Problems with material connections

[Joppi]

Hi,

This might be a stupid question handled in some thread before, but anyway.

I have problems similar to texture mapps that are stuck together (that could be solved with TestSeparate mapping), If I create an object like a box and apply a material and a texture map (box mapping for example), then later on when I split the box and change material of one of the sufaces, the others or some of the other surfaces also change material!! Only thing to get round this error seems to be to redraw the object? Testseseparate mapping doesent work for this. I´ve tried to set material to "none" for every surface and then change again, with no result.

Is there any command like TestSeparateMaterials??? :-\

[dalomar_cg]

Re: Problems with material connections

What is it do you mean by "Split the box" and "some of the other surfaces change". The reason why I ask is that materials are NOT connected in the way that mapping is, so you shouldn't see any "link" between object of the same material when they are split. However, materials are not applied on a "face" level, but on the whole object, so at the moment it is not possible to have one surface within a poly surface have a different material than other surfaces in that same polysurface. You can get around this by extracting the surface that you'd like to have as a unique material. Is this what you're asking about?

[Joppi]

Re: Problems with material connections

Hi,

Sorry, my english is´nt the very best!

What I do is:
1. create a box (for example a wall of a building)
2. Apply a certain material (greyscale model material for example)

Later on:
3. Split the box, "the wall" (to create inner and outer walls with different materials and mappings)
4. Select on of the surfaces, "the inner wall surface", and apply a material
5. Select another surface, "outher wall surface" and apply a material on it. Its now the problems appears quite often. When changing materials of one of the single surfaces (wall 1) the other single surface (wall 2) also change material and vice versa. Please not that they are not grouped?

Have you seen this problem before? It happends now and then and is very annoying and time consuming. I often model a qiute detailed building with polysurfaces, and at the end split thenm to be able to apply different materials on single surfaces...

[Micha_cg]

Re: Problems with material connections

I have seen a problem like this some months befor and I thought it could be caused by an other render plugin. I found, that the problem is visible only if I used the object properties -> material -> browse/create button. Since I don't use the buttons anymore the problem was gone. I reported the bug some months befor, but the problem wasn't repeatable by ASGvis. My test was, that I assigned a material to two spheres. Here my old report:

* open the file
* enable rendered viewport
* assign the material "red" to the grey sphere per material editor
* select right sphere -> material properties -> browse -> choose "none"

-->> both spheres are set to "none"

But I opened the old bug file today and can't repeat the bug anymore. Do you use the latest release?

[Joppi]

Re: Problems with material connections

Ok, created a new scene with the problem surfaces. Two walls, where the material are connected in a mystic way.

http://www.johankauppi.com/rhino/test texture glue.zip

Try to change the material in just one of them. I´m running the latest release, so I would be so glad if some one finds a solution or what causes this.
(About plugin, just uses Penguin beside Vray now and then)

//J


EDIT: fixed the Link

[fpedrogo]

Re: Problems with material connections

Hi Joppi
The link doesn't work.

[dalomar_cg]

Re: Problems with material connections

Should be fine now...the link I mean. We'll still have to take a look at this

[dalomar_cg]

Re: Problems with material connections

I'm a little confused. In your scene both objects have the same material applied, so I'm just wondering why you wouldn't expect that material changes would be echoed on both surfaces. Am I missing something? Also, there weren't any maps for the material that was assigned to the surfaces, so including that would be useful.

One last note, it looked the surfaces were mapped together, so a material change will pick up the mapping that's already on the surface and any mapping updates on one will cause an update to the other, even though the surfaces now have separate materials. If this is what you're experiencing then this is still a job for TestSeparateMapping

[Joppi]

Re: Problems with material connections

Hi, thanks!

I just did´nt care to attach the maps, because I experienced that the problems were the same even if I just used basic rhino materials.

Yes you missing something , try not to change the materials itself. The problem is that you cant assign different materials on the two surfaces. Try to make just one of them basic yellow, and the other red or something. You will then see that both surfaces will be either yellow or red. Both surfaces changes when assigning materiasl on one of them And they´re not grouped. Assigning different materials should´nt be a problem just because of sharing the same mapping, right?

I hope You will notice this, so it is´nt just local on my rhino?

[merlik585]

Re: Problems with material connections

http://www.merlik.com/vray/2materials.jpg

http://www.merlik.com/vray/test- texture- glue.rar

works here :-\,or I don't understand what you are trying to do....

Renee

[Joppi]

Re: Problems with material connections

Renee,

Thats right, just what we´re trying to! It works for you then! Did you any changes

This is what it´s looks for me:
http://www.johankauppi.com/rhino/1.jpg
http://www.johankauppi.com/rhino/2.jpg

Easy to solve, just to extrakt bordes and rebuild, but very annoying when appears in large scenes... Hmm strange...or?

[merlik585]

Re: Problems with material connections

no nothing,just assigned material by object.Your surfaces are already 2 entities.

Renee

[Joppi]

Re: Problems with material connections

Ok. I now have been able to precise the problem. It must been a bug. The prolem explained above occurs when I apply materials to objects using the objects properties panel: Material - plugin - browse. Or: material - plugin - match.

When using the Vray Material panel - material - apply to selected objects, i´ts working just fine.

Only occurs for objects that have been applied with materials in same single command, earlier in process during modeling.
(using Vray version RHP 2008-11-05)

Seems to be similar to the bug you wrote aboute Micha?