Object Layer

Overview

Each world cell optionally holds one object, stored in: - Cellule.objectChannel — image channel (CHOBJECT=2 or CHOBJECTo=3) - Cellule.objectIcon — sprite index within the channel

Tall objects (trees, buildings) use two channels: - CHOBJECT (2) — lower part of the object (overlays the cell's floor) - CHOBJECTo (3) — upper part (overlays the cell one row higher in screen space)

A value of objectIcon == -1 means no object is present.

Object Categories (obj000.blp)

Channel System

During rendering, objectChannel of a cell is interpreted as:

if (objectChannel == CHOBJECT) {
    // Draw lower part of object (icon objectIcon)
    // at the position of this cell
}
if (objectChannel == CHOBJECTo) {
    // Draw object as overlay
    // (for tall objects overlapping cells above)
}

The upper overlay channel (obj-o*.blp) contains icons aligned to visually connect with corresponding icons in obj*.blp.

Placing and Reading Objects

BOOL CDecor::PutObject(POINT cel, int channel, int icon)
// Places an object on cell cel
// channel = CHOBJECT or CHOBJECTo
// icon = sprite index

BOOL CDecor::GetObject(POINT cel, int &channel, int &icon)
// Reads the object from a cell
// Returns FALSE if the cell has no object (icon == -1)

Special Objects — Notes

Fire (Cellule.fire)

Fire intensity is stored directly in Cellule.fire (0–MAXFIRE=400). Fire spreading is controlled by CDecor::MoveFire() and MoveProxiFire() in decmove.cpp.

Hatched Cell (mission target)

Cells with certain icons are marked as "hatched" — mission target cells. CDecor::IsTerminated() checks whether Term conditions are met (correct object or character on the hatched cell).

Teleporter

Teleporters always exist in pairs. The GOAL_TELEPORTE opcode handles transferring Blupi from one teleporter to its partner.

Mine

Mines (BUTTON_FABMINE) are invisible to enemies. The triggering entity is perso=6 (Mine detonator) — an invisible character bound to the mine's position that detonates when triggered.

Bridge

A bridge is a special object that allows Blupi to cross water. CDecor::IsBuildPont() checks whether a bridge can be built. Bridge animation uses the Move system via GOAL_ADDMOVES.

Object Passability Table (obstacle.cpp)

// tableObstacleObject[] — passability of each object icon index
// 0 = passable, 1 = obstacle
// Large objects (trees, buildings) are blocking
// Small decorations (flowers, grass) are passable
static char tableObstacleObject[] = { ... };

Object-related Search Functions