Source: https://spring.clan-sy.com/svn/spring/trunk/rts/Sim/Projectiles/ExplosionGenerator.cpp

Contents 1 Introduction 2 Syntax 3 The Buffer 4 Operators 4.1 Index ('i') 4.2 Rand ('r') 4.3 Damage ('d') 4.4 Sawtooth ('m') 4.5 Discrete ('k') 4.6 Sine ('s') 4.7 Yank ('y') 4.8 Multiply ('x') 4.9 Add Buffer ('a') 4.10 Power ('p') 4.11 Power Buffer ('q') 4.12 Add (default) 5 Example

Introduction

You are not limited to using fixed numbers in CEGs for positions, speeds, and so forth. Instead, you can use operators to change the CEG based on a variety of things.

Syntax

Operators are read left to right. The operand is always to the right of the operator. Spaces are ignored, except to separate numbers. A number with no operator defaults to addition.

The Buffer

CEG provides you with a buffer in which you can store numbers using the yank ('y') operator. This buffer can store 16 values, numbered 0 to 15.

Operators

These are listed in the format "Operator Name (operator)".

Index ('i')

Multiplies the operand by the current count index. This index starts at 0 and increments every time the spawn is run, until the spawn has run a number of times equal to its count.

Suggested use: Spawning things in a line.

Rand ('r')

Multiplies the operand by a random float between 0 and 1.

Suggested use: Keeping explosions from looking too "perfect", making explosions look different every time.

Damage ('d')

Multiplies the operand by damage.

CEG_DAMAGE: In a COB script, you can do SET CEG_DAMAGE [value]. Any emit-sfx instructions will then use that value for the "damage" (use the 'd' operator to access this value).

Sawtooth ('m')

Calculates the floating-point remainder of the operand.

Discrete ('k')

Calculates the floor of the operand.

Sine ('s')

Calculates the sine of the operand.

Yank ('y')

Saves the running result into buffer[operand], and resets the running result to zero.

Multiply ('x')

Multiplies the running result by buffer[operand].

Add Buffer ('a')

Adds buffer[operand] to the running result.

Power ('p')

Raises the running result to the operandth power

Power Buffer ('q')

Raises the running result to the buffer[operand]th power.

Add (default)

Adds the operand to the running result. This operator is used if no other operator is given.

Example

i0.03125y0 -0.2x0x0

This multiplies the index by 0.03125 and saves it to buffer[0]. It then multiplies -0.2 by buffer[0] twice. The result is then -0.2 (i * 0.03125)^2. This type of thing is useful for making a series of particles follow a curved path.

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