Discussion:Field of Vision

Half-width walls, center to center

Suggested by PowerDiver.

This is a symmetrical system.

Consequences:

################D
@

Fig 1. @ can see D, D can see @

##D
##
@

Fig 2. Indeterminate (probably resolve to not visible).

#m
#
@#

Fig 3. Vital that @ can see m in this case.

......................
.@#                 M
......................

Fig 4. @ cannot see M (by zero-width blockage sub-rule - see fig 2)

.......
.@.....
...#...
..... .
.......

Fig 5. Discontinuous gaps in viewable area (by zero-width blockage)

Monsters occupy half the width/height of grid

Suggested by jv123.

Monsters, characters, items are in the center of their grid's square taking up half the width/height. If lines from any point in the @'s sub-square can go to any point in the M's sub-square without crossing a wall then each is visible by the other. Walls take up the full grid square.

This is a symmetrical system.

Consequences.

#####D######
@

Fig 6. @ cannot see D.

####D#######
@

Fig 7. It is indeterminate whether @ can see D or not (zero-width cross).

###D########
@

Fig 8. @ can see D and D can see @

Center to Center, subdivided grid

Suggested by Marble Dice

Any tile that can have a line drawn from the center of the @ to the center of the tile is without crossing an obstructed point is visible. Each wall takes up the middle 2x2 of the 4x4 sub-divided grid.

For visibility purposes a monster on a wall-tile is not treated differently from a monster on a floor tile.

Consequences.

#######.#######
#######@#######
????.......????
?.............?

Fig 8. From the entrance of a room.

................?
.........????????
.@.###?????M?????
.........????????
................?

Fig 9. @ cannot see M.

@...........
...#?.......
.....????...
.......?????
.........???

Fig 10. Expanding shadow triangle from pillar.

####D
@....

Fig 11. @ cannot see D.

###D#
@....

Fig 12. @ can just see D? (Possibly indeterminate case)

##D##
@....

Fig 13. @ can see D.

See also

Field of Vision