public SSpaceMissileClusterVisualData(
            Matrix4 launcherWorldMat, Vector3 launcherVel, int numMissiles,
            ISSpaceMissileTarget target, float timeToHit,
            SSpaceMissileVisualParameters mParams,
            Vector3[] meshPositioningOffsets = null,
            Vector3[] meshPositioningDirections = null,
            BodiesFieldGenerator meshPositioningGenerator = null,
            SSpaceMissileVisualData.AtTargetFunc atTargetFunc = null)
        {
            _target = target;
            _timeToHit = timeToHit;
            _parameters = mParams;
            _missiles = new SSpaceMissileVisualData[numMissiles];
            this.atTargetFunc = atTargetFunc;

            Vector3[] localSpawnPts = new Vector3[numMissiles];
            Quaternion[] localSpawnOrients = new Quaternion[numMissiles];
            if (meshPositioningGenerator != null) {
                meshPositioningGenerator.Generate(numMissiles,
                    (id, scale, pos, orient) => {
                        localSpawnPts [id] = pos;
                        localSpawnOrients [id] = orient;
                        return true;
                    }
                );
            }

            Quaternion launcherOrientation = launcherWorldMat.ExtractRotation();
            for (int i = 0; i < numMissiles; ++i) {
                if (meshPositioningOffsets != null && meshPositioningOffsets.Length > 0) {
                    localSpawnPts [i] += meshPositioningOffsets [i % meshPositioningOffsets.Length];
                }
                if (meshPositioningDirections != null && meshPositioningDirections.Length > 0) {
                    int idx = i % meshPositioningDirections.Length;
                    localSpawnOrients [i] *= OpenTKHelper.getRotationTo(
                        Vector3.UnitZ, meshPositioningDirections [idx], Vector3.UnitZ);
                }
                Vector3 missileWorldPos = Vector3.Transform(localSpawnPts [i], launcherWorldMat);
                Vector3 missileLocalDir = Vector3.Transform(Vector3.UnitZ, localSpawnOrients [i]);
                Vector3 missileWorldDir = Vector3.Transform(missileLocalDir, launcherOrientation);
                Vector3 missileWorldVel = launcherVel + missileWorldDir * mParams.ejectionVelocity;

                _missiles [i] = mParams.createMissile(
                    missileWorldPos, missileWorldDir, missileWorldVel, this, i);

                #if false
                _missiles [i] = new SSpaceMissileVisualData (
                    missileWorldPos, missileWorldDir, missileWorldVel,
                    this, clusterId: i);
                #endif
            }
        }
 public void removeMissile(SSpaceMissileVisualData missile)
 {
     missile.terminate();
 }
 public SSpaceMissileClusterVisualData launchCluster(
     Matrix4 launcherWorldMat, Vector3 launchVel, int numMissiles,
     ISSpaceMissileTarget target, float timeToHit,
     SSpaceMissileVisualParameters clusterParams,
     Vector3[] localPositioningOffsets = null,
     Vector3[] localDirectionPresets = null,
     BodiesFieldGenerator meshPositioningGenerator = null,
     SSpaceMissileVisualData.AtTargetFunc atTargetFunc = null
 )
 {
     var cluster = new SSpaceMissileClusterVisualData (
         launcherWorldMat, launchVel, numMissiles, target, timeToHit, clusterParams,
         localPositioningOffsets, localDirectionPresets, meshPositioningGenerator,
         atTargetFunc
     );
     _clusters.Add(cluster);
     _targets.Add(target);
     return cluster;
 }