Engine.TrailEmitter

//=============================================================================
// Emitter: An Unreal Trail Particle Emitter.
//	Revision history:
//		* Created by Daniel Vogel
//		* Updated by Laurent Delayen
//=============================================================================

class TrailEmitter extends ParticleEmitter
    native;

struct ParticleTrailData
{
    var vector  Location;
    var color   Color;
    var float   Size;
    var int     DoubleDummy1;
    var int     DoubleDummy2;
};

struct ParticleTrailInfo
{
    var int     TrailIndex;
    var int     NumPoints;
    var vector  LastLocation;                   // last point location (to compute new points)
    var vector  LastEmitterLocation;            // Laurent -- Last Emitter Location, to process point interpolation
};

enum ETrailShadeType
{
    PTTST_None,             // Full particle color
    PTTST_RandomStatic,     // particle color * random opacity set once
    PTTST_RandomDynamic,    // particle color * random opacity, updated every tick
    PTTST_Linear,           // smooth linear fade out (begining = 100%, end = 0%)
    PTTST_PointLife         // linear fade relative to point's life
};

enum ETrailLocation
{
    PTTL_AttachedToParticle,    // Attached to Particle
    PTTL_FollowEmitter          // Attached to Particle, with added emitter's velocity
};

var (Trail)         ETrailShadeType             TrailShadeType;         // Shading effect on trail
var (Trail)         ETrailLocation              TrailLocation;          // Trail Attachment

var (Trail)         int                         MaxPointsPerTrail;
var (Trail)         float                       DistanceThreshold;
var (Trail)         bool                        UseCrossedSheets;
var (Trail)         int                         MaxTrailTwistAngle;
var (Trail)         float                       PointLifeTime;          // 0.f for unlimited

var transient       array<ParticleTrailData>    TrailData;
var transient       array<ParticleTrailInfo>    TrailInfo;
var transient       vertexbuffer                VertexBuffer;
var transient       indexbuffer                 IndexBuffer;
var transient       int                         VerticesPerParticle;
var transient       int                         IndicesPerParticle;
var transient       int                         PrimitivesPerParticle;

native final function ResetTrail();

defaultproperties
{
     MaxPointsPerTrail=30
     DistanceThreshold=2.000000
     MaxTrailTwistAngle=16384
}