RS2:317:Construct map region

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Construct map region
Constructs a new map region from a palette of 8x8 tiles.
Opcode 241
Type Variable Short
Length N/A

Construct Map Region


The construct map region packet sends a dynamic map region that is constructed by using groups of 8*8 tiles. It is generally used for instanced areas, such as fight caves, and in later revisions, player owned houses.

Packet Structure

Data type Description
Short Special A The region Y coordinate (absolute Y coordinate / 8), plus 6.
Bit block See below.
Short The region X coordinate (absolute X coordinate / 8), plus 6.

Bit block

The bit block actually contains the 'palette' of map regions to make up the new region.

There is a loop, like this, used to construct it:

for(int z = 0; z < 4; z++) {
 for(int x = 0; x < 13; x++) {
  for(int y = 0; y < 13; y++) {
   // data for this region

The individual format in each iteration of the loop is:

  • 1 bit - set to 0 to indicate to display nothing, 1 to display a region
  • 26 bits - if the flag above is set to 1 - region x << 14 | region y << 3