vray hair is not adhering to displaced surface

[ALFRED_ST_MEDIA]

mental ray for Maya 2013
mental ray: version 3.10.1.4, Jan 31 2012, revision 165283
Windows 7 64bit

How can I get hair to follow a displaced surface? Example, take a plane, apply a displacement map to it and grow some vray hair grass. the hair grows from the location of the flat plane, not the displaced plane.

Is there a way to force vray to calculate displacement before calculating the hair?

-ctj

[joconnell]

Likely you'll have to make a dummy, invisible surface with some pre applied displacement using whatever internal tools maya has so you get a better placement.

[vlado]

joconnell is right; there is no other way to go for the moment. You can use Maya's ability to turn displacement to polygons.

Best regards,
Vlado

[FSGFX]

yes that would be great to have the displacement calculated before the hair...

[vlado]

There would have to be a separate displacement slot in the hair object; since the displacement is computed at render time, it's not available from the base geometry when the fur needs it.

Best regards,
Vlado

[ALFRED_ST_MEDIA]

oh Vlad....next you're going to tell me there's no Santa Claus! I thought the great Oz could make all our troubles go away.

;^)

pre-displaced geo it is then, but that means the geo's going to get pretty heavy.

[ALFRED_ST_MEDIA]

Joconnell,

Thank you. I was exploring that route myself, but still hoping that I was just missing something.

Cheers.

[paulDryzen]

You can do the displacement stuff with this plugin: http://www.hajimenakamura.com/hajime...isplaceD.shtml

Paul

[vlado]

Or you could go to Modify > Convert > Displacement to Polygons...

Best regards,
Vlado