How to get motionblur infos for procedural geometry?

[haggi]

I want to create a plugin which creates geometry at rendertime. But I need motionblur information for my plugin.

It distributes objects (e.g. grass or fur) on an (invisible) base surface. To render motionblur I need some motion information about the base surface.

Basically I would save the motion vectors for the invisible base surface and reuse them in the procedural geometry plugin.

But how can I get these motion vectors? Do I have to do it myself or is there any help from vray, maybe something like a preFrameStep procedure?

[vlado]

If your plugin is designed to run at least partially in Maya, you can get the infos directly from Maya by evaluating the base object at different moments of time (i.e. with a different time context).

Best regards,
Vlado