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use linked nodes to get an upward direction when defining orientation
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@ -518,8 +518,10 @@ bool SMDS_VolumeTool::Set (const SMDS_MeshElement* theVolume)
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// define volume orientation
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// define volume orientation
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XYZ botNormal;
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XYZ botNormal;
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GetFaceNormal( 0, botNormal.x, botNormal.y, botNormal.z );
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GetFaceNormal( 0, botNormal.x, botNormal.y, botNormal.z );
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const SMDS_MeshNode* topNode = myVolumeNodes[ myVolumeNbNodes - 1 ];
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const SMDS_MeshNode* botNode = myVolumeNodes[ 0 ];
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const SMDS_MeshNode* botNode = myVolumeNodes[ 0 ];
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int topNodeIndex = myVolume->NbCornerNodes() - 1;
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while ( !IsLinked( 0, topNodeIndex )) --topNodeIndex;
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const SMDS_MeshNode* topNode = myVolumeNodes[ topNodeIndex ];
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XYZ upDir (topNode->X() - botNode->X(),
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XYZ upDir (topNode->X() - botNode->X(),
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topNode->Y() - botNode->Y(),
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topNode->Y() - botNode->Y(),
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topNode->Z() - botNode->Z() );
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topNode->Z() - botNode->Z() );
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