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import maya.cmds as cmds

def OnNewFrame(node, t, dt):
    cmds.vrend()

Rendering Phoenix together with VRayAerialPerspective, VRayEnvironmentFog or VRayVolumeGrid on V-Ray CPU

If you have volumetric effects in your scene such as an Environment Fog, an Aerial Perspective or a Volume Grid, V-Ray CPU won't be able to properly determine their positions along the camera rays. Consequently, these effects will render as if they were placed one after the other in the camera frustum.

To resolve this problem, you could switch the volumetric rendering mode to Volumetric Geometry for Fire / Smoke, and respectively for particles you could enable Render as Geometry in the PhoenixFD Phoenix FD Particle Shader. This will allow V-Ray CPU to properly blend your PhoenixFD Phoenix FD simulation with the rest of the volumetric effects in your scene. Note that in these modes you might have to increase the V-Ray Max Transparency Levels option under the Materials rollout of V-Ray's Overrides tab. 

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