3ds Max Noise Reverence

For a 1960’s metal pencil sharpener, you’ll mainly want three procedural layers:

1. Base painted metal
2. Paint wear / chips
3. Scratches + oxidation

Arnold works best when these are separate masks layered together rather than one big noise map.

Below are some procedural recipes that work well for vintage metalware.

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1. Paint Chips (the big worn edges)

This is the most important layer.

Node recipe

aiCellNoise
   scale: 4–8
   jitter: 0.9
   randomness: high

Pipe into

aiRange
   contrast: high
   smoothness: low

Then use as mask in

aiLayerShader

What this does

Cell noise produces irregular paint islands.

Tip

Add a little distortion:

aiNoise → distortion input
scale: 2

This prevents the chips from looking too computer-perfect.

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2. Edge Wear Mask

Real wear occurs mostly on convex edges.

Node

aiCurvature
mode: convex
radius: 1–2

Multiply with noise:

aiNoise
scale: 10
octaves: 3
distortion: .2

Combine using

aiMultiply

Result

Paint chips appear mostly on corners and edges, like real objects.

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3. Fine Scratches (steel under paint)

Scratches are mostly directional.

Node recipe

aiNoise
type: linear
scale: 200
anisotropy: high

Then:

aiRange
contrast: high

Use as bump map.

Tip

Rotate the UVs slightly so scratches aren’t perfectly horizontal.

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4. Rust / Oxidation

Rust appears inside chips and crevices.

Node setup

aiCellNoise
scale: 12
randomness: high

Multiply with

aiAmbientOcclusion
spread: 0.6

This concentrates rust where water collects.

Color

Rust usually ranges:

dark rust   RGB 0.25 0.08 0.02
orange rust RGB 0.5 0.22 0.04

Use a ramp node.

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5. Subtle Paint Variation (important)

Even painted metal has uneven tone.

Node

aiNoise
scale: 3
octaves: 4
distortion: .3

Multiply with base color.

Variation should be very subtle (~5%).

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Example Arnold Material Stack

Layer 1
Bare steel

Layer 2
Paint

Mask
CellNoise * Curvature

Layer 3
Rust

Mask
AO * CellNoise

Bump layers:

fine scratches
+
micro noise

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Steel Base Settings

For a vintage sharpener:

metalness: 1
roughness: 0.25
specular color: slightly warm

Paint layer:

metalness: 0
roughness: 0.4

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💡 A small trick used in film assets

Add two different scratch scales:

large scratches: scale 150
micro scratches: scale 800

Mixed together they look far more realistic.

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✅ If you’d like, I can also show you a very compact Arnold node network (about 9 nodes) that produces convincing chipped vintage paint without needing texture maps.

It works extremely well for objects like your pencil sharpener and is fast to tweak.