Royal discipline water / Right Tex-size for waterplane in mm

[sanny81]

Hello I have the following problem:

Right Tex-size for waterplane in mm

I draw in Rhino in mm therefore 1000 units (naval architecture).
In order to render correct water material, I have always set in Vray
0.00001 as the texture size (Bumpmap PNG 1000x1000 mm 72 dpi). It seems that the Bumpmap is too small for the scene.
I use only Bumpmap (Blend) + emitter + Reflection (Fresnel) on Infinite Plane (Planarmapping xyz World).
The subsoil is a surface texture with Coralriff map.
I've also tried to set the multi higher but nothing happens.

What am i doing wrong?
The blending Bumpmaps are both the same, but only different size (one ist double size).

Thanks for any help.

[img=http://img18.imageshack.us/img18/5056/scene.th.jpg]

[img=http://img16.imageshack.us/img16/4688/settingz.th.jpg]

[Micha_cg]

Re: Royal discipline water / Right Tex-size for waterplane in mm

I'm not sure I understand the problem. The problems are ...

* (1) bump hight to low

* (2) texture scale to big ...?

(1) the blend material is buggy (I'm not sure I reported it or not) - if the blend factor is higher than 1, than it is reset to 1 sometimes. I tested it here and it seems to be a bug of "texture B" only. If I remember me right I used the blend texture multiplier for the bump intensity.

(2) General: if the infinite ground plane is used, than the Rhino texture mapping dosn't work and the Vray "planar world xyz" must be used. I adjusted the size until it was good looking and it could be a value like 0.001, if I remember me right.

[sanny81]

Re: Royal discipline water / Right Tex-size for waterplane in mm

Hallo Micha!

You are right, only the second Blend Material switch to 1 if i set him higher.
This might be a Bug.

You have underststood the problems right. If the wave texture ist set to 0.00001 scale
Vray make it big. But it is still too small.
If i scale the texture in PS to double or bigger scale than the RAM take @ 900mb
more than without. Its no problem for my PC (@16GB ) but Rhino stops normaly @ 3,6 GB

And the secound problem is that my Multiplier doesn´t seem to work right, becouse nothing
is happening when i set him higher. Maybe its because the bug in Blendmapping.


I think its probably better to use only blendmaterial under defuse material.
So i set the Bumpmap only to bitmap and blend my two scaled Pic´s (Procedural or Noise) in a thirdparty Program like PSCS4 to get only one Bitmap. 

Is it a good idea to use Displacement for the near sections around the ship on a single plane
and Bump the infinite plane for getting the rest of the horizont?

I am a big fan of your Stills, mostly the one with the sailingyacht.

...and sorry for my bad english, i hope u understood what i mean.

[Micha_cg]

Re: Royal discipline water / Right Tex-size for waterplane in mm

Hmm, I don't understand why the multiplier dosn't work. I used it in the past. Did you try a very high multiplier? Yor scene unit are mm so your bump should be 100 ... 300 (mm).

Never upscale textures, that waste your RAM und you don't get more details. The scale of the texture at your scene is independent from the image size. You must set the repeat option at the material texture UI (or Rhino mapping, but not for infinite groundplane). So, you must set the right scale number at the wave texture UI of VfR.
At my gallery thread is a screenshot of a water material on an infinite groundplane.

http://asgvis.com/index.php?option=c...0&topic=351.75

Also you could play with the procedural noise of VfR.

Your english is ok, my isn't better.

[sanny81]

Re: Royal discipline water / Right Tex-size for waterplane in mm

Good Morning Micha,

i will try today some outher settings.

Your Image 35 @ your Post in the Link above is very nice.

Did u use Bump with Blending for upper water surface?
Did u set fresnel 1.55 for reflection plus 1.33 (water IRO) for refraction?

I have one general question about IOR setting.
My question is where do i have to put the IOR nummber because there are one IOR @ upper section
and one after klicking the m (meterial section) for each reflection and refration.

thanks micha!

[Micha_cg]

Re: Royal discipline water / Right Tex-size for waterplane in mm

image (35) - if I remember me right the upper surface is a glass material with all IOR at 1.33 (I set all values at the same value allways) and a wave bump texture map on a simple plane. For that image I don't used a blend material, only a single texture map. A blended bump material I used at the image on page 6 of the gallery thread.

[sanny81]

Re: Royal discipline water / Right Tex-size for waterplane in mm

Wow, thanks a lot Micha!


I think i use only Bumpmapping and Reflectionmap,
because than my watersurface takes the colour from my Sky or hdr.
looks very good so far. I have only one problem.
If i use reflection, then i don´t get any transparence. I cant see my ground plane (coral riff). Cause of my reflection channel i think. But this i can fix with using some standard Glass Material.

I have an idea to create fake Highlights on upper surface.
If i set my Multiplier high enough, then i can see some highlighting points on bumps top.
But only a poor solution, it work for swimming perspective only.

For Bumpmap i use now a 6000 x 6000 @ 72dpi (real size 5 sqaremeter´s)) watersurface createt with filterforge Trailversion.
Very good Program i think to generate Render Textures like normalmap bump & diffusemap in very high resulution. ;D

[Micha_cg]

Re: Royal discipline water / Right Tex-size for waterplane in mm

If i use reflection, then i don´t get any transparence. I cant see my ground plane (coral riff). Cause of my reflection channel i think. But this i can fix with using some standard Glass Material.

No transparence? I don't know, but the standard glass material at IOR 1.33 should be a good basic water.