Something like in this image . ( This is my own Photo, no Copyright infrigment here)

Thanks in Advance :)

I second the request! Need these types of shaders for Post Apocalyptic renders for a project.

I try out by my own, but my result is more than poor

I have ParrotDolphin's Metal shaders for Poser and they are wonderful.  The Patinas in the set may well get you exactly what you are looking for.

http://www.renderosity.com/mod/bcs/pd-metals-poser-materials/75048/

Thanks Glitterati :) They really look good. But I need it for a commercial product. So I have to make my own hands dirty ;)

This is a tricky and lengthy topic. Are you ready for a long discussion? If not, just draw it.

Yes, I am ready :)

Quote - Thanks Glitterati :) They really look good. But I need it for a commercial product. So I have to make my own hands dirty ;)

Hey LaDonna,

The link is to an MR, so you are free to use them in your commercial project (up to 12 seamless textures can be distributed with a commercial product).

Quote - > Quote - Thanks Glitterati :) They really look good. But I need it for a commercial product. So I have to make my own hands dirty ;)

Hey LaDonna,

The link is to an MR, so you are free to use them in your commercial project (up to 12 seamless textures can be distributed with a commercial product).

Yeah, I see. But I feel always unconfortable to use this kind of stuff in my Products.

Call me paranoid LOL

Here is a WIP. 100% procedural.

Hi !

I've donne this a long long time ago ina galaxy far far away ...

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2791955

Quote - Close up view.

Wow, This looks exactly what I had in mind.

Is this with MatMatic done?

Yes it's with matmatic. There are way too many nodes to do it by hand.

You have some Formula for me to play with it?Or you are still experimenting?

I try it with FB nodes but was somehow not really succesfull.

I assembled my little scene to demonstrate the final look I got. When I rendered overnight with IDL it looked terrible - full of artifacts.

So I decided to skip IDL and just use IBL+AO. The render is acceptable for realism and also takes less than a minute!! Quick rendering is a big help when I'm iterating a shader many times per hour.

I don't have a plan for explaining this - I will show you stuff in perhaps not the best sequence. Also I may have to pause as I have a lot going on today.

In my script, I start with a pattern, p. This pattern will describe the pattern of growth for the rust.

I define and view my pattern on the material like this:

p = Clouds(0, 1, Scale=.5, Complexity = 5)
View(p)

Render shows the result - no surprise, really.

(I will just be rendering the top part of one door for illustrations.)

p = Clouds(0, 1, Scale=.5, Complexity = 5)
t = .5
rust = Clamp(200 * (p - t))
View(rust)

p = Clouds(0, 1, Scale=.5, Complexity = 5)
t = .5
rust = Clamp(200 * (p - t))

paintColor = IColor(80, 103, 119)
rustColor = IColor(90, 30, 24)
color = Blend(paintColor, rustColor, rust)
diffuse = Diffuse(color, .8)

surface = View(diffuse)

So I'm going to define a start value, s, where the bubbling begins, then evaluate a section of the pattern between s and t. Recall that t is where the rust actually shows because the paint is gone.

For this illustration I also added some specularity (via Blinn) and I move a light into place to shine on the part of the door we're looking at. This helps reveal how the bubbling works.

....

surface = View(diffuse)

s = .1
bubble = Clamp( (p-s) / (t - s) ) - rust
surface.Displacement = .03 * bubble

surface.Alternate_Specular = Blinn(1, .1, .4)

Here I changed it so that s = .3 and the bubbles are now confined from .3 to .5.

So I define a new variable, paint, that is the opposite of rust. (1 - rust) This is my paint map.

I use the paint map to control the Blinn. Now there is no shine in the rust area.

p = Clouds(0, 1, Scale=.5, Complexity = 5)
t = .5
rust = Clamp(200 * (p - t))
paint = 1 - rust

paintColor = IColor(80, 103, 119)
rustColor = IColor(90, 30, 24)
color = Blend(paintColor, rustColor, rust)
diffuse = Diffuse(color, .8)

surface = View(diffuse)

s = .3
bubble = Clamp( (p-s) / (t - s) ) - rust
surface.Displacement = .03 * bubble

surface.Alternate_Specular = Blinn(1, .1, .4 * paint)

Rust has tiny flakes and bumps. When I want really tiny bump I sometimes use Noise, because I'm lazy, and it's easy. It works fine here.

I create a noise node with min=.4 (max=1 by default) and multiply it with my rust color. The rust looks a lot better.

noise = Noise(min=.4)
rustColor = IColor(90, 30, 24) * noise

I'm also going to drop back to just a tiny bit of shine since I want old nasty paint.

Here's the full script so far.

p = Clouds(0, 1, Scale=.5, Complexity = 5)
t = .5
rust = Clamp(200 * (p - t))
paint = 1 - rust

paintColor = IColor(80, 103, 119)
noise = Noise(min=.4)
rustColor = IColor(90, 30, 24) * noise
color = Blend(paintColor, rustColor, rust)
diffuse = Diffuse(color, .8)

surface = View(diffuse)

s = .3
bubble = Clamp( (p-s) / (t - s) ) - rust
surface.Displacement = .01 * bubble
surface.Bump = .05 * rust * noise
surface.Alternate_Specular = Blinn(1, .1, .06 * paint)

First, I'll just randomly darken some of the paint with another clouds node. The amount of darkening (.7) and the Bottom, Bias, and Gain can all be adjusted to your taste. (I could spend hours explaining the Clouds node alone.)

