EvilEngine/PARP
< EvilEngine(Redirected from PARP)
PARP | |
---|---|
Particle Emitter Property | |
Type | Base |
Base Type | 0x2E |
Games used | Battle for Bikini Bottom The SpongeBob SquarePants Movie |
Source code | xParEmitter.h |
A Particle Emitter Property asset contains settings for particles created by a Particle Emitter.
Format
A Particle Emitter Property asset describes how a particle changes over its lifetime, such as its color, size, and velocity. Each of these properties are defined by an xParInterp struct:
struct xParInterp
{
float val[2];
unsigned int interp;
float freq;
float oofreq;
};
- val is an array of 2 floats. The 1st float is the start value of the interpolation, and the 2nd float is the end value.
- interp is the interpolation mode, which determines how the current value of the interpolation is computed over time:
- ConstA (0 or 0x48e48e7a) - Always the start value.
- ConstB (1 or 0x48e48e7b) - Always the end value.
- Random (2 or 0x0fe111bf) - A new random value between the start and end value, refreshed every freq seconds.
- Linear (3 or 0xb7353b79) - A value between the start and end value, found by using linear interpolation.
- Sine (4 or 0x0b326f01) - A value between the start and end value, found by using sine interpolation.
- Cosine (5 or 0x498d7119) - A value between the start and end value, found by using cosine interpolation.
- Time (unused, 6) - The current time of the interpolation.
- Step (7 or 0x0b354bd4) - The start value until time*freq >= 0.5, then the end value.
- freq is the frequency of the interpolation when using Random, Linear, or Step mode.
- oofreq is the frequency of the interpolation when using Sine or Cosine mode.
The actual asset is defined by an xParEmitterPropsAsset struct, which inherits xBaseAsset (Object Asset):
struct xParEmitterPropsAsset : xBaseAsset
{
unsigned int parSysID;
// This union is so that you can either access each xParInterp individually,
// or as an "array" of xParInterps
// value is length 1 but you'd access it as if it were a length 14 array
// (rate is index 0, life is index 1, etc... vel_angle is index 13)
union
{
xParInterp rate;
xParInterp value[1];
};
xParInterp life;
xParInterp size_birth;
xParInterp size_death;
xParInterp color_birth[4];
xParInterp color_death[4];
xParInterp vel_scale;
xParInterp vel_angle;
xVec3 vel;
unsigned int emit_limit;
float emit_limit_reset_time;
};
- parSysID is the ID of the Particle System that the Particle Emitter should use.
- rate is how many times per second a particle is emitted.
- life is the lifetime in seconds of a particle.
- size_birth is the start size in units of a particle.
- size_death is the end size in units of a particle.
- color_birth is the start color of a particle (red, green, blue, and alpha).
- color_death is the end color of a particle (red, green, blue, and alpha).
- vel_scale is unknown/unused (all set to 0).
- vel_angle is unknown/unused (all set to 0).
- vel is unknown/unused (all set to 0).
- emit_limit is always -1.
- emit_limit_reset_time is unknown (usually set to 0 but sometimes not).
At the end of the xParEmitterPropsAsset is a list of Links.
Events
Particle Emitter Property has no events.