question about Material UV settings

[minimar]

Sorry for my english in the first place

We are an architectural studio which is thinkning about buying the vray aplication
for the sketchup.
So i have downloaded the trial version of it. I have one major problem with it
Can anybody please explain me what does it mean U and V in materiel size, we are working in
milimeters or meters units. I do understand it is some kind of texture size but When i have putted in
the U or V box number 1 it makes a terrible noise like a million little textures. When i have putted
0.01 it has worked but it makes no sense. The size of the object was 1x1x1 meter.
Please explain that it will be clear to me, so i can put the order on my boss's table.

thanx

[dcauldwell_cg]

Re: question about Material UV settings

I am finding it much easier to use 'linked' materials. That is, you apply materials in sketchup, make any adjustments you want in sketchup and in the vray linked material add reflective layers, bumps etc. So you don't need to bother with the u, v, settings at all.
see this posting for an example http://www.asgvis.com/index.php?opti...12002#msg12002

David

[minimar]

hmmm

Taht is simple not enough and that is because what will yuo do with bump map
if you dont understand the size mattrer??

[dcauldwell_cg]

Re: question about Material UV settings

I don't know how it works - but it does.
When you apply the bump map in vray materials to the linked material (which is the same image size as the texture image applied in sketchup) it just matches up.

Maybe one of the moderators can explain (help!)

Its easy - honestly!

David

[dalomar_cg]

Re: question about Material UV settings

This is by no means an official explanation (Joe can give you that), but here's my understanding of whats going on.

By default objects in SketchUp do not have any UV information (which is basically the texture space coordinates of an object). So that means that that information has to be created. You can do this within our texture options, but its quite cumbersome to do it that way and there aren't really very many options. The second way is to use SketchUp to generate the UV information. That requires using SU mapping tools and setting up a linked material. Now once you've done that, the UV information that is created can then be accessed by mappings within a V-Ray material. Hence the reason why bump mappings will line up with the map of the linked material. Hope this helps/makes sense. For more info on setting up linked materials please consult the V-Ray for SketchUp manual.

[minimar]

Re: question about Material UV settings

OK
question 1
so how am i supostted to aply a vismat material where everything is allready setup?

question 2
am i able to create a plane material only with bump layer?

question 3
when i have created a linked material bump has worked but displacemnt has not why? is there anything i ca do about it in settings?

[dcauldwell_cg]

Re: question about Material UV settings

Minimar
1-if everything (textures/materials) are already set up in sketchup then you don't need to do anything - it will render with those settings (as with the brick in the example below). You only realy need to create linked materials or add vismat materials when you want to improve on what you get with sketchup. So for instance you may want decent reflections off materials, or add bumps, only then do you need to use the linked and vray materials.

2- see the example below. the left and right faces had a a brick texture applied in sketchup. However, the face on the right has had a vray (plain) material applied to it. You can see that it has overwitten the sketchup material. To answer your second point - this is a plain vray material with a bump.

3 - not sure what you mean with question 3!

Hope this helps:-
(if all else fails - read the manual!!)

[minimar]

Re: question about Material UV settings

as for my question one : still no answer because i do not want to use only linked material and why? because it is not only about bump its also about blend, noise, checker etc. and none of those i can use if i am using linked material. So i have to know how to put in U and V or creating it.

2: what u or v have you putted in for that plain vray material?

3: i have ment that displacement is not working and bump is. Why

theese things are not in the manual i have red it twice. It is the first place that
I am looking for the answers.

[dcauldwell_cg]

Re: question about Material UV settings

Believe it or not I am trying to help here!

1 - bumps etc. can be applied to linked materials I used them on several of the materials in my render (http://www.asgvis.com/index.php?opti...12002#msg12002) These are all linked material except for the glass (vismat glass)

2 - on the plain vray material in the example, I used 0.5 for u and v (it is tricky to get the u and v right as several threads on this forum have discussed, thats why I have only used the linked materials - its easier that way)

3 - someone else will have to respond on displacement (I just use bumps!)

