// Start is called before the first frame update
void Start()
{
addPointButton.onClick.AddListener(SetAddPointState);
themesh = GetComponent <MeshFilter>().sharedMesh;
triangles = themesh.triangles;
meshvertices = themesh.vertices;
arapTris = new ARAPTriangle[triangles.Length / 3];
reorderVerID = new int[meshvertices.Length];
mvConstraint = new List <int>();
mvDeformed = meshvertices;
///precompute variables
for (int i = 0; i < triangles.Length / 3; i++)
{
ARAPTriangle t = new ARAPTriangle();
Vector3 v0 = meshvertices[triangles[i * 3]];
Vector3 v1 = meshvertices[triangles[i * 3 + 1]];
Vector3 v2 = meshvertices[triangles[i * 3 + 2]];
var v2local = ARAPOperation.FindLocalCoordinator(v0, v1, v2);
var v0local = ARAPOperation.FindLocalCoordinator(v1, v2, v0);
var v1local = ARAPOperation.FindLocalCoordinator(v2, v0, v1);
t.SetLocalXY(v0local, v1local, v2local);
t.SetVertexID(triangles[i * 3], triangles[i * 3 + 1], triangles[i * 3 + 2]);
t.scale_factor_divisor = Vector3.Dot(v1 - v0, v1 - v0);
t.PreComputeScaleAdjustmentMatrixFC();
arapTris[i] = t;
}
drawTris = new List <Vector3>();
for (int i = 0; i < triangles.Length / 3; i++)
{
drawTris.Add(mvDeformed[triangles[i * 3]]);
drawTris.Add(mvDeformed[triangles[i * 3 + 1]]);
drawTris.Add(mvDeformed[triangles[i * 3 + 2]]);
}
}
public static Vector3[] AdjustScaleToTriangle(ARAPTriangle thetriangle, Vector3[] mDrformedVertex)
{
Matrix triangle_points_coords = Matrix.ZeroMatrix(6, 1);
for (int i = 0; i < 3; i++)
{
int vid = thetriangle.vertex_id[i];
triangle_points_coords[i * 2, 0] = mDrformedVertex[vid].x;
triangle_points_coords[i * 2 + 1, 0] = mDrformedVertex[vid].y;
}
Matrix theF = thetriangle.mF;
Matrix theC = thetriangle.mC;
Matrix vfittedcoords = -1 * theF * theC * triangle_points_coords;
Vector3 v0f = new Vector3((float)vfittedcoords[0, 0], (float)vfittedcoords[1, 0], 0);
Vector3 v1f = new Vector3((float)vfittedcoords[2, 0], (float)vfittedcoords[3, 0], 0);
float x01 = thetriangle.local_xy[2].x;
float y01 = thetriangle.local_xy[2].y;
Vector3 v01 = v1f - v0f;
Vector3 v01R90 = Quaternion.AngleAxis(90, Vector3.forward) * (v01);
Vector3 v2f = v0f + x01 * (v01) + y01 * v01R90;
Vector3[] updateTriPoints = new Vector3[3];
updateTriPoints[0] = v0f; updateTriPoints[1] = v1f; updateTriPoints[2] = v2f;
Vector3 centermass = (v0f + v1f + v2f) / 3;
float sf = Mathf.Sqrt(thetriangle.scale_factor_divisor / Vector3.Dot(v01, v01));
for (int i = 0; i < 3; i++)
{
updateTriPoints[i] -= centermass;
