Latest revision as of 18:24, 17 September 2012

For those familiar with TS1 modding, there is nothing new here. This page is designed primarily for the newcomer who does not have any previous experience with SimAntics.

[edit] Overview

This is by far the most used BHAV operation and, therefore, one of the first an aspiring behavioral modder should learn. At its heart, Expression is a fairly simple instruction, taking two items and performing a logical comparison or mathematical calculation with them.

[edit] Structure

The structure (with the exception of the as yet unknown bytes) is also fairly simple. We will use the following example instruction to explore the structure further:

aa, aa, bb, bb, ??, oo, AA, BB
xx, xx, xx, xx, xx, xx, xx, xx

Example:

00, 00, 00, 00, 00, 05, 19, 09
00, 00, 00, 00, 00, 00, 00, 00 

xx

unused

oo

the Operator, which tells the game which mathematical/logical operation to perform

AA

the first (or left-side) Operand

aa

argument for the first operand

BB

the second (or right-side) Operand

bb

argument for the second Operand

??

was never completely understood in TS1. Either it is some type of flag or is unused.

So in our example instruction:

• the Operator is 0x05 (assign to)
• the first Operand is 0x19 (local variable)
• which has an argument of 0x00 (numeric 0)
• the second Operand is 0x09 (parameter)
• which has an argument of 0x00 (numeric 0)

Our instruction would therefore be read as "local variable 0x0 := parameter 0x0". In simpler terms, this means "the value for local variable 0x0 := the value listed in parameter 0x0"

[edit] See also

• Primitives
• SimAntics

This article is imported from the old MTS2 wiki. It's original page, with comments, can be found at http://old_wiki.modthesims2.com/0x0002