Dissapearing 3D Model

So…If I load an .obj file in jme3, it looks like this:







if I move the cam forward (Key W) a little bit of the model begins to dissapear:







And if I zoom in further, it’s totaly gone:







how can I make it “solid”?

It seems like the camera is going inside the object?

hm…but why is the half of the model viisible if I am in front of it?

hm…but why is the half of the model viisible if I am in front of it?

Due to the uniform grayness you might make an assumption about the model shape

My assumption is that the model is not actually flat as seen, but actually the left part of it is closer to the camera then the right part.