Help with Vraydisplacment

[trixian]

If possible, try doing your displacement maps in zbrush2 in the future. Once you get a grip on the quirky ui, you'll want to do displacement all the time

[Robur]

Hi - I am having my first go at Vray displacement ..... can I ask another question? I have a black and white 8bit grey jpg DM - this is made from the diffuse map & is effectively black & white vertical strips. I was hoping to see the geometry stepping in and out with nice sharp angles (90degs) but I am getting softer trapezoidal shapes The texture is for vertical timber wall made from 2 layers of planks..... any clues would be great.

Cheers, Cameron

[Robur]

Hi.... to help illustrate the problem here is a picture, Cheers.

[joconnell]

If you havent done it already, turn down any blurring on the bitmap that you are using for the displacement in the material editor for starters.

[Robur]

Thanks Jo - that helped...... still trying to find how to get the map to cause a straight forward extrusion of the surface?..... this is what I have now & my settings? Cheers

[Robur]

.... If anyone can help.... I just can't get this figured !!

The DM is a black & white GIF (2 colours/ no AA)
The Map is in the material displacement slot at 100% as Bitmap with blurring at 0.01 (min) and filtering = none.

I just cannot seem to achieve a straight extrusion.

Thanks in advance.

[Candelero]

Send us the scene < nikki@chaosgroup.com >

Best regards,
nikki Candelero

[studioDIM]

The VRayBmpFilter textmap should help you in that regard.

Try using that to load your bitmap in the displacer, rather than the standard Bitmap map.

Also, i'd use 2D displacement, rather than 3d...
Put the VRayBmpFilter map in the appropriate slot in the displacement modifier, and make sure "Filter Bitmap" it's turned off.

Regards,
Lele

[Robur]

Hi Lele, thanks, I tried your tips and I still seem to be going wrong.... here I have done a test using a checker map and as you can see the extrusion is still tappered...... I am guessing it can be done...?



Thanks for looking Nikki.... any luck?

[RErender]

Hmm that's wierd I have done it with a checker map and gotten correct results...

[studioDIM]

the checkered map has a blur filter on itself.
If you turned that off (o.o1), and still it doesn't work, make sure you render the map to a file, and use high enough samples in the 2d displacement mode (my tests led to good enough results on a plane with 1024 samples, unless i looked at it from too close a viewpoint.).

However, my personal opinion is that for such regular patterns, you're MUCH better off editing the Poly object.
Add an Edit Poly modifier, make sure the "Preserve UVs" checkbox is selected, and just select the two opposed edges of your plane. A simple "connect" command will allow you to add as many segments as you wish between the two and then use the "chamfer" command on the newly created edges.
The last step would be to extrude the faces you just created, giving you a nice and sharp edge between the wood planks.
All in all it's a 30 seconds job, and it saves you a lot of rendertime.

Use the diplacement feature afterwards on the wood, to give it SMALL credible bumps, even at high glancing angles...

Hope it helps...

Regards,
Lele

[Robur]

Hmmmm...... so it can be done ... which version of Vray are you on Eric? This is done on 1.48.03..... is there any chance I can test your scene on my machine?

That's a good mini tutorial Lele, my modeling is all done in ADT, my Max modeling skills are basic so especially good to have you explain this - I will have a go.

Thanks for all the help

Cheers.

[DaForce]

yeah for something simple like those wood planks i would definitly just model in the detail like studioDIM said.. just a 30seconds or so and your done. PLus would render much faster than if you used displacement.

[studioDIM]

Lele!

My name is LELE!

studioDIM is the studio i work for...

like calling Vlado chaosgroup...

[DaForce]

LOL true but not everyone around here is known by their first name. Everyone calls me DaForce but that certainly aint my real name.

But in future you shall be known as Lele