public static ValueTransform lerp(ValueTransform start, ValueTransform end, float factor)
{
return(new ValueTransform(
Vector3.LerpUnclamped(start.position, end.position, factor),
Quaternion.LerpUnclamped(start.rotation, end.rotation, factor)
));
}
public void ShrinkToLength(float targetLength) {
// Base mesh
{
// How many rings to remove
float headPatchLength = GetPatchLength(headPatch);
int targetRings = (int)((targetLength - headPatchLength) / interval) + 1;
// Leave at least one ring
targetRings = Mathf.Max(targetRings, 1);
while (snakeMesh.Count > targetRings)
snakeMesh.PopFromStart();
}
// Tail position
{
float tailPatchLength = targetLength - GetPatchLength(headPatch) - baseLength;
float factor = tailPatchLength / interval;
ValueTransform tailRing = ValueTransform.lerp(snakeMesh.Kernel.Path[0], lastPoppedRing, factor);
tailRing.SetTransform(tail);
UpdateTailPatch(tailRing);
// UV offset
float distanceTraveled = baseDistanceTraveled - baseLength - tailPatchLength;
baseTailOffset = tailMaterial.GetUnscaledTextureOffset();
baseTailOffset.y = distanceTraveled / snakeMesh.RingLength;
tailMaterial.SetUnscaledTextureOffset(baseTailOffset);
}
}
public void PushToEnd(ValueTransform ring, float distanceTraveled)
{
kernel.PushToEnd(ring);
// Vertices and normals
for (int i = 0; i < RealPointsPerRing; ++i)
{
float angle = (2 * Mathf.PI) * i / visiblePointsPerRing;
var normal = new Vector3(Mathf.Cos(angle), Mathf.Sin(angle));
normal = ring.rotation * normal;
Vector3 vertex = normal * radius + ring.position;
Vector2 uv = new Vector2();
uv.x = 0.75f - (float)i / visiblePointsPerRing;
uv.y = distanceTraveled / RingLength;
vertices.Enqueue(vertex);
normals.Enqueue(normal);
uvs.Enqueue(uv);
#if UNITY_EDITOR
UpdateVertexDebugInfo(vertices.Count - 1);
#endif
}
AddSegmentTriangles();
meshIsDirty = true;
}
public void Init() {
snakeMesh = snakeMesh_ as ISnakeMesh;
Assert.IsNotNull(snakeMesh);
headPatch = InitPatch("Head Patch");
tailPatch = InitPatch("Tail Patch");
tailMaterial = tail.GetChild(0).GetRequiredComponent<MeshRenderer>().material;
// Add first ring
// TODO: replace by more sane mechanism (incorrect ring here)
{
ValueTransform ring = new ValueTransform(tail);
GrowBaseMesh(ring, true);
lastPoppedRing = ring;
float distanceTraveled = 0;
headPatch.PushToEnd(ring, distanceTraveled);
headPatch.PushToEnd(ring, distanceTraveled);
tailPatch.PushToEnd(ring, distanceTraveled);
tailPatch.PushToEnd(ring, distanceTraveled);
}
snakeMesh.Kernel.OnPopFromStart += (ring) => {
lastPoppedRing = ring;
};
}
// TODO: remove duplicate code in UpdateHeadPatch() and UpdateTailPatch()
private void UpdateHeadPatch(ValueTransform headRing) {
headPatch.PopFromStart();
headPatch.PopFromStart();
ValueTransform baseRing = snakeMesh.Kernel.Path.Last;
float patchLength = (headRing.position - baseRing.position).magnitude;
headPatch.PushToEnd(baseRing, baseDistanceTraveled);
headPatch.PushToEnd(headRing, baseDistanceTraveled + patchLength);
}
private void UpdateTailPatch(ValueTransform tailRing) {
tailPatch.PopFromStart();
tailPatch.PopFromStart();
ValueTransform baseRing = snakeMesh.Kernel.Path[0];
float baseDistance = baseDistanceTraveled - baseLength;
float tailPatchLength = (tailRing.position - baseRing.position).magnitude;
tailPatch.PushToEnd(tailRing, baseDistance - tailPatchLength);
tailPatch.PushToEnd(baseRing, baseDistance);
}
// Grows base mesh if needed in current frame.
//
// TODO: remove "force" argument
private void GrowBaseMesh(ValueTransform ring, bool force = false) {
Vector3 lastGrowPoint;
if (force)
lastGrowPoint = ring.position;
else
lastGrowPoint = snakeMesh.Kernel.Path.Last.position;
Vector3 delta = ring.position - lastGrowPoint;
if (delta.magnitude >= interval || force) {
// Grow
//lastGrowPoint += delta.normalized * interval;
float distanceTraveled = baseDistanceTraveled + interval;
snakeMesh.PushToEnd(ring, distanceTraveled);
}
}
public void Grow(ValueTransform value, bool force = false)
{
// TEST; TODO: remove
float distance = 0;
if (intPath.Size == 0)
{
force = true;
}
else
{
distance = (value.position - intPath.Last.position).magnitude;
}
if (force || distance >= interval)
{
intPath.PushToEnd(value);
}
}
public void PopFromStart()
{
ValueTransform popped = Path.Dequeue();
OnPopFromStart?.Invoke(popped);
}
public void PushToEnd(ValueTransform dest)
{
Path.Enqueue(dest);
RingsAdded++;
}
public void Grow(ValueTransform ring) {
GrowBaseMesh(ring);
UpdateHeadPatch(ring);
}