Heatcloud

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Introduction

heatcloud is one of the simplest and most common explosion types. Ironically, it is also one of the least intuitive. First of all, ignore the name--it basically makes an expanding image at the point at which it is spawned.

Source

rts/Sim/Projectiles/Unsynced/HeatCloudProjectile.cpp

Suggested Use

heatcloud makes a good main piece of an explosion. Think of it as a background for the other components of your explosion generator.

Parameters

heat, maxheat, heatFalloff

Most explosions have alpha and ttl. I don't know why heatcloud uses these instead. Basically:

Starting alpha = heat / maxheat

ttl = heat / heatFalloff

The alpha decreases linearly across the heatcloud's lifetime.

size, sizeGrowth

The heatcloud starts at size size and grows sizeGrowth each frame.

sizemod, sizemodmod

It seems that the heatcloud expands by a factor of (1 - sizemod) each frame. The sizemod itself is multiplied by sizemodmod every frame. Most of the time it's probably best just not to contemplate these.

texture

The texture of the heatcloud.