3D Grass does not appear in the preview.

Hello, when I have applied 3D grass to the groundm aterial, this appears just as a flat map. No 3D in the preview is shown. I am using ArchiCAD 29 and the direct link. I have removed the map from the material in archicad, but still the same. Also the grass is rendered in spots only.

Please to advice how to solve this issue. Thank you.