David

[minimar]

Re: question about Material UV settings

I believe you wnat to help.

But the thing is, you are using only the linked material and the bump, but
i would like to understand or to know how to use things in the difuse M box which
i cant use when i use linked material. Realy no offence. If it does not work properly
,would be eough to say from moderators or somebody who knows that it is not working and I will not waste any more time with it, and wait until it will be solved out.

So realy please moderators help us (i have noticed that i am not only one who is asking
about for example displacement) we apreciate it very much.

martin

PS I am using sketch up since its V3 and the vray is one of the best things which
came to its way. It is great plug in and i admire yours work. I am just realy
curios.

[kwistenbiebel1]

Re: question about Material UV settings

Minimar,
I understand your concerns, since I also struggle with it.

Basically you want to assign a pre-made .vismat to your objects right?

I would expect the following workflow:

1. Assigning (and positioning) the same texture to the Sketchup material as the diffuse texture of that future vismat you will import. In this way it should preserve the texture coordinates and scale (uvmappings)
2.In the Vray material list I would expect to see automatically the corresponding vray material using that same texture in the diffuse slot.
3.Clicking that Vray material and importing the vismat material.
4. DONE.

However,
It doesn't work like that :-[

I don't understand why the Sketchup materials aren't automatically converted to the Vray material list.
Instead, this all has to be done manually, selecting each and every SU material seperately and then make a vraylinked material for each of them. If you have a SU material list containg dozens of materials, this can be a tedious job.

It kind of spoils the joy of using VfSU.
I brought this matter to the ASGVIS team before in beta period.
As I understand they will revise some things in the workflow department now the product is fully finished.

Maybe a little patience will bring answers.

Cheers,
Kwistenbiebel

[joe_b]

Re: question about Material UV settings

as for my question one : still no answer because i do not want to use only linked material and why? because it is not only about bump its also about blend, noise, checker etc. and none of those i can use if i am using linked material. So i have to know how to put in U and V or creating it.

Right now you have 2 options for creating your UV information. The first - and generally easier to work with - is to apply a texture in SketchUp to a face. Sketchup only generates uv information if a texture is applied to the object. Otherwise the uv information is just trash values.

Your second option is to use one of our planar uvw generators. You can choose these from the texture editor. By default the uvw generator is set to "Explicit map channel". That is the one you use if you are relying on SketchUp faces for uvw information. But you can change that to use planar uvw.

The reason I believe everyone here is suggesting to use linked materials is because that way you can apply a texture to the sketchup face with a sketchup material and then just link to that material. Then the uv info is coming from Sketchup and is easier to manipulate by using Sketchup's uv tools.

3: i have ment that displacement is not working and bump is. Why

Someone else has brought this up - I was under the impression it was working, but I'll look into it.

[dalomar_cg]

Re: question about Material UV settings

Here are my suggestions for your concerns. The thing about a linked material all it does is reference that Sketchup material for that specific layer. However, this doesn't prevent you from adding any additional layers to the material. So I would suggest that you create a linked material, but simply add a layer on top of the linked layer to put whatever else you want on your material (noise, checkers, blends, or what have you). That way you can use sketchup to create the UV information (as everyone on this thread has been saying) and still use the textures that you want to use.

As for displacement, it is working. The multiplier for displacement will reference your scene units, so that may wind up being a bit to small to really notice. You can try increasing either the texture multiplier of the displacement map, or under V-ray options go to Displacement and increase the Amount.

[kwistenbiebel1]

Re: question about Material UV settings

....So what would actually be the fastest way to assign a premade vismat (or a downloaded one) and have Sketchup UV-mapping?


Thanks

[minimar]

Re: question about Material UV settings

uuuf

guys i have still no luck not at all with displacement
my geometry is 1m x 1m plane
i have created linked material, bump has worked (multiplier 10) then i have switched off.
Then i have putted tahe same texture as a displacemnt map with multiplier 1000
displacement settings:
edge length....100
max subdivisions...256
amount 1000

I think the numbers are enough big to notice any difference on trh render, but there is none. What posibly can be the problem please.