What Is an Emissive Map? Make Surfaces Glow

7 min read · Last updated May 2026

Split image of a sci-fi panel — left the black emissive map with bright glowing line patterns, right the final rendered panel with those lines glowing cyan in a dark room
The emissive map (left) marks what glows; the result (right) shines in the dark. Black = no glow, bright = full emission.

You know that feeling when a glowing screen or a lava crack stays bright even in a pitch-black room? That’s an emissive map at work. It’s the one PBR map that makes a surface ignore the lighting and shine on its own — the difference between a dead grey monitor and one that’s switched on.

Emissive is the map that powers every screen, neon sign, sci-fi panel, and lava flow in games. This guide explains what it stores, whether it actually lights the scene, how intensity and bloom work, and how to make one.

What an emissive map stores

Every other PBR map describes how a surface reacts to light. An emissive map describes light the surface produces. It’s a colour texture, usually black across most of the surface, with bright coloured areas where the surface glows — the screen, the neon tube, the lava vein. Where the map is black, there’s no emission and the surface behaves normally; where it’s bright, it shines at that colour no matter how dark the scene.

That “ignores the lighting” part is the whole point. Albedo goes dark in shadow; emissive does not. It’s why a phone screen reads in a night scene and a magma crack glows at the bottom of a cave.

An emissive map for a control panel — mostly black with bright glowing cyan and orange shapes where the buttons and screens emit light
A clean emissive map is mostly black with bright coloured glow exactly where the surface emits. Black is “off”; colour is “on.”

Does emissive actually light the scene?

This trips everyone up: by default, no. An emissive map makes the surface look like it’s glowing, but it doesn’t cast light on nearby objects on its own. To make a neon sign actually illuminate the wall behind it, you add one of:

  • Bloom — a post-process halo that makes bright areas bleed, selling the glow cheaply.
  • Global illumination — some engines let emissive surfaces contribute real bounced light to GI or lightmaps.
  • A real light — place an actual light next to the emissive surface so it casts properly.

Most glowing effects you see are emissive plus bloom. The emissive map does the shape and colour; bloom does the halo.

Intensity and HDR: how bright is the glow

The emissive texture holds the colour and pattern, but the material has an emissive intensity that scales it — and it can go well above 1.0 into HDR values. A high intensity is what pushes a surface past pure white into a blooming, burning glow. Author the map for the shape and colour; dial the intensity for how hot it burns.

Side-by-side of a sci-fi corridor — left with no emissive, dark and dead; right with emissive panels and strips glowing brightly
Left: no emissive, a dead grey corridor. Right: emissive panels and strips switched on. Same geometry, same lights — one map.

Emissive in the PBR set

Emissive is an optional extra on top of the core PBR maps. The albedo, normal, roughness, and metalness maps describe the non-glowing surface; the emissive map adds the parts that light up. A screen, for instance, still has a slightly rough glass surface (roughness, normal) plus the bright image it displays (emissive).

A horizontal strip of PBR texture map tiles for a sci-fi panel — base colour, normal, roughness, metalness, and an emissive map glowing cyan on black
The emissive map (far right) joins the core set, adding the glow on top of the normal surface maps.

How to make an emissive map

  • Start black — black means no emission anywhere.
  • Paint the glow in colour — the screen, the runes, the lava veins, tinted to the glow colour you want.
  • Mask from the base colour — often the emissive shapes match features already in the albedo, so you can derive a mask from it.
  • Set intensity in the material — push it into HDR for a strong bloom.

CraftPBR can include an emissive channel in a generated set for surfaces that glow — the same text to texture workflow, with the glow mapped out for you.

Generate PBR sets, glow included
Describe a surface — glowing or not — and get the full PBR map set for any engine. Free.
Open Studio →

Emissive maps in Unity, Unreal, Blender, and Godot

  • Unity — assign to the Emission slot and set the emission colour and HDR intensity; enable it for GI if you want bounced light. Import as sRGB.
  • Unreal — plug into the Emissive Color input, multiply by a scalar for intensity; values above 1 drive bloom. Enable emissive for Lumen/lightmass GI if needed.
  • Blender — connect to the Emission Color and set Emission Strength on the Principled BSDF; Cycles emissive contributes real light, Eevee needs bloom.
  • Godot — enable Emission in StandardMaterial3D, assign the texture, set energy; works with the glow post-effect for bloom.
A dark cyberpunk alley at night lit by glowing neon signs, holographic screens, and LED strips, all driven by emissive maps with bloom
Neon, holograms, LED strips — every glow here is an emissive map plus bloom. Emissive is the soul of any cyberpunk or sci-fi scene.

Key takeaways

  • An emissive map marks which parts of a surface emit their own light, ignoring scene lighting
  • It’s mostly black (no glow) with bright colour where the surface shines
  • By default it doesn’t light the scene — add bloom, GI, or a real light for that
  • Emissive intensity scales the map into HDR for a strong, blooming glow
  • It sits on top of the core PBR maps, adding the glowing parts to a normal surface
  • It powers every screen, neon sign, sci-fi panel, and lava flow in games

Frequently asked questions

What is an emissive map?

An emissive map is a texture that tells the renderer which parts of a surface emit their own light — glowing screens, lava cracks, neon signs, sci-fi panels. Where the map is bright, the surface shines at full colour regardless of scene lighting; where it is black, the surface behaves normally and just uses its other PBR maps.

Does an emissive map actually light up the scene?

Not by itself. An emissive map makes the surface appear to glow, but it does not cast light on other objects unless you add bloom, global illumination, or a real light source. Many engines let emissive contribute to GI or lightmaps; otherwise it is a visual glow only, often paired with a bloom post-effect for the halo.

What is the difference between an emissive map and an albedo map?

An albedo map is the surface colour that the engine then lights. An emissive map is colour that ignores lighting and shines on its own. A dark room makes albedo go dark, but emissive stays bright — which is exactly why glowing screens and lava read in shadow.

Should an emissive map be sRGB or HDR?

The emissive texture itself is usually authored in sRGB like a colour map, but the emissive output is scaled by an intensity value that can go well above 1.0 (HDR) to drive bloom and a convincing glow. So the map holds the colour and shape; the material's emissive intensity controls how brightly it burns.

How do you make an emissive map?

Paint the glowing areas in colour on a black background — black means no emission, bright means full glow. You can mask it from the base colour (the neon tubes, the screen, the lava veins) and tint it. Tools like CraftPBR can include an emissive channel in a generated set for surfaces that glow.

Where are emissive maps used?

Anywhere a surface produces light: computer and phone screens, neon and LED signs, sci-fi panels and holograms, lava and magma, glowing runes and magic, car tail lights, and any hot or radioactive material. They are essential for sci-fi, cyberpunk, and fantasy scenes.

Next guide

What Is an Albedo Map? →