public GPUParticle[] Emit(EmitShapeType shape, Vector3 centerPos, float size)
{
deltaTime += Time.deltaTime * count;
int intDelta = (int)deltaTime;
deltaTime -= intDelta;
if (intDelta == 0)
{
return(null);
}
var particles = new GPUParticle[intDelta];
for (int i = 0; i < particles.Length; i++)
{
particles[i].pos = centerPos + GetPoint(shape, size);
particles[i].velocity = velocity;
particles[i].lifeTime = lifeTime;
}
return(particles);
}
private Vector3 GetPoint(EmitShapeType shape, float size)
{
Vector3 pos = Vector3.one;
switch (shape)
{
case EmitShapeType.Ring:
float angle = Random.Range(0.0f, Mathf.PI * 2.0f);
var x = Mathf.Cos(angle) * size;
var y = Mathf.Sin(angle) * size;
pos = new Vector3(x, y, 0);
break;
case EmitShapeType.Circle:
pos = Random.insideUnitCircle * size;
break;
default:
break;
}
return(pos);
}
