libigl_Martin/python/405_AsRigidAsPossible.py

import igl
from math import sin,cos,pi

sea_green = igl.eigen.MatrixXd([[70./255.,252./255.,167./255.]])

V = igl.eigen.MatrixXd()
U = igl.eigen.MatrixXd()

F = igl.eigen.MatrixXi()

S = igl.eigen.MatrixXd()
b = igl.eigen.MatrixXi()

mid = igl.eigen.MatrixXd()

anim_t = 0.0;
anim_t_dir = 0.03;
arap_data = igl.ARAPData()

def pre_draw(viewer):
    global anim_t

    bc = igl.eigen.MatrixXd(b.size(),V.cols())
    for i in range(0,b.size()):
        bc.setRow(i,V.row(b[i]))
        if S[b[i]] == 0:
            r = mid[0]*0.25
            bc[i,0] = bc[i,0] + r*sin(0.5*anim_t*2.*pi)
            bc[i,1] = bc[i,1] - r+r*cos(pi+0.5*anim_t*2.*pi)
        elif S[b[i]] == 1:
            r = mid[1]*0.15
            bc[i,1] = bc[i,1] + r + r*cos(pi + 0.15*anim_t*2.*pi)
            bc[i,2] = bc[i,2] - r*sin(0.15*anim_t*2.*pi)
        elif S[b[i]] == 2:
            r = mid[1]*0.15
            bc[i,2] = bc[i,2] + r+r*cos(pi+0.35*anim_t*2.*pi)
            bc[i,0] = bc[i,0] + r*sin(0.35*anim_t*2.*pi)

    igl.arap_solve(bc,arap_data,U)
    viewer.data.set_vertices(U)
    viewer.data.compute_normals()

    if viewer.core.is_animating:
        anim_t += anim_t_dir

    return False

def key_down(viewer, key, mods):
    if key == ord(' '):
        viewer.core.is_animating = not viewer.core.is_animating
        return True
    return False

igl.readOFF("../tutorial/shared/decimated-knight.off",V,F)
U = igl.eigen.MatrixXd(V)
igl.readDMAT("../tutorial/shared/decimated-knight-selection.dmat",S)

# Vertices in selection

b = igl.eigen.MatrixXi([[t[0] for t in [(i,S[i]) for i in range(0,V.rows())] if t[1] >= 0]]).transpose()

# Centroid
mid = 0.5*(V.colwiseMaxCoeff() + V.colwiseMinCoeff())

# Precomputation
arap_data.max_iter = 100
igl.arap_precomputation(V,F,V.cols(),b,arap_data)

# Set color based on selection
C = igl.eigen.MatrixXd(F.rows(),3)
purple = igl.eigen.MatrixXd([[80.0/255.0,64.0/255.0,255.0/255.0]])
gold   = igl.eigen.MatrixXd([[255.0/255.0,228.0/255.0,58.0/255.0]])

for f in range(0,F.rows()):
    if S[F[f,0]]>=0 and S[F[f,1]]>=0 and S[F[f,2]]>=0:
        C.setRow(f,purple)
    else:
        C.setRow(f,gold)

# Plot the mesh with pseudocolors
viewer = igl.viewer.Viewer()
viewer.data.set_mesh(U, F)
viewer.data.set_colors(C)
viewer.callback_pre_draw = pre_draw
viewer.callback_key_down = key_down
viewer.core.is_animating = True
viewer.core.animation_max_fps = 30.
print("Press [space] to toggle animation")
viewer.launch()