How can I create a Camera+Object Velocity Shader ?

[wandersonp]

hey guys I have a scene with just camera movement following a car on the street, the building in the background is moving fast, and I want create a velocity pass for that

 

I saw the thread from SESI how to create a shader for the moving objects

http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=15521&sid=4dfeb5af02890aa795fa9cdfac9660a3

 

I understand the arrows shader, for object movement only

 

how can I apply this to camera movement and subtract or add this value from the P moving objects?

 

Im planning use the vectorBlur native node from Nuke to compose that image

 

Thanks

 

 

[Guest tar]

A *tricky* solution would be to export the geo to Nuke and render through the scanline node - you can output motion vectors there.

[wandersonp]

I did a test I got some similar result from mantra motion blur 

 

but the columns shadows still not perfectly

 

 

camera_velocity.rar