In OpenPlant Isometrics Manager, to turn off Hatching lines for OpenPlant Isometrics Manager. It has been included with new release of OpenPlant Isometrics Manager & are available under node - Rolling Offset Depiction. Below are the steps to get the desired pattern.
http://communities.bentley.com/products/plant/design___engineering/w/plant_design_and_engineering__wiki/13393.settingsattributes-openplant-isometrics-manager
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