private static void SetupBones(Transform parent, MeshData md, Parachute p, ParachuteMeshConfig cf)
{
var c = p.Config;
float spanStep = c.Span / c.NumCells;
p.Bones = new Transform[c.NumCells];
for (int i = 0; i < c.NumCells; i++)
{
var go = new GameObject("Cell_" + i);
var t = go.transform;
t.position = Vector3.right * (0.5f * spanStep) + Vector3.right * (spanStep * i);
t.rotation = Quaternion.Euler(-0.5f, 0f, 0f); // Todo: align with median chord
t.parent = parent;
var b = t.worldToLocalMatrix * parent.localToWorldMatrix;
md.Bones.Add(t);
md.BindPoses.Add(b);
p.Bones[i] = t;
}
}
public static void CreateSkinnedMesh(Parachute p, ParachuteMeshConfig cf, Material mat)
{
if (_meshData == null)
{
throw new Exception("UnityParachuteMeshFactory needs to be initialized before use!");
}
Clear();
// Todo: Reuse mesh, game objects, as much as possible. Create pool of cells.
Profiler.BeginSample("GOCreation");
GameObject mo = new GameObject("ParachuteMesh");
mo.transform.parent = p.Root;
SkinnedMeshRenderer r = mo.AddComponent <SkinnedMeshRenderer>();
r.updateWhenOffscreen = true; // Todo: This is not great
r.skinnedMotionVectors = true;
r.motionVectorGenerationMode = MotionVectorGenerationMode.ForceNoMotion;
Profiler.EndSample();
Profiler.BeginSample("SetupBones");
SetupBones(mo.transform, _meshData, p, cf);
Profiler.EndSample();
Profiler.BeginSample("EdgeLoops");
CreateCellLoops(_meshData, _edgeLoops, p.Config, cf);
Profiler.EndSample();
Profiler.BeginSample("Caps");
CreateCap(_edgeLoops[0], _meshData, cf, 0, -0.33f);
int startIndex = _meshData.Indices.Count;
CreateCap(_edgeLoops[_edgeLoops.Count - 1], _meshData, cf, p.Config.NumCells - 1, 0.33f);
int endIndex = _meshData.Indices.Count;
InvertFaces(_meshData, startIndex, endIndex);
Profiler.EndSample();
Profiler.BeginSample("CreateMesh");
Mesh m = MeshData.CreateMesh(_meshData);
Profiler.EndSample();
Profiler.BeginSample("Finalize");
mat.color = p.Config.Color;
r.bones = _meshData.Bones.ToArray();
r.sharedMesh = m;
r.material = mat;
p.CanopyMesh = r;
Profiler.EndSample();
}
public static void Initialize(ParachuteMeshConfig cf)
{
_meshData = new MeshData();
const int maxLoops = 256;
Queue <int[]> q = new Queue <int[]>(maxLoops);
for (int i = 0; i < maxLoops; i++)
{
int[] loop = new int[cf.CellChordLoops + cf.CellChordLoops - 2]; // Todo: Make more straightforward
q.Enqueue(loop);
}
_loopPool = new Pool <int[]>(q, ClearLoop);
_edgeLoops = new List <int[]>(maxLoops);
}
private static void CreateCap(int[] loop, MeshData md, ParachuteMeshConfig cf, int cell, float bulge)
{
// Create a strip of verts through the middle of the foil.
