Part of model is not rendering by jme [solved]

in blender:

and in jmoneky builder:

and in jme game I used this code to render correctly but it shows the broken parts black not green.

((Node) ((Node) model).getChild("body")).getChildren().forEach((sp) -> {

            Geometry g = (Geometry) sp;

how can I solve it?

your normals are backwards in blender, recalculate normals or flip the ones that are not appearing correctly.

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how to do it? in blender?

Edit mode: Mesh->Normals->Recalculate Outside

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Next time, please post with the jmonkeybuilder tag.