field layer FieldLayer * const layer = FieldLayer::Alloc ( FLfield ); if (layer == nullptr ) return maxon::OutOfMemoryError( MAXON_SOURCE_LOCATION ); layer-> SetLinkedObject (linearField);
// enable layer and set direction layer-> SetChannelFlag ( FIELDLAYER_CHANNELFLAG::ENABLE , true ); layer-> SetChannelFlag ( FIELDLAYER_CHANNELFLAG::DIRECTION , true );
// insert fieldList-> InsertLayer (layer, nullptr , nullptr ) iferr_return ;
// set data fieldForce-> SetParameter (fieldsID, effectorData, DESCFLAGS_SET::NONE );
// set strength fieldForce-> SetParameter ( ID_FIELDFORCE_STRENGTH , 20.0, DESCFLAGS_SET::NONE ); }