List <int> midVerts = new List <int>();
midVerts.Add(loop[0]);
for (int i = 1; i < loop.Length / 2; i++)
{
Vector3 a = md.Vertices[loop[i]];
Vector3 b = md.Vertices[loop[loop.Length - i]];
Vector3 v = Vector3.Lerp(a, b, 0.5f);
v.x += cf.ChordUpperThickness.Evaluate(i / (loop.Length / 2f)) * bulge;
md.Vertices.Add(v);
var w = new BoneWeight()
{
boneIndex0 = cell,
weight0 = 1f
};
md.Weights.Add(w);
midVerts.Add(md.Vertices.Count - 1);
}
midVerts.Add(loop[loop.Length / 2]);
// Apart from the front and aft points, this can all be quads
for (int i = 1; i < midVerts.Count - 2; i++)
{
// Bot
md.Indices.Add(midVerts[i + 0]);
md.Indices.Add(loop[i + 1]);
md.Indices.Add(loop[i + 0]);
md.Indices.Add(midVerts[i + 0]);
md.Indices.Add(midVerts[i + 1]);
md.Indices.Add(loop[i + 1]);
//
// Top
md.Indices.Add(loop[loop.Length - (i + 0)]);
md.Indices.Add(loop[loop.Length - (i + 1)]);
md.Indices.Add(midVerts[i + 0]);
md.Indices.Add(loop[loop.Length - (i + 1)]);
md.Indices.Add(midVerts[i + 1]);
md.Indices.Add(midVerts[i + 0]);
}
// Now finish up by adding 4 missing corner triangles
// Afttop
md.Indices.Add(midVerts[0]);
md.Indices.Add(midVerts[1]);
md.Indices.Add(loop[1]);
// Aftbot
md.Indices.Add(midVerts[1]);
md.Indices.Add(midVerts[0]);
md.Indices.Add(loop[loop.Length - 1]);
// FrontTop
md.Indices.Add(midVerts[midVerts.Count - 2]);
md.Indices.Add(midVerts[midVerts.Count - 1]);
md.Indices.Add(loop[loop.Length / 2 - 1]);
// FrontBot
md.Indices.Add(midVerts[midVerts.Count - 1]);
md.Indices.Add(midVerts[midVerts.Count - 2]);
md.Indices.Add(loop[loop.Length / 2] + 1);
}
private static void CreateCellEdgeLoop(MeshData md, int[] loop, ParachuteConfig cfg, ParachuteMeshConfig cf, float spanPos, float scale)
{
// Note: top vertex row has the outermost chord tip verts. Bottom reuses those.
int idx = 0;
float zScale = (0.8f + scale * 0.2f);
float zMin = -0.5f * cfg.Chord * zScale;
// Top
for (int i = 0; i < cf.CellChordLoops; i++)
{
float chordLerp = i / (float)(cf.CellChordLoops - 1);
float c = cf.ChordLineCurvature.Evaluate(chordLerp);
c += cf.ChordUpperThickness.Evaluate(chordLerp) * scale;
Vector3 v = new Vector3(
spanPos,
c,
zMin + chordLerp * cfg.Chord * zScale
);
md.Vertices.Add(v);
BoneWeight w = GetBoneWeight(v, cfg);
md.Weights.Add(w);
loop[idx++] = md.Vertices.Count - 1;
}
// Bottom
for (int i = 1; i < cf.CellChordLoops - 1; i++)
{
float chordLerp = 1f - i / (float)(cf.CellChordLoops - 1);
float c = cf.ChordLineCurvature.Evaluate(chordLerp);
c += cf.ChordLowerThickness.Evaluate(chordLerp) * scale;
Vector3 v = new Vector3(
spanPos,
c,
zMin + chordLerp * cfg.Chord * zScale
);
md.Vertices.Add(v);
BoneWeight w = GetBoneWeight(v, cfg);
md.Weights.Add(w);
loop[idx++] = md.Vertices.Count - 1;
}
}
private static void CreateCellLoops(MeshData md, List <int[]> loops, ParachuteConfig cfg, ParachuteMeshConfig cf)
{
// Create the loops
float spanStep = cfg.Span / cfg.NumCells / cf.CellSpanLoops;
for (int i = 0; i < cfg.NumCells; i++)
{
for (int j = 0; j < cf.CellSpanLoops; j++)
{
float z = spanStep * (i * cf.CellSpanLoops + j);
float s = cf.SpanCellCurvature.Evaluate(j / ((float)cf.CellSpanLoops));
var l = _loopPool.Take();
CreateCellEdgeLoop(md, l, cfg, cf, z, s);
loops.Add(l);
}
}
// Create the last loop
var ll = _loopPool.Take();
CreateCellEdgeLoop(md, ll, cfg, cf, cfg.Span, cf.SpanCellCurvature.Evaluate(1f));
loops.Add(ll);
// Create the faces between the loops
for (int i = 0; i < loops.Count - 1; i++)
{
CreateLoopFaces(loops[i], loops[i + 1], md);
}
}