updateTriPoints[i] *= sf;
updateTriPoints[i] += centermass;
}
return(updateTriPoints);
}
void MeshDeform()
{
int nConstaint = mvConstraint.Count;
if (mvConstraint.Count > 1)
{
Matrix vq = new Matrix(2 * nConstaint, 1);
for (int i = 0; i < nConstaint; i++)
{
vq[2 * i, 0] = mvDeformed[mvConstraint[i]].x;
vq[2 * i + 1, 0] = mvDeformed[mvConstraint[i]].y;
}
//step1 deform
var vu = scaleFreeMatrix * vq;
int nVerts = meshvertices.Length;
for (int i = 0; i < nVerts; i++)
{
if (mvConstraint.IndexOf(i) != -1)
{
continue;
}
int nRow = reorderVerID[i];
double fx = vu[2 * nRow, 0];
double fy = vu[2 * nRow + 1, 0];
mvDeformed[i] = new Vector3((float)fx, (float)fy, 0);
}
//step 2.1
float[] f = new float[2 * meshvertices.Length];
for (int i = 0; i < triangles.Length / 3; i++)
{
ARAPTriangle thetri = arapTris[i];
Vector3[] updatedTris = ARAPOperation.AdjustScaleToTriangle(thetri, mvDeformed);
for (int j = 0; j < 3; j++)
{
var v0f = updatedTris[j];
var v1f = updatedTris[(j + 1) % 3];
int v0f_id = reorderVerID[thetri.vertex_id[j]];
int v1f_id = reorderVerID[thetri.vertex_id[(j + 1) % 3]];
f[2 * v0f_id] += -2 * v0f.x + 2 * v1f.x;
f[2 * v0f_id + 1] += -2 * v0f.y + 2 * v1f.y;
f[2 * v1f_id] += 2 * v0f.x - 2 * v1f.x;
f[2 * v1f_id + 1] += 2 * v0f.y - 2 * v1f.y;
}
}
//step2.2
int nFreeVerts = nVerts - nConstaint;
Debug.Log(f[2 * nFreeVerts - 1]);
Debug.Log(f[2 * nFreeVerts]);
Matrix f0 = Matrix.ZeroMatrix(2 * nFreeVerts, 1);
for (int i = 0; i < 2 * nFreeVerts; i++)
{
f0[i, 0] = f[i];
}
for (int i = 0; i < nConstaint; i++)
{
vq[2 * i, 0] = mvDeformed[mvConstraint[i]].x;
vq[2 * i + 1, 0] = mvDeformed[mvConstraint[i]].y;
}
Matrix mb = -1 * (mHandmD[1] * vq + f0);
Matrix mu = mHandmD[0].SolveWith(mb);
for (int i = 0; i < nVerts; i++)
{
if (mvConstraint.IndexOf(i) != -1)
{
continue;
}
int nRow = reorderVerID[i];
double fx = mu[2 * nRow, 0];
double fy = mu[2 * nRow + 1, 0];
mvDeformed[i] = new Vector3((float)fx, (float)fy, 0);
}
drawTris = new List <Vector3>();
for (int i = 0; i < triangles.Length / 3; i++)
{
drawTris.Add(mvDeformed[triangles[i * 3]]);
drawTris.Add(mvDeformed[triangles[i * 3 + 1]]);
drawTris.Add(mvDeformed[triangles[i * 3 + 2]]);
}
}
}
//call every time add constraint point
public static Matrix UpdateConstraint(int ninitialVer, int nContraint, int[] mVertexMap, ARAPTriangle[] triangles)
{
Matrix mFirstMatrix = Matrix.ZeroMatrix(1, 1);
//matrix computation
int nfreeVec = ninitialVer - nContraint;
if (nContraint > 1)
{
