c4bd6e153e
SimClock (engine-free) turns real frame seconds into whole fixed steps; ActionGameManager.Update feeds it outside the pause gate and Zone.Update(Time.deltaTime) is gone, with IntroCutscene (dead, Unity-driven pose writes). Entity.TurnRate is the sum of the rotation actuators' applied turn per sim second, zeroed each Update; DrawAhead reads it so EntityInstance and ShipInstance draw the latest sim state ahead by Lead. Unverified at this commit. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
36 lines
1.7 KiB
C#
36 lines
1.7 KiB
C#
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
|
|
|
|
using CultMath;
|
|
using static CultMath.math;
|
|
|
|
// Where a presenter draws the latest sim state when the frame falls Lead sim seconds after the last step. Pure reads
|
|
// of the simulation for presenters (never called by ServerShared): the sim owns every pose and no presenter stores
|
|
// one, a previous state or a velocity of its own.
|
|
public static class DrawAhead
|
|
{
|
|
public static float3 Position(Entity entity, float lead) =>
|
|
entity.Position + float3(entity.Velocity.x, 0, entity.Velocity.y) * lead;
|
|
|
|
// The ship's rotation turned about its own up axis by the rate its last step turned, for lead seconds.
|
|
public static quaternion Rotation(Ship ship, float lead)
|
|
{
|
|
var q = ship.Rotation;
|
|
var u = float3(q.x, q.y, q.z);
|
|
var up = float3(0, 1, 0);
|
|
up += 2 * (q.w * cross(u, up) + cross(u, cross(u, up)));
|
|
var half = -ship.TurnRate * lead * .5f;
|
|
var s = sin(half);
|
|
var t = new quaternion(up.x * s, up.y * s, up.z * s, cos(half));
|
|
// Hamilton product t * q: CultMath carries no quaternion product (a gap in CultMath, not filled here).
|
|
return normalize(new quaternion(
|
|
t.w * q.x + t.x * q.w + t.y * q.z - t.z * q.y,
|
|
t.w * q.y - t.x * q.z + t.y * q.w + t.z * q.x,
|
|
t.w * q.z + t.x * q.y - t.y * q.x + t.z * q.w,
|
|
t.w * q.w - t.x * q.x - t.y * q.y - t.z * q.z));
|
|
}
|
|
|
|
// Zone time for a presenter that evaluates a sim function of time (FireControl.RoundAt).
|
|
public static float Time(Zone zone, float lead) => zone.Time + lead;
|
|
}
|