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Add utility to make spline curve linear or smooth

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This commit is contained in:
Wojtek Figat
2021-01-26 09:32:41 +01:00
parent fe78fa7575
commit 023cdced0a
5 changed files with 206 additions and 20 deletions
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61
Source/Engine/Level/Actors/Spline.cpp
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@@ -154,8 +154,6 @@ float Spline::GetSplineTimeClosestToPoint(const Vector3& point) const
float bestTime = 0.0f;
for (int32 i = 1; i < pointsCount; i++)
FindTimeClosestToPoint(localPoint, Curve[i - 1], Curve[i], bestDistanceSquared, bestTime);
if (_loop)
FindTimeClosestToPoint(localPoint, Curve[pointsCount - 1], Curve[0], bestDistanceSquared, bestTime);
return bestTime;
}
@@ -228,8 +226,61 @@ void Spline::AddSplineLocalPoint(const Transform& point, bool updateSpline)
UpdateSpline();
}
void Spline::SetTangentsLinear()
{
const int32 count = Curve.GetKeyframes().Count();
if (count < 2)
return;
if (_loop)
Curve[count - 1].Value = Curve[0].Value;
for (int32 i = 0; i < count; i++)
{
auto& k = Curve[i];
k.TangentIn = k.TangentOut = Transform::Identity;
}
UpdateSpline();
}
void Spline::SetTangentsSmooth()
{
const int32 count = Curve.GetKeyframes().Count();
if (count < 2)
return;
auto& keys = Curve.GetKeyframes();
const int32 last = count - 2;
if (_loop)
Curve[count - 1].Value = Curve[0].Value;
for (int32 i = 0; i <= last; i++)
{
auto& key = keys[i];
const auto& prevKey = keys[i == 0 ? (_loop ? last : 0) : i - 1];
const auto& nextKey = keys[i == last ? (_loop ? 0 : last) : i + 1];
const float prevTime = _loop && i == 0 ? key.Time : prevKey.Time;
const float nextTime = _loop && i == last ? key.Time : nextKey.Time;
const Vector3 slope = key.Value.Translation - prevKey.Value.Translation + nextKey.Value.Translation - key.Value.Translation;
const Vector3 tangent = slope / Math::Max(nextTime - prevTime, ZeroTolerance);
key.TangentIn.Translation = -tangent;
key.TangentOut.Translation = tangent;
}
UpdateSpline();
}
void Spline::UpdateSpline()
{
// Always keep last point in the loop
const int32 count = Curve.GetKeyframes().Count();
if (_loop && count > 1)
{
auto& first = Curve[0];
auto& last = Curve[count - 1];
last.Value = first.Value;
last.TangentIn = first.TangentIn;
last.TangentOut = first.TangentOut;
}
}
void Spline::GetKeyframes(MonoArray* data)
@@ -256,9 +307,9 @@ namespace
const auto& startKey = spline->Curve[start];
const auto& endKey = spline->Curve[end];
const Vector3 startPos = transform.LocalToWorld(startKey.Value.Translation);
const Vector3 startTangent = transform.LocalToWorld(startKey.TangentOut.Translation);
const Vector3& startTangent = startKey.TangentOut.Translation;
const Vector3 endPos = transform.LocalToWorld(endKey.Value.Translation);
const Vector3 endTangent = transform.LocalToWorld(endKey.TangentIn.Translation);
const Vector3& endTangent = endKey.TangentIn.Translation;
const float d = (endKey.Time - startKey.Time) / 3.0f;
DEBUG_DRAW_BEZIER(startPos, startPos + startTangent * d, endPos + endTangent * d, endPos, color, 0.0f, depthTest);
}
@@ -273,8 +324,6 @@ namespace
if (i != 0)
DrawSegment(spline, i - 1, i, color, transform, depthTest);
}
if (spline->GetIsLoop() && count > 1)
DrawSegment(spline, count - 1, 0, color, transform, depthTest);
}
}