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No field colour on isoSurface

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Old   August 26, 2019, 14:44
Default No field colour on isoSurface
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I am trying to create a pciture of the free-water-surface.
First aI use:
postProcess -func writeCellCentres
to get Cz as the height-field

afterward I use the runTimePostProcessing Utility


            type            isoSurface;
            renderMode      flat; //flat gouraud phong
            representation  surface;
            field           alpha.water;
            values          ( 0.5 );
            colourField     Cz;
            colourBy        field;
            range           (-0.7 0.7);
            smooth          true;
But the free surface stays grey.
Can anyone help?

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