sp3 vector displacement

[MasterBercon]

vlado, yeah if you model it by hand. However if you'd want to use VRayFur for example to make the grass and try to bake it into vector displacement its not that easy.

Here is an image explaining the idea of the Vector Displacement.

http://www.niksula.cs.hut.fi/~jylila...splacement.jpg

RGB colors in Vector Displacement map tell the XYZ coordinates of that point inside the cube.

Its totally different from Normal map which tells the direction of the surface. If you put it into vector displacement nothing sensible comes out.

[gagui]

How can i do if i want to bake the vector displacement map of a teapot and apply to a sphere and get a sphere with a lot of teapots over its surface?

[beestee]

http://www.spot3d.com/vray/help/150S...cement.htm#ex8

EDIT: Wow! I was a little late to the party!

EDIT2: Are VDMs(Vector Displacement Maps) usually in a floating point format or is this something that chaos group is pioneering? It makes perfect sense.

[MasterBercon]

To put it simply, you can't.

Its technically possible but there is no practical way of doing it.

I guess you could sculpt the teapot out of planar surface, in that case it would work and you could generate the vector displacement map from it. But you can't get it out of the teapot primitive, no matter what you do.

[giraffe]

Vlado thanks for reply.
I am starting to understand.

Just one question:
you explained to model grass out of plane with edit mesh.
is there a possible way to obtain from things I already modeled? (maybe by attaching all grass strands and a plane would work? )

or maybe in better words to ask:
which technique or method can I use to produce a good displacement from grass models I made ?

[MasterBercon]

Vector Displacement is basicly only usefull when you are sculpting something and for this its perfect. You can take your mesh into scultping app, sculpt it in any possible way can think of and then render out Vector displacement map out if it. The result from Low Poly Cage + Vector Displacement map should be IDENTICAL to the High Poly Scuplted Model. I don't know if zbrush and mudbox support proper vector displacement map generation but when they do this should be possible and it you should get it with a single press of the button.

The second case where its usefull is when you are programming some effects like sea surface.

[gagui]

Then the funcionality of this vector displacement is very limited.

I think we could do vector displacement like in modo...

The displacement in that application seems very easy and useful.
We'll have to wait for something like that, i suppose.

[vlado]

<shrug> V-Ray is a rendering engine, not a modeller It can render the vector displacement, if you have the respective maps already, and it allows you to create your own maps in certain cases. Beyond that, it isn't our purpose to create sculpting tools.

Best regards,
Vlado

[Neilg]

We'll have to wait for something like that, i suppose.

You've already got it, it's called mudbox/zbrush

[gagui]

Ok, anyway if the vray vector disp. bake material could bake complex geometry and not only sculpted i think it will be much more useful.
I think the weakest point is this bake material.

Maybe in a future release we could see a more advanced version of this bake utility.

Of course i think your job is great.

[giraffe]

Vector Displacement is basicly only usefull when you are sculpting something and for this its perfect. You can take your mesh into scultping app, sculpt it in any possible way can think of and then render out Vector displacement map out if it. The result from Low Poly Cage + Vector Displacement map should be IDENTICAL to the High Poly Scuplted Model. I don't know if zbrush and mudbox support proper vector displacement map generation but when they do this should be possible and it you should get it with a single press of the button.

The second case where its usefull is when you are programming some effects like sea surface.

Yes now I understand better.
I thought that with vector displacement, I would be able to displace a normal map with infromation of all 3 azis( x,y,z) as rgb channels. I see that it is different than this.
When I want to make grass displacement with bend strands, d you think the most memory effcient method will be a normal map in bump slot?

[gagui]

I think is possible to get vector displaced grass with the new tool in sp3.
The problem is to generate the apropiated vector displ. map.

[askhamdesign]

Would be good to see example maps that create stuff like the landscape image here

http://www.tunckaradag.com/2008/12/v...-new-features/

http://www.tunckaradag.com/wp-conten...splacement.jpg

[RErender]

Would be good to see example maps that create stuff like the landscape image here

http://www.tunckaradag.com/2008/12/v...-new-features/

http://www.tunckaradag.com/wp-conten...splacement.jpg

afaik that image is showing volume fog not vector displacement

[Morbid Angel]

there is one major limitation when using a vector displacement: you cannot adjust the map in secondary processing software like photoshop.
Often, when painting displacement you will go back and forth between the two. With vector map however there is no way to do that.