Three-Mirror Reflection Simulator (Top-Down)

Controls

Advanced

Station geometry

Back wall length (in)

Short wall length (in) (perpendicular, at x=0)

Central mirror left edge x (in)

Central mirror width (in)

Desk width (in) (x direction)

Desk depth (in) (y direction)

Desk left edge x (in)

Defaults reflect your notes: central mirror width 23 in on the back wall (y=0), short wall at x=0 extending 11 in outward, and the central mirror left edge 7 in from the short wall.

Ray path mode

Reflection order

0 = Eye → Side → Central → Target (recommended)
1 = Eye → Central → Side → Target
2 = Both orders (a target point counts if either works)

Targets sampled on back-of-head arc (count)

Back-of-head arc width (degrees)

Coverage is the fraction of sampled arc points that are visible via at least one valid reflected path. PASS means coverage ≥ the threshold.

PASS threshold (coverage %)

Left side mirror (pivot wall mirror)

Mount x (in)

Mount y (in)

Reflective width (in)

Yaw angle (deg) (0 = facing +y)

The mirror is a line segment centered at (x,y) with direction set by yaw. Yaw=0 means the mirror plane is vertical in x (segment runs left-right), facing outward (+y).

Right side mirror (pivot mirror on open side)

Mount x (in)

Mount y (in)

Reflective width (in)

Yaw angle (deg) (0 = facing +y)

This side is “open” in your description, so the mirror can be placed freely. If you later add a wall here, you can simulate it by adding another blocking segment in code.

User geometry (top-down)

Head center x (in)

Head center y (in)

Head radius (in)

Eye offset forward (in) (toward mirror, -y)

Facing direction is toward the back wall (negative y). The “back of head” region is on the +y side of the head circle.

Visibility / rendering

Show only a few rays (for clarity)

Wall blocking tolerance (in)

Tolerance helps avoid counting “touching endpoints” as blocked. If you see flicker, increase slightly.

Diagram

Top-down plan view, ideal mirrors

working ray failed ray walls mirrors desk