Help with bumpy shiny surface

[Bosseye]

Hi there,

I've been struggling with this for a while; can anyone give me some tips on how to make a simple bumpy shiny surface like the image below?

I've been trying to apply a simple bump map to a shiny surface with no luck - the UV scaling is too small and I can't figure out how to get it larger (despite writing a tutorial on here a little while back for how to set UV mapping in Sketchup...! Even following my own steps it simply won't work).

Maybe because its a curved surface, I don't know.

Anyway, some help would be appreciated.

bumpy glass.JPG (16 KiB) Viewed 9610 times

Thanks,

[FakeShamus]

I'm not a skecthup person, but my go-to random bumpy surface is always done as an ISL shader:

Code: Select all

def eval() real:

noise(posOS()*100)*0.0001

start from there and change the posOS()*value (higher number makes smaller bumps, lower means larger).
and the 0.0001 value controls the height of the bump - sometimes this needs to be very small in order to look correct.

[Bosseye]

Hey thanks for that - I've never touched ISL before though, is this something I would have to do via the Material Editor? For some reason I don't have that installed....

[CTZn]

In the SkIndigo material editor, change the map type for bump from texture to shader, and there you go.

Shaders can be edited in real time while rendering in Indigo. You can also change the texture scaling in the Indigo texture editor, it's weird but change the two "1" arranged in a square with zeroes to a different value.

Try it and tell back

[Bosseye]

Hey this is cool! Managed to mess it up initially though, I just added this line:

noise(posOS()*100)*0.0001

underneath the def eval which was already filled in like this:

def eval() real : fbm(posOS()*4.0, 2)*0.02
#This is a fractal noise shader.
#4.0=Position scale
#2=fbm octave
#0.02=multiplier (eg. height for displacement

And ended up with this:

Which is cool but wrong!
And then I engaged my brain and removed the def eval code and just added the code exactly as FakeShamus had noted and I get this:

Which is much better!
So with a little bit of fiddling, I get this:

Which I think is just about right (aside from the colour which I will tweak). The bump won't be so obvious when the material is in the rest of the scene and properly lit.

Thank you both so much, you've really helped me out.

[Pibuz]

I'd have used the ISL too to get the right result, even if I don't know almost anything about it

...I actually think that sooner or later some sort of graphic controller will have to be integrated in order to get all users understand and USE the ultrauseful ISL (I don't know: primary functions such as fractal noise, noise, speckle and so on to be chosen from a list, and then sliders to adjust the scale and power of the shader..)

In your case, I'd have also tried to map the surface using a simple sketchup material with the bump texture as diffuse map. Then, in the material editor, switch the albedo slot from SU to NONE and select that blue/green-ish tint to colour you surface. This way you could still use the bump texture referenced to SketchUp mapping without having to fiddle around with it. Did you think about it?

[bubs]

I don't know: primary functions such as fractal noise, noise, speckle and so on to be chosen from a list, and then sliders to adjust the scale and power of the shader..

+1

[Zom-B]

Just like fused did for the C4D exporter:

[Oscar J]

WTH! Why does Indigo not have that?

[Zom-B]

WTH! Why does Indigo not have that?

This is a "simple" GUI that controls some ISL Shader parameters inside C4D.
Indigo does have something like that, but for that some artist/coder needs to setup the material nicly in the first place!
Like the material in this thread: http://www.indigorenderer.com/forum/vie ... 23&t=13032

[Pibuz]

I WANT THAT FOR SKINDIGO!

[Juju]

I WANT THAT FOR SKINDIGO!

+1!