Flags

Flags switch behaviors the game reads from your interior. Each kind lives in the section of the thing it belongs to.

Flags on	Where to set them
A prop	Select the prop > Flags (…)
The interior	Select the part row in the tree > Part
A room	The room’s Flags (…) section. See Rooms.
A portal	The portal’s Flags (…) section. See Portals and openings.
Faces (collision)	Material > Collision > Collision flags. See Geometry.

Prop flags

The Flags list and the Value field edit the same number. The list rewrites only the bits it names; Value accepts a whole number in decimal or hex (0x…), from 0 to 4294967295. New props start at 1572864 (0x180000), which is Cast Static Shadows and Cast Dynamic Shadows.

Flags section for a prop with the Flags list open and a Value of 1572864 — The prop Flags list open.

Flags with a hint in the app:

Flag	What it does
Disable Embedded Collisions	Turns off the drawable’s built-in collision. Stairs and facades inherited from a vanilla ymap end up without collision.
Cast Static Shadows, Cast Dynamic Shadows	Together, the default of vanilla interior props.

The rest are named after what they do, and are grouped here:

Rendering and LOD: Allow Full Rotation, Stream Low Priority, LOD In Parent Map, LOD Adopt Me, Static Entity, Interior LOD, LOD Use Alt Fade, Ignore Time Settings.
Water and peds: Underwater, Doesn’t Touch Water, Doesn’t Spawn Peds.
Shadows and reflections: Don’t Render Shadows, Only Render Shadows, Don’t Render Reflections, Only Render Reflections, Don’t Render Water Reflections, Only Render Water Reflections, Don’t Render Mirror Reflections, Only Render Mirror Reflections.

Some bits have no name. Only the raw Value field reaches them.

Interior (Part) flags

Select the part row in the tree. Part places the interior in the world and sets its draw distances.

Option	What it does	Default
Position (m), Rotation (°)	Where the interior sits in the world.
lodDist	At what distance, in meters, the game stops drawing the part.	500
hdTextureDist	Up to what distance, in meters, the game uses high-resolution textures.	100
Subway, Office, Allow Run, Cutscene Only, LOD When Locked, No Water Reflection, Has Low LOD Portals	Interior flags.	Off
Placement flags	The same list as prop flags, for the interior’s own placement in the ymap. Zero comes out as `0x180000`, the value of DLC placements.
Archetype flags, MLOInstflags	Raw numbers, decimal or `0x…`.	0
See all parts	Draws all parts uncut on the map. Needs two or more parts.	Off
Timecycle modifiers (N)	A separate section below Part, shown only when the part has rooms. Each modifier has a Name picked from the game’s list, Minimum (m), Maximum (m), percentage, range, startHour, and endHour. Add modifier adds one; Delete the modifier removes it.

Room flags

Flag	What it does
Freeze Vehicles, Freeze Peds	Vehicles or pedestrians inside the room do not simulate.
No Directional Light	The sun does not enter the room.
No Exterior Lights	World lights outside do not light up the room.
Reduce Cars, Reduce Peds	Fewer vehicles or pedestrians spawn while you are in the room.
Dont Render Exterior	The world outside is not drawn while the eye is in the room.

Also available: Force Freeze, Force Directional Light On, Mirror Potentially Visible.

Portal flags

Flag	What it does
One Way	Passes in one direction only: the portal’s direction, from inside to outside.
Mirror	The portal is a mirror, not a passage.

Also available: Link Interiors Together, Disable Timecycle Modifier, Mirror Using Expensive Shaders, Low LOD Only, Hide when door closed, Mirror Can See Directional, Mirror Using Portal Traversal, Mirror Floor, Mirror Can See Exterior View, Water Surface, Water Surface Extend To Horizon, Use Light Bleed.

Merge exteriors

When you select two or more rooms of a drawn structure, Selected rooms appears with Merge exteriors. It merges the outer walls of those rooms into one outer skin. Groups already merged are expanded, and turning it off removes the selected rooms from the group. Portals stay manual. Each selected room needs its Exterior switch on first; otherwise Merge exteriors is disabled with “Turn on the exterior of all selected rooms to merge.” The section does not appear for an interior imported from the game.

Turn Exterior on

Turn on Exterior in each room. See Rooms.

Select the rooms

Shift+click two or more rooms.

Turn on Merge exteriors

Turn it on in Selected rooms. To split them again, select the rooms and turn it off.

Troubleshooting

Turn on the exterior of all selected rooms to merge.

Merge exteriors is disabled. Turn on Exterior in every selected room.

Accepts a whole number in decimal or hex (0x…), from 0 to 4294967295.

The Value field rejected your text. Enter a whole number or a 0x… hex value in range.

lodDist … m is smaller than the interior radius (… m).

This is a warning. Raise lodDist on the part so the interior is not cut off at a distance.

Projects

Texturing

Structures

Props

Emergency vehicles

Prop flags

Interior (Part) flags

Room flags

Portal flags

Merge exteriors

Troubleshooting

​Prop flags

​Interior (Part) flags

​Room flags

​Portal flags

​Merge exteriors

​Troubleshooting

Prop flags

Interior (Part) flags

Room flags

Portal flags

Merge exteriors

Troubleshooting