Laser Graffiti — Control

Starting…

show advanced options

1 · Camera

show detection mask

2 · Projector

Move it to the projector and press F there for fullscreen.

3 · Calibration

Projector: flashes markers into the corners; drag the yellow corners afterwards to fine-tune. Laser: after a 3 s countdown (shown on the projector), wave the laser around inside the projection for 4 s — thresholds and dot size are learned from it.

4 · Detection Laser color

Thresholds are set by Calibrate laser; tick show advanced options to tune them by hand.

Min channel Dominance Min pixels Max pixels Position smoothing Tracking radius also accept saturated white core only inside projection area ignore our own projected strokes (anti feedback loop)

Anti feedback loop: strokes in the laser's colour (incl. the green parts of rainbow) are masked out of the detection, so the projected drawing can't be mistaken for the laser. Shown in blue with show detection mask.

Reflections: the tracker keeps following the blob nearest to the previous position and prefers the brightest one; a new stroke only starts after the dot is seen in 2 consecutive frames.

5 · Drawing

Brush Brush size Line smoothing

Smooths the drawn line itself (moving average + curved segments) — kills the zigzag of a jittery laser track without adding lag. Position smoothing in Detection filters the live position instead.

Fade after (s, 0 = never) Mirror

Menu corner Effect intensity

Scales every effect: how much wet ink drips, how many sparks, how big the flames, how hot and how long the burn glows.

marks

Burn: strokes leave permanent scorch marks — a dim brown, soft-edged discoloured halo around an unlit core; the tip glows white-hot for a moment. Scan surface photographs the wall through the camera (projector blanked) so the halo is textured with the wall itself and the marks look like they are in the material. Needs calibration.

width

Laser menu: hold the laser in the dashed ☰ circle (in the chosen corner of the projection) to open it; hover an item to select. move menu in the menu cycles the corner.

6 · Snapshots

Saves the camera photo and the drawing to this browser. Download the photo, the drawing, or the photo with the drawing overlaid.

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