MStatus TestDeformer::deform(MDataBlock& data, MItGeometry& iter, const MMatrix& localToWorldMatrix, unsigned int mIndex) { MStatus status; // get the current node state short initialized_mapping = data.inputValue( initialized_data, &status).asShort(); CHECK_MSTATUS(status); __debug("%s(), initialized_mapping=%d, mIndex=%d", __FUNCTION__, initialized_mapping, mIndex); if( initialized_mapping == 1 ) { initVertMapping(data, iter, localToWorldMatrix, mIndex); // set initialized_data to 2 automatically. User don't have to set it manully. MObject tObj = thisMObject(); MPlug setInitMode = MPlug( tObj, initialized_data ); setInitMode.setShort( 2 ); // and sync initialized_mapping from initialized_data // so, the code section: // if (initialized_mapping == 2) // { // ... // } // will be executed when this deform() function is called next time. initialized_mapping = data.inputValue( initialized_data, &status ).asShort(); CHECK_MSTATUS(status); } if( initialized_mapping == 2 ) { envelope = MPxDeformerNode::envelope; MDataHandle envelopeHandle = data.inputValue( envelope, &status ); CHECK_MSTATUS( status ); MArrayDataHandle vertMapArrayData = data.inputArrayValue( vert_map, &status ); CHECK_MSTATUS( status ); MArrayDataHandle meshAttrHandle = data.inputArrayValue( driver_mesh, &status ); CHECK_MSTATUS( status ); /// 1. init tempOutputPts to zero points MPointArray tempOutputPts; iter.reset(); while( !iter.isDone(&status) ) { CHECK_MSTATUS(tempOutputPts.append(MPoint(0, 0, 0))); CHECK_MSTATUS(iter.next()); } assert(tempOutputPts.length() == iter.count()); /// 2. set tempOutputPts to deform values which comes from each driver mesh iter.reset(); int numMeshes = meshAttrHandle.elementCount(); __debug("%s(), numMeshes=%d", __FUNCTION__, numMeshes); CHECK_MSTATUS(meshAttrHandle.jumpToElement(0)); // for each driver mesh for( int count=0; count < numMeshes; ++count ) { __debug("%s(), count=%d", __FUNCTION__, count); // for one driver mesh: currentMesh MDataHandle currentMesh = meshAttrHandle.inputValue(&status); CHECK_MSTATUS( status ); MObject meshMobj = currentMesh.asMesh(); __debugMeshInfo(__FUNCTION__, meshMobj); // accumulate deform values of currentMesh to tempOutputPts _deform_on_one_mesh(data, iter, localToWorldMatrix, mIndex, meshMobj, envelopeHandle, vertMapArrayData, tempOutputPts ); if( !meshAttrHandle.next() ) { break; } }// for each driver mesh /// 3. add deform value to this geometry(driven mesh) int i = 0; iter.reset(); while( !iter.isDone(&status) ) { MPoint p = iter.position(MSpace::kObject, &status); CHECK_MSTATUS(status); // add the deform value to this vertex CHECK_MSTATUS(iter.setPosition( p + tempOutputPts[i]/numMeshes )); CHECK_MSTATUS(iter.next()); ++i; } assert(tempOutputPts.length() == iter.count()); }// if return( MS::kSuccess ); }