public Entity CreateSpline(SplineElement[] elements, float avgSpeed = 1)
{
Entity entity = EntityManager.CreateEntity(typeof(SplineElement), typeof(SplineSegment));
var elementBuffer = EntityManager.GetBuffer <SplineElement>(entity);
var segmentBuffer = EntityManager.GetBuffer <SplineSegment>(entity);
for (int i = 0; i < elements.Length; ++i)
{
elementBuffer.Add(elements[i]);
SplineElement start = elements[i];
SplineElement end = i < elements.Length - 1 ? elements[i + 1] : elements[0];
float length = Bezier.GetLength(start.point, start.point + start.forward, end.point + end.backward, end.point, 20);
int segments = 1 + (int)(length * 10f / avgSpeed);
for (int j = 0; j < segments; ++j)
{
float[] steps = new float[] {
(j) / (float)segments,
(j + .33333333f) / (float)segments,
(j + .66666666f) / (float)segments,
(j + 1) / (float)segments,
};
segmentBuffer.Add(new SplineSegment {
start = (j) / (float)segments,
end = (j + 1) / (float)segments,
length = Bezier.GetLength(start.point, start.point + start.forward, end.point + end.backward, end.point, steps),
});
}
}
return(entity);
}
public void Execute(ArchetypeChunk chunk, int index, int entityOffset)
{
var localToParentAcessor = chunk.GetNativeArray(localToParentType);
var animationAcessor = chunk.GetNativeArray(splineAnimationType);
var justSpawnedAcessor = default(NativeArray <JustSpawned>);
if (chunk.Has(justSpawnedType))
{
justSpawnedAcessor = chunk.GetNativeArray(justSpawnedType);
}
for (int i = 0; i < chunk.Count; i++)
{
SplineAnimationSpeed anim = animationAcessor[i];
var elements = elementAcessor[anim.spline];
var segments = segmentAcessor[anim.spline];
if (anim.index >= elements.Length)
{
continue;
}
float move = anim.speed * deltaTime;
if (justSpawnedAcessor.IsCreated)
{
move = anim.speed * justSpawnedAcessor[i].deltaTime;
}
float left;
SplineSegment segment = segments[anim.segIndex];
while (move >= (left = (segment.end - anim.t) / (segment.end - segment.start) * segment.length))
{
move -= left;
if (++anim.segIndex >= segments.Length || segments[anim.segIndex].start == 0)
{
if (anim.isLoop)
{
if (++anim.index >= elements.Length)
{
anim.index = 0;
anim.segIndex = 0;
}
}
else
{
if (++anim.index >= elements.Length - 1)
{
anim.index = elements.Length;
anim.segIndex = 0;
anim.t = 0;
break;
}
}
}
segment = segments[anim.segIndex];
anim.t = segment.start;
}
if (anim.index >= elements.Length)
{
SplineElement last = elements[elements.Length - 1];
localToParentAcessor[i] = new LocalToParent {
Value = math.float4x4(last.rotation, last.point)
};
}
else
{
anim.t += (move / segment.length) * (segment.end - segment.start);
SplineElement start = elements[anim.index];
SplineElement end = anim.index < elements.Length - 1 ? elements[anim.index + 1] : elements[0];
float3 position = Bezier.GetPoint(start.point, start.point + start.forward, end.point + end.backward, end.point, anim.t);
quaternion rotation = math.nlerp(start.rotation, end.rotation, anim.t);
localToParentAcessor[i] = new LocalToParent {
Value = math.float4x4(rotation, position)
};
}
animationAcessor[i] = anim;
}
}