paintColor = IColor(80, 103, 119)
paintColor = Clouds(paintColor, .7 * paintColor, 2, Bottom=0, Bias=.6, Gain=.5)

paintColor = 1.25 * IColor(80, 103, 119)
paintColor = Clouds(paintColor, .7 * paintColor, 2, Bottom=0, Bias=.6, Gain=.5)

spots = Spots(0, 1, 1, .75, .9)
spotColor = .15 * IColor(200, 160, 165)
paintColor = Blend(paintColor, spotColor, spots)

paintColor = 1.25 * IColor(80, 103, 119)
paintColor = Clouds(paintColor, .7 * paintColor, 2, Bottom=0, Bias=.6, Gain=.5)

lspots = .25 + .75 * Spots(0, 1, 3, .7, .85)
spots = Spots(0, 1, 1, .75, .9) * lspots
spotColor = .15 * IColor(200, 160, 165)
paintColor = Blend(paintColor, spotColor, spots)

Now there is one last thing I want to show. This distribution of the rust pattern is wrong. It is completely the same everywhere. The number of rust patches and their size should not be the same everywhere. In almost every real object, the rust starts at the edges and grows inward. The inner regions resist the rust the longest. By the time rust shows in the interior, the edges have very mature rust patches.

So to deal with this we're going to want a rust intensity map (RIM). If you're making an object with traditional UV islands in one large UV map, then you're going to need to draw your RIM by hand.

For my case, I made these props with UV mapping 0 to 1 and straight, rectangular edges. So I can use nodes to construct my RIM.

However, my door is taller than it is wide. The size of one U is much less than one V. So I will adjust the V scale with a multiplier. By experiment I found that 2.5 was good.

I use an outer multiplier, k, to control the sensitivity of being close to the edge, and I invert the whole thing at the end because I want the value 1 to mean we are at the edge, and 0 to mean we are far from the edge.

The render shows the edge map. I will make my rust intensity map (RIM) from that.

k = 3
eu = Clamp(k * Min(U, 1-U))
ev = Clamp(2.5 * k * Min(V, 1-V))
edge = 1 - Min(eu, ev)
View(edge)

Notice the diagonal line where eu and ev intersect at the corners. If that isn't 45 degrees, you need to adjust the ratio. (Again - mine was 2.5)

So - here is the calculation and visualization of my cloud bias, which is my RIM.

k = 3
eu = Clamp(k * Min(U, 1-U))
ev = Clamp(2.5 * k * Min(V, 1-V))
edge = 1 - Min(eu, ev)
cb = .1 + .5 * Bias(edge, .02)
View(cb)

Entire script here:

k = 3
eu = Clamp(k * Min(U, 1-U))
ev = Clamp(2.5 * k * Min(V, 1-V))
edge = 1 - Min(eu, ev)
cb = .1 + .5 * Bias(edge, .02)

p = Clouds(0, 1, Scale=.5, Complexity = 5, Bias = cb)
t = .5
rust = Clamp(200 * (p - t))
paint = 1 - rust

paintColor = 1.25 * IColor(80, 103, 119)
paintColor = Clouds(paintColor, .7 * paintColor, 2, Bottom=0, Bias=.6, Gain=.5)

lspots = .25 + .75 * Spots(0, 1, 3, .7, .85)
spots = Spots(0, 1, 1, .75, .9) * lspots
spotColor = .15 * IColor(200, 160, 165)
paintColor = Blend(paintColor, spotColor, spots)

noise = Noise(min=.4)
rustColor = IColor(90, 30, 24) * noise
color = Blend(paintColor, rustColor, rust)
diffuse = Diffuse(color, .8)

surface = View(diffuse)

s = .1
bubble = Clamp( (p-s) / (t - s) ) - rust
surface.Displacement = .01 * bubble
surface.Bump = .05 * rust * noise
surface.Alternate_Specular = Blinn(1, .1, .06 * paint)

cb = .1 + .7 * Bias(edge, .32)

Thanks BB. Now I have something to play with it.

I really like the control about the rust.

Bias is a node wich I left aside often, but now I will try out more often.

cb = .3 + .7 * Bias(edge, .01)

You can incorporate the V node (or perhaps a P for position node) to modulate the cloud bias according to height above the floor as I've done here.

cb = .1 + .7 * Bias(edge, .01) + .4 * (1-V)

This concludes what I had planned to show you.

Here's a sneak peek. I've been using it to do this demo step by step, applying the edited script to four materials with a single keystroke or mouse click.

Looks like a fantastic new tool. Yes, I would like to test this new VSS  out.

I love Matmatic a lot. Amazing tool , after a quick and easy learning curve it is just pure fun .

Quote - If you like to use matmatic, you will probably want to be a beta tester for my new VSS with matmatic plugin. (Which will also work in EZMat)

Yes please :-)

I think for now not so bad :)

You need my Mail adress BB for the betatest?

I will send you a PM.

Exciting to test this new MatMatic.

If you like to use matmatic, you will probably want to be a beta tester for my new VSS with matmatic plugin. (Which will also work in EZMat)

Here's a sneak peek. I've been using it to do this demo step by step, applying the edited script to four materials with a single keystroke or mouse click.

I realise this is an ancient thread, but was wondering if anything further was done with this, BagginsBill? I'm quite keen to see an update to matmatic - use it almost as often as I use Poser - and this looks like a brilliant tool as well.