[Sidefx-houdini-list] Vector motion blur render pass query

Sebastian H. Schmidt sebastian.h.schmidt at googlemail.com
Tue Mar 2 04:40:09 EST 2010

the vop node getBlurP (vex function getblurP) is your friend ;) take the
position at the beginning and end of a frame and calculate the velocity,
to transfer something into camera space use the toNDC, or the transform VOP


On Tue, Mar 2, 2010 at 9:23 AM, Phil Spicer <PSpicer at bournemouth.ac.uk>wrote:

> Hi,
> Is there any way output a motion velocity vector render pass for creating
> motion blur in the composite? I have tried generating one using the Trail
> SOP and re-ranging the velocity data to output as colour using the Point
> SOP, and this works; however everything is in World Space rather than
> relative to Camera Space. I am playing with VOPs as we speak...
> Any thoughts welcome...
> Kind regards,
> Phil.
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