public boolean isAccessible(Case caseP){
		return (this instanceof RobotRoues && (caseP.getNature() == NatureTerrain.TERRAIN_LIBRE || caseP.getNature() == NatureTerrain.HABITAT))
						|| (this instanceof RobotChenilles && (caseP.getNature() != NatureTerrain.EAU) && (caseP.getNature() != NatureTerrain.ROCHE))
						|| (this instanceof RobotPattes && (caseP.getNature() != NatureTerrain.EAU))
						|| (this instanceof RobotVolant);
	}