does HDRI affect quality of texure?

[Vinch]

Hi guys I've been trying to test a render with HDRI but I can see that the texture get affected by that.
If you look to the building above: cladding looks like is bad resolution a little bit pixelatedt.
Is this normal? I have been thinking about that and cam up with the idea that maybe is depending on the quality of the HDRI.
I can show you how the quality of the texture of the cladding is quite different.
the color of course, but I feel that is the quality also.
What do you think about that? Got any idea?
thank you

this is with HDR


and this is with only default lights

[dalomar_cg]

Re: does HDRI affect quality of texure?

No, it shouldn't. There just seams to be a different contrast level between the two images. Also, with the HDRI you're zoomed out a bit more, and there might not be enough antialiasing to really get it as sharp as the close up one

[Vinch]

Re: does HDRI affect quality of texure?

No, it shouldn't. There just seams to be a different contrast level between the two images. Also, with the HDRI you're zoomed out a bit more, and there might not be enough antialiasing to really get it as sharp as the close up one

thank you Dalomar.
i did another test and I start to wonder if it can be anisotropy that needs to be fixed.
what do you think?
Could you tell me which way is the best to get a better quality? is it only resolution?
At the moment I'm using irradiance map and licht cache.
if you se this first image



the cladding looks not so well defined as it looks in this image



I understand, like you sayd that it can depend on antialiasing...
so how could I fix that?

thank you
Vinch

[Jackson_cg]

Re: does HDRI affect quality of texure?

Vinch,

I'm not sure if I understand correctly, but do you mean that the detail is being lost in the zoomed out render? You could try just increasing the IM "HSph Subdivs" parameter to maybe 200- that might help pick out the details better.

Sorry to hijack your thread, but I'm dying to know how you did that black metal sheet material? Is it actually reflective, or is the blue tinge from the original texture photograph? Did you apply a bump map for the seams? It's easily the best black metal sheet materials I've seen and I'm working on a project which uses that exact material at the moment. I'm not looking for freebies, but if you can just offer a couple of tips on how you got that material looking so good I'd be very grateful.

Thanks,
Jackson

[Vinch]

Re: does HDRI affect quality of texure?

Vinch,

I'm not sure if I understand correctly, but do you mean that the detail is being lost in the zoomed out render? You could try just increasing the IM "HSph Subdivs" parameter to maybe 200- that might help pick out the details better.

Sorry to hijack your thread, but I'm dying to know how you did that black metal sheet material? Is it actually reflective, or is the blue tinge from the original texture photograph? Did you apply a bump map for the seams? It's easily the best black metal sheet materials I've seen and I'm working on a project which uses that exact material at the moment. I'm not looking for freebies, but if you can just offer a couple of tips on how you got that material looking so good I'd be very grateful.

Thanks,
Jackson

Hi Jackson!
thank you for your suggestion. I'm going to try.
About the metalplates:
it wouldn't be any problem to share the vismat with the texture, do you know any site for rapidshare? because I don't, i'm a little bit newbie in this.
BTW I can tell you that I used 1 texture in the diffuse map.
downloaded from this website
http://www.cgtextures.com/texview.ph...8a367d32d351f9

it was green plates, so I had to modify in PS from the channelmixer.

Then I used the same texture for bump, black and white, but inverted so that the seams are white and the plates black(in this way the seams get a little bit of relief)

Then the material has also reflection (fresnel IOR 12, fresnel color 18,18,1 with highlight g. 0,9 and ref.g. 0,8 anisotropy 0.5 sub. 50)

And I used also the texture b/w for the filter, but this time is b/w not inverted (the seams are black and the plates are white) so that the seams don't get any reflection and in some areas reflection is reduced.

SO I guess the final result is a little bit of everything (texture + reflection)

Actually I'm still working on it, since I want to give it a copper/bronze color.

Good luck!
V

[Jackson_cg]

Re: does HDRI affect quality of texure?

Wow, thanks for all the info! I've actually seen that texture at cgtextures before when I was searching for suitable bitmaps, but I didn't think it'd work anywhere near as well as it does in your image- you really did a great job with it.

[Jackson_cg]

Re: does HDRI affect quality of texure?

Did you mean you could post the files on Rapidshare? That would be very generous!

http://rapidshare.com/

[Vinch]

Re: does HDRI affect quality of texure?

Did you mean you could post the files on Rapidshare? That would be very generous!

http://rapidshare.com/

No problem Jackson, if you like it it would be a plesure to share it
I'm going to do ASAP.
V

[Vinch]

Re: does HDRI affect quality of texure?

Did you mean you could post the files on Rapidshare? That would be very generous!

http://rapidshare.com/

Lol, now It turned out that it doesn't let me export the vismat.
Can anyone tell me why?
it is a linked material from sketchup, when I export the material from v-ray it says "cannot find native material".
Do I need to export the material also from the sketchup library?
Ok, for now I've uploaded just the three texture I've used.
the settings are not so complicated, just follow what I wrote above.
I hope I'll figure out how to export a linked material
V
http://rapidshare.com/files/15877889...lates.zip.html

[Jackson_cg]

Re: does HDRI affect quality of texure?

Are you using v.1.00 or v.1.00.74? I didn't think the latest version allowed the error message ""cannot find native material" as all materials are inherently now linked. That message usuallu just comes up if you have a VfSU linked material in the VfSU material editor, but the original SU material has been deleted or renamed.

Thanks so much for these maps, I got on pretty well by just following your settings yesterday, but with your maps I might be posting in the gallery soon (with credits of course)!

[Vinch]

Re: does HDRI affect quality of texure?

Are you using v.1.00 or v.1.00.74? I didn't think the latest version allowed the error message ""cannot find native material" as all materials are inherently now linked. That message usuallu just comes up if you have a VfSU linked material in the VfSU material editor, but the original SU material has been deleted or renamed.

Thanks so much for these maps, I got on pretty well by just following your settings yesterday, but with your maps I might be posting in the gallery soon (with credits of course)!

Yes I thing my office has v.1.00, that's why.
I know this is not the topic of the tread! but just one question: is the v.1.00.74 a floating license (I mean after one has the original can just gets the release one also?)
I'm still new with rhis kind of thing, hope my boss wants to upgrade it because it seems to be so much more funny
Good luck with you render, I look forward...glad that this thread could help you...
V

[Jackson_cg]

Re: does HDRI affect quality of texure?

Yep, your v.1.00 license will authorise v.1.00.74 (and hopefully v.1.00.75!).

There are definitely advantages to updating to v.1.00.74 (much better material handling), but there are serious problems also, the most important for me being that it takes forever (well, 20+ minutes) to parse models which contain groups and components which have materials applied to them (rather than the geometry itself). It means you have to do a lot of re-texturing work to each and every existing skp/VfSU model to get them to parse in a reasonable time in v.1.00.74, it's a major headache. Check out this thread for discussion and a link to a very useful ruby script if you decide to update:

http://asgvis.com/index.php?option=c...0&topic=5136.0