If your brain mesh shows both hemispheres, apply a clip plane to hide one hemisphere. You can paste the code below into the 'Scripting' panel on the right side, and choose Scripting/Run to see the sample image. Typically, one can not define a perfect clip plane between the two hemisphere due to asymmetries (Yakovlevian torque)


import gl
gl.resetdefaults()
gl.meshload('mni152_2009')
gl.overlayload('motor_4t95mesh.mz3')
gl.clipazimuthelevation(0.5, 270, 0)
gl.shaderxray(1.0, 0.3)
gl.azimuthelevation(270, 15)