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特性

The standard parameters of a LodObject can be obtained and changed with C4DAtom::SetParameter() / C4DAtom::GetParameter() . The parameter IDs are defined in olod.h .

// get current criteria GeData data; lodObject-> GetParameter ( LOD_CRITERIA , data, DESCFLAGS_GET::NONE ); const Int32 criteria = data. GetInt32 ();

// check if User LOD Level if (criteria == LOD_CRITERIA_MANUAL ) { // get max level const Int32 maxLevel = lodObject-> GetLevelCount () - 1; // set current level to max level lodObject-> SetParameter ( LOD_CURRENT_LEVEL , maxLevel, DESCFLAGS_SET::NONE ); }

Levels

A LodObject object handles multiple levels. The current level is used to define the geometry it should create.

• LodObject::GetLevelCount() : Returns the number of levels.
• LodObject::GetCurrentLevel() : Returns the index of the current level.

// get current level const Int32 currentLevel = lodObject-> GetCurrentLevel ();

// hide current level DescID showControlID; if (!lodObject-> GetShowControlDescID (currentLevel, showControlID)) return maxon::UnexpectedError( MAXON_SOURCE_LOCATION ); lodObject-> SetParameter (showControlID, false , DESCFLAGS_SET::NONE );

Dynamic Parameter IDs

Each level contains multiple parameters that configure that level. The DescID for these parameters can be obtained with these functions.

In every mode a level defines various display parameters:

• LodObject::GetShowControlDescID() ：返回 DescID for the display mode.
• LodObject::GetDisplayBFCDescID() ：返回 DescID for the backface culling mode.
• LodObject::GetDisplayTexDescID() ：返回 DescID for the texture mode.
• LodObject::GetDisplayEOGLDescID(): Returns the DescID for the Enhanced OpenGL mode.
• LodObject::GetDisplayStModeDescID() ：返回 DescID for the shading style.
• LodObject::GetDisplayShModeDescID() ：返回 DescID for the shading settings.

The IDs of the shading modes and styles are defined in tdisplay.h .

// enable backface culling if (!lodObject-> GetDisplayBFCDescID (level, descID)) return maxon::UnexpectedError( MAXON_SOURCE_LOCATION ); lodObject-> SetParameter (descID, true , DESCFLAGS_SET::NONE );

// use "Lines" shading if (!lodObject-> GetDisplayShModeDescID (level, descID)) return maxon::UnexpectedError( MAXON_SOURCE_LOCATION ); lodObject-> SetParameter (descID, DISPLAYTAG_SDISPLAY_NOSHADING , DESCFLAGS_SET::NONE );

// use "Wireframe" style if (!lodObject-> GetDisplayStModeDescID (level, descID)) return maxon::UnexpectedError( MAXON_SOURCE_LOCATION ); lodObject-> SetParameter (descID, DISPLAYTAG_WDISPLAY_WIREFRAME , DESCFLAGS_SET::NONE ); }

In "Manual Groups" mode a list of objects can be accessed:

• LodObject::GetManualModeObjectListDescID() ：返回 DescID of the InExclude list.

// use "Manual Groups" and a manually defined number of groups lodObject-> SetParameter ( LOD_MODE , LOD_MODE_MANUAL_GROUPS , DESCFLAGS_SET::NONE ); lodObject-> SetParameter ( LOD_CRITERIA , LOD_CRITERIA_MANUAL , DESCFLAGS_SET::NONE ); lodObject-> SetParameter ( LOD_LEVEL_COUNT_DYN , objectCount, DESCFLAGS_SET::NONE );

// add objects to groups for ( Int32 level = 0; level < objectCount; ++level) { // get object C4DAtom * const atom = objects-> GetIndex (level); BaseObject * const baseObject = static_cast< BaseObject * > (atom); if (baseObject == nullptr ) return maxon::UnexpectedError( MAXON_SOURCE_LOCATION );

// make object a child object of the LOD object baseObject-> 移除 (); doc-> InsertObject (baseObject, lodObject, nullptr );

// insert into "Objects" list of the given level DescID listID; if (!lodObject-> GetManualModeObjectListDescID (level, listID)) return maxon::UnexpectedError( MAXON_SOURCE_LOCATION );

// create InEx data 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 (baseObject, 1); // set parameter lodObject-> SetParameter (listID, data, DESCFLAGS_SET::NONE ); }

In "Simplify" mode these settings are available:

• LodObject::GetSimplifyModeDescID() ：返回 DescID of the "Simplify Mode" parameter.
• LodObject::GetDecimateStrengthDescID() ：返回 DescID of the strength parameter.
• LodObject::GetPerObjectControlDescID() ：返回 DescID of the "Per Object" option.
• LodObject::GetNullDisplayDescID() ：返回 DescID of the null display mode.
• LodObject::GetNullRadiusDescID() ：返回 DescID of the null radius parameter.
• LodObject::GetNullAspectRatioDescID() ：返回 DescID of the null aspect radius parameter.
• LodObject::GetNullOrientationDescID() ：返回 DescID of the null orientation parameter.

The null display mode setting IDs are defined in onull.h .

// use "Simplify" mode and a manual number of levels lodObject-> SetParameter ( LOD_MODE , LOD_MODE_SIMPLIFY , DESCFLAGS_SET::NONE ); lodObject-> SetParameter ( LOD_CRITERIA , LOD_CRITERIA_MANUAL , DESCFLAGS_SET::NONE ); lodObject-> SetParameter ( LOD_LEVEL_COUNT_DYN , 2, DESCFLAGS_SET::NONE ); DescID descID;

// first level

// set mode to "Convex Hull" if (!lodObject-> GetSimplifyModeDescID (0, descID)) return maxon::UnexpectedError( MAXON_SOURCE_LOCATION ); lodObject-> SetParameter (descID, LOD_SIMPLIFY_CONVEXHULL , DESCFLAGS_SET::NONE );

// set "Per Object" to true if (!lodObject-> GetPerObjectControlDescID (0, descID)) return maxon::UnexpectedError( MAXON_SOURCE_LOCATION ); lodObject-> SetParameter (descID, true , DESCFLAGS_SET::NONE );

// second level

// set mode to "Null" if (!lodObject-> GetSimplifyModeDescID (1, descID)) return maxon::UnexpectedError( MAXON_SOURCE_LOCATION ); lodObject-> SetParameter (descID, LOD_SIMPLIFY_NULL , DESCFLAGS_SET::NONE );

// set "Display" to "Circle" if (!lodObject-> GetNullDisplayDescID (1, descID)) return maxon::UnexpectedError( MAXON_SOURCE_LOCATION ); lodObject-> SetParameter (descID, NULLOBJECT_DISPLAY_CIRCLE , DESCFLAGS_SET::NONE );

Dirty Checksums

The dirty checksum of levels and the cache can be obtained with:

• LodObject::GetLevelDirty() : Returns the checksum for the level switch. Every time the level changes, the counter is increased.
• LodObject::GetCacheDirty() : Returns the checksum for the cache creation. Every time the cache is rebuilt, the counter is increased.

延伸阅读

• RangeData Manual
• BaseObject Manual
• DescID Manual