Where it comes from
Three-dimensional lettering entered graffiti from signwriting and comic lettering, where a block shadow behind a flat shape was already the standard way to give a letter weight. On a wall the effect is stronger than on paper, because the surrounding surface is genuinely flat — there is no screen or paper edge to remind the eye that nothing is really sticking out.
The style is unusual among graffiti families in that it is not a letterform at all. It is a treatment. Any skeleton — bubble, blockbuster, handstyle, wildstyle — can be extruded, and the alphabet underneath stays whatever it was.
How it is built
Choose one light direction and never change it
Every extrusion, every shadow and every highlight in the piece points the same way. This is the single rule. One letter lit from a different angle breaks the illusion for the whole word.
Project every point of the outline by the same vector
In a simple block shadow, each point of the letter moves by the same distance and angle. Draw it by copying the outline, offsetting it, and joining the outer edges.
Join the outline to the shadow
The connecting edges between the flat letter and the offset copy are the visible sides of the extrusion. They need to be closed and filled, or the letter looks like two shapes floating apart.
Or use a vanishing point
For a deeper, more architectural look, project each point toward a single vanishing point instead of by a fixed offset. The letter then appears to lean away into space, and the extrusions visibly converge.
Terms you will meet
- Extrusion
- The side surface created by projecting a shape along a direction — the "thickness" of the letter.
- Drop shadow
- A flat offset copy of the letter, used behind it. Simpler than a true extrusion because the sides are not drawn.
- Vanishing point
- The point where parallel lines appear to converge, used to make extrusions converge for a perspective effect.
- Block shadow
- Another name for the simple fixed-offset extrusion used in most 3D graffiti lettering.
- Front face
- The original flat letter. It is the only part that is not distorted by the projection.
Where it goes wrong
- Mixed light directions — The most common and the most damaging error. Two letters in the same word extruded in different directions make the piece look like a mistake rather than a style.
- Extrusion too deep — A shadow longer than roughly half the letter height stops reading as depth and starts reading as a second, uglier letter.
- Not closing the sides — If the offset copy is floating behind the letter with no connecting edges, the effect is a drop shadow, not an extrusion. Both are valid — but pick one.
- Forgetting the outline — A dark outline around the front face is what separates the flat letter from its own shadow. Without it, the two merge into one thick shape.
Try it in the generator
Three of the fifteen styles in the studio belong to this family. Each is a different skeleton of the alphabet, so the same word resolves differently in each one.