To blur the environment or your mental
ray material, you can add the mia_envblur to
your shading network as follows:
Apply the
mia_material or
any other reflective mental ray shader to the object that you wish
to blur. The
mia_envblur shader
should be used in conjunction with the reflective mental ray shaders.
To add the
mia_envblur to
your scene, in the mia_materialSG node, map the
mia_envblur shader
to the Environment Shader attribute
under the Custom Shaders section under mental
ray.
Tweak the settings in the
mia_envblurAttribute
Editor to obtain the desired look.