Matrix mG = Matrix.ZeroMatrix(2 * ninitialVer, 2 * ninitialVer);
for (int i = 0; i < triangles.Length; i++)
{
ARAPTriangle tris = triangles[i];
for (int j = 0; j < 3; j++)
{
int v0_id = mVertexMap[tris.vertex_id[j]];
int v1_id = mVertexMap[tris.vertex_id[(j + 1) % 3]];
int v2_id = mVertexMap[tris.vertex_id[(j + 2) % 3]];
float x01 = tris.local_xy[(j + 2) % 3].x;
float y01 = tris.local_xy[(j + 2) % 3].y;
mG[2 * v0_id, 2 * v0_id] += Mathf.Pow(x01, 2) - 2 * x01 + Mathf.Pow(y01, 2) + 1;
mG[2 * v0_id, 2 * v0_id + 1] = 0 / 2;
mG[2 * v0_id + 1, 2 * v0_id] += 0;
mG[2 * v0_id, 2 * v1_id] += (1 - x01) * x01 - Mathf.Pow(y01, 2);
mG[2 * v1_id, 2 * v0_id] += (1 - x01) * x01 - Mathf.Pow(y01, 2);
mG[2 * v0_id, 2 * v1_id + 1] += -y01;
mG[2 * v1_id + 1, 2 * v0_id] += -y01;
mG[2 * v0_id, 2 * v2_id] += -(1 - x01);
mG[2 * v2_id, 2 * v0_id] += -(1 - x01);
mG[2 * v0_id, 2 * v2_id + 1] += y01;
mG[2 * v2_id + 1, 2 * v0_id] += y01;
mG[2 * v0_id + 1, 2 * v0_id + 1] += Mathf.Pow(x01, 2) - 2 * x01 + Mathf.Pow(y01, 2) + 1;
mG[2 * v0_id + 1, 2 * v1_id] += y01;
mG[2 * v1_id, 2 * v0_id + 1] += y01;
mG[2 * v0_id + 1, 2 * v1_id + 1] += x01 - x01 * x01 - y01 * y01;
mG[2 * v1_id + 1, 2 * v0_id + 1] += x01 - x01 * x01 - y01 * y01;
mG[2 * v0_id + 1, 2 * v2_id] += -y01;
mG[2 * v2_id, 2 * v0_id + 1] += -y01;
mG[2 * v0_id + 1, 2 * v2_id + 1] += -1 + x01;
mG[2 * v2_id + 1, 2 * v0_id + 1] += -1 + x01;
mG[2 * v1_id, 2 * v1_id] += Mathf.Pow(x01, 2) + Mathf.Pow(y01, 2);
mG[2 * v1_id, 2 * v1_id + 1] += 0 / 2;
mG[2 * v1_id + 1, 2 * v1_id] += 0 / 2;
mG[2 * v1_id, 2 * v2_id] += -x01;
mG[2 * v2_id, 2 * v1_id] += -x01;
mG[2 * v1_id, 2 * v2_id + 1] += -y01;
mG[2 * v2_id + 1, 2 * v1_id] += -y01;
mG[2 * v1_id + 1, 2 * v1_id + 1] += Mathf.Pow(x01, 2) + Mathf.Pow(y01, 2);
mG[2 * v1_id + 1, 2 * v2_id] += y01;
mG[2 * v2_id, 2 * v1_id + 1] += y01;
mG[2 * v1_id + 1, 2 * v2_id + 1] += -x01;
mG[2 * v2_id + 1, 2 * v1_id + 1] += -x01;
mG[2 * v2_id, 2 * v2_id] += 1;
mG[2 * v2_id, 2 * v2_id + 1] += 0;
mG[2 * v2_id + 1, 2 * v2_id] += 0;
mG[2 * v2_id + 1, 2 * v2_id + 1] += 1;
}
}
Matrix mG00 = mG.SubMatrix(0, 0, 2 * nfreeVec, 2 * nfreeVec);
Matrix mG01 = mG.SubMatrix(0, 2 * nfreeVec, 2 * nfreeVec, 2 * nContraint);
Matrix mG10 = mG.SubMatrix(2 * nfreeVec, 0, 2 * nContraint, 2 * nfreeVec);
Matrix mGprime = mG00 + Matrix.Transpose(mG00);
Matrix mB = mG01 + Matrix.Transpose(mG10);
Matrix mGprimeInverse = mGprime.Invert();
mFirstMatrix = -1 * mGprimeInverse * mB;
}
return(mFirstMatrix);
}
