C Stencil shadows can be blurred for creating smooth shadows. For this you could use a postprocessing stage as shown under render_target; however it's easier to assign a blur effect to mat_shadow.effect. The latter has also the advantage to allow non-self-shadows, which would not be possible in a postprocessing stage. Calling stencil_blur(1) activates the predefined poisson blur shader (see also render_stencil).