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corrected evolution so that it doesn't overshoot. Modified smoothness-viewpoint balance

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This commit is contained in:
Paolo Cignoni cignoni 2010-09-09 23:07:51 +00:00
parent b1a129b21b
commit 199680f75d
1 changed files with 30 additions and 18 deletions
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48
src/meshlabplugins/edit_vase/balloon.cpp
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@ -56,7 +56,7 @@ void Balloon::init( int gridsize, int gridpad ){
bool Balloon::initializeField(){
//--- Setup the interpolation system
// if we fail, signal the failure to the caller
float OMEGA = 1; // 1e8
float OMEGA = 1e3; // 1e8
LAPLACIAN type = COTANGENT; // COMBINATORIAL
bool op_succeed = finterp.Init( &surf, 1, type );
if( !op_succeed ){
@ -361,15 +361,15 @@ void Balloon::evolve(){
int axis;
if (f.Flags() & CFaceO::NORMX ) axis = 0;
else if(f.Flags() & CFaceO::NORMY ) axis = 1;
else axis = 2;
else axis = 2;
vcg::InterpolationParameters(triFace, axis, proj, c);
// Interpolate update amounts & keep track of the range
if( surf.vert.QualityEnabled ){
updates_view[i] = c[0]*f.V(0)->Q() + c[1]*f.V(1)->Q() + c[2]*f.V(2)->Q();
view_max_absdst = (fabs(updates_view[i])>view_max_absdst) ? fabs(updates_view[i]) : view_max_absdst;
// view_max_dst = updates_view[i]>view_max_dst ? updates_view[i] : view_max_dst;
// view_min_dst = updates_view[i]<view_min_dst ? updates_view[i] : view_min_dst;
view_max_dst = updates_view[i]>view_max_dst ? updates_view[i] : view_max_dst;
view_min_dst = updates_view[i]<view_min_dst ? updates_view[i] : view_min_dst;
}
// Interpolate curvature amount & keep track of the range
if( surf.vert.CurvatureEnabled ){
@ -379,8 +379,7 @@ void Balloon::evolve(){
}
// Only meaningful if it has been computed..
qDebug("Delta: %f", vol.getDelta());
if( surf.vert.QualityEnabled )
qDebug("view distance: min %.3f max %.3f", view_min_dst, view_max_dst);
if( surf.vert.CurvatureEnabled )
@ -389,17 +388,21 @@ void Balloon::evolve(){
//--- Apply exponential functions to modulate and regularize the updates
float sigma2 = vol.getDelta()*vol.getDelta();
float k1, k3;
float targetdst = vol.getDelta()/2;
float max_speed = vol.getDelta()/2;
// Slowdown weight, smaller if converging
//--- Maximum speed: avoid over-shoothing by limiting update speed
// E_view + alpha*E_smooth
float balance_coeff = .5;
// Slowdown weight, smaller if worst case scenario is very converging
float k2 = 1 - exp( -powf(view_max_absdst,2) / sigma2 );
for(unsigned int i=0; i<vol.band.size(); i++){
Point3i& voxi = vol.band[i];
MyVoxel& v = vol.Voxel(voxi);
//--- Avoids over-shooting, as maximum speed is bound to dist from surface
float max_speed = std::min( vol.getDelta()/2, std::abs(updates_view[i]) );
//--- Distance weights
if( surf.vert.QualityEnabled ){
// Faster if I am located further
@ -407,25 +410,34 @@ void Balloon::evolve(){
}
//--- Curvature weight (faster if spiky)
if( surf.vert.CurvatureEnabled )
k3 = updates_curv[i] / curv_maxval;
// k3 = updates_curv[i] / curv_maxval;
k3 = sign(1.0f,updates_curv[i])*exp(-powf(fabs(updates_curv[i])-curv_maxval,2)/curv_maxval);
//--- Apply the update on the implicit field
if( surf.vert.QualityEnabled ){
float prev = v.sfield;
v.sfield += vcg::sign( k1*k2*max_speed, updates_view[i] );
if( v.sfield < 0 && prev > 0){
qDebug("Update from f=%.3f to %.3f", prev, v.sfield);
qDebug("k1: %.2f", k1);
qDebug("k3: %.2f", k3);
qDebug("max_speed: %.2f", max_speed);
}
// v.sfield += vcg::sign( .15f*k1*k2*vol.getDelta(), updates_view[i]);
// v.sfield += .25f * k1 * vol.getDelta();
}
// if we don't have computed the distance field, we don't really know how to
// modulate the laplacian accordingly...
#ifdef TRUE // ENABLE_CURVATURE_IN_EVOLUTION
// #if TRUE // ENABLE_CURVATURE_IN_EVOLUTION
// if( surf.vert.CurvatureEnabled && surf.vert.QualityEnabled ){
// v.sfield += .1*k3*k2;
// }
else if( surf.vert.CurvatureEnabled ){
v.sfield += .1*k3; // prev .1
// v.sfield += .1*k3*k2;
// }
if( surf.vert.CurvatureEnabled ){
v.sfield += k3*balance_coeff*max_speed; // prev .1
}
#endif
// #endif
}
//--- DEBUG LINES: what's being updated (cannot put above cause it's in a loop)