Layer Type · Fill
Fill Layer
A flat, editable set of values — colour, roughness, metallic — with no image and no painting. It’s the parametric base layer almost every material is built on top of.
A fill layer — roughness swept live from glossy to matte.
What it does
A fill layer holds uniform values: a base colour, a roughness amount, a metallic amount — sliders you can revisit at any time. There’s no texture and no render cost; it’s the flat foundation a stack starts from.
One fill can feed several channels at once, so a single layer can set the colour, the metallic and the roughness of your base material in one move — then everything above it (paint, procedurals, wear) composites on top.
Controls
Three values, editable forever.
Base Color
A solid diffuse colour for the whole layer.
Metallic
Dielectric to metal on one 0–1 slider.
Roughness
Mirror-sharp through to fully matte.
Multi-channel
One fill can drive Base Color, Metallic and Roughness together.
In practice
The bottom of almost every stack.
- Base Color a warm brown.
- Metallic 1.0 — it’s metal.
- Roughness 0.35 — a soft sheen.
- Uniform — the values are flat, so there’s nothing to unwrap.
- Free — no texture memory, changes are instant.
- Also a tint — a low-opacity fill on top grades everything below.