Skip to content
PostRoll Help

Detection modes

A detection mode is a Foundry-style sense — Sight, Darkvision, Blindsight, Tremorsense, Truesight, or See Invisibility. Each one has its own range and behaves differently. A token can have multiple modes enabled at once, and the engine works out which rules apply.

This is the modern, granular replacement for the older single-Range slider plus Darkvision toggle. If you don’t add any detection modes, the legacy controls still work — see Vision basics.

What each mode does

Section titled “What each mode does”
Mode Pierces walls? Sees through magical darkness? Sees invisibility? Sees through illusions?
Sight No No No No
Darkvision No Yes No No
Blindsight Yes Yes Yes (within range) No
Tremorsense Yes Yes Yes No
Truesight Yes Yes Yes Yes
See Invisibility No No Yes No

Adding a detection mode

Section titled “Adding a detection mode”
  1. Open the token’s Settings dialog → Vision section.
  2. Scroll to the Detection Modes subsection (under the Hard Edge Light / Edge softness controls).
  3. Click the + Add mode dropdown and pick the mode you want.
  4. The new mode appears in a list, enabled by default with a copy of the legacy Range value.

Each entry in the list has:

  • An enable / disable switch (so you can keep a mode on the token but turn it off temporarily).
  • A range slider (0..5000 px) — how far that sense reaches.
  • A Remove link.

How range interacts

Section titled “How range interacts”

When any detection mode is enabled, the legacy “Range” slider above is ignored. The token’s effective vision radius becomes the maximum range across enabled modes.

So a token with:

  • Sight at range 1500
  • Darkvision at range 3000
  • Blindsight at range 300

…sees out to 3000 px (darkvision wins as the longest range), pierces darkness everywhere within that range (because darkvision is enabled), and pierces walls within 300 px (because blindsight is enabled).

If you toggle every mode off, the token falls back to the legacy Range and Darkvision controls above. Same if you remove all modes.

When does each mode visibly do anything?

Section titled “When does each mode visibly do anything?”

A common gotcha — adding a mode might not seem to have any visible effect because each mode only matters under certain scene conditions:

Mode You’ll see a difference when
Sight The mode’s range differs from the legacy Range.
Darkvision The scene has ambient darkness (Darkness > 0 in Scene Lighting). Without darkness, there’s nothing to see “through”.
Blindsight, Tremorsense, Truesight There are walls between the token and what it should see. Without walls, there’s nothing to bypass.
See Invisibility, Truesight Invisible-tagged tokens exist. (Currently the invisibility tag is not yet visually rendered — see the caution above.)

If you add Blindsight expecting to see through walls and notice no change, check that there are walls between the token and the area you’d expect to be revealed.

Quick recipes

Section titled “Quick recipes”
Creature Detection modes
Human commoner Sight 1500
Elf Sight 1500, Darkvision 1800
Dwarf Sight 1500, Darkvision 1500
Mole / mole rat Sight 100, Tremorsense 1000
Bat Blindsight 1500
Beholder Sight 3000, Truesight 3000
Faerie at night Sight 800, See Invisibility 1500
Section titled “Related”