btSoftBody* btSoftBodyHelpers::CreateFromConvexHull(btSoftBodyWorldInfo& worldInfo, const btVector3* vertices,
int nvertices, bool randomizeConstraints)
{
HullDesc hdsc(QF_TRIANGLES,nvertices,vertices);
HullResult hres;
HullLibrary hlib;/*??*/
hdsc.mMaxVertices=nvertices;
hlib.CreateConvexHull(hdsc,hres);
btSoftBody* psb=new btSoftBody(&worldInfo,(int)hres.mNumOutputVertices,
&hres.m_OutputVertices[0],0);
for(int i=0;i<(int)hres.mNumFaces;++i)
{
const int idx[]={ hres.m_Indices[i*3+0],
hres.m_Indices[i*3+1],
hres.m_Indices[i*3+2]};
if(idx[0]<idx[1]) psb->appendLink( idx[0],idx[1]);
if(idx[1]<idx[2]) psb->appendLink( idx[1],idx[2]);
if(idx[2]<idx[0]) psb->appendLink( idx[2],idx[0]);
psb->appendFace(idx[0],idx[1],idx[2]);
}
hlib.ReleaseResult(hres);
if (randomizeConstraints)
{
psb->randomizeConstraints();
}
return(psb);
}
void btSoftBodyHelpers::Draw( btSoftBody* psb,
btIDebugDraw* idraw,
int drawflags)
{
const btScalar scl=(btScalar)0.1;
const btScalar nscl=scl*5;
const btVector3 lcolor=btVector3(0,0,0);
const btVector3 ncolor=btVector3(1,1,1);
const btVector3 ccolor=btVector3(1,0,0);
int i,j,nj;
/* Nodes */
if(0!=(drawflags&fDrawFlags::Nodes))
{
for(i=0;i<psb->m_nodes.size();++i)
{
const btSoftBody::Node& n=psb->m_nodes[i];
if(0==(n.m_material->m_flags&btSoftBody::fMaterial::DebugDraw)) continue;
idraw->drawLine(n.m_x-btVector3(scl,0,0),n.m_x+btVector3(scl,0,0),btVector3(1,0,0));
idraw->drawLine(n.m_x-btVector3(0,scl,0),n.m_x+btVector3(0,scl,0),btVector3(0,1,0));
idraw->drawLine(n.m_x-btVector3(0,0,scl),n.m_x+btVector3(0,0,scl),btVector3(0,0,1));
}
}
/* Links */
if(0!=(drawflags&fDrawFlags::Links))
{
for(i=0;i<psb->m_links.size();++i)
{
const btSoftBody::Link& l=psb->m_links[i];
if(0==(l.m_material->m_flags&btSoftBody::fMaterial::DebugDraw)) continue;
idraw->drawLine(l.m_n[0]->m_x,l.m_n[1]->m_x,lcolor);
}
}
/* Normals */
if(0!=(drawflags&fDrawFlags::Normals))
{
for(i=0;i<psb->m_nodes.size();++i)
{
const btSoftBody::Node& n=psb->m_nodes[i];
if(0==(n.m_material->m_flags&btSoftBody::fMaterial::DebugDraw)) continue;
const btVector3 d=n.m_n*nscl;
idraw->drawLine(n.m_x,n.m_x+d,ncolor);
idraw->drawLine(n.m_x,n.m_x-d,ncolor*0.5);
}
}
/* Contacts */
if(0!=(drawflags&fDrawFlags::Contacts))
{
static const btVector3 axis[]={btVector3(1,0,0),
btVector3(0,1,0),
btVector3(0,0,1)};
for(i=0;i<psb->m_rcontacts.size();++i)
{
const btSoftBody::RContact& c=psb->m_rcontacts[i];
const btVector3 o= c.m_node->m_x-c.m_cti.m_normal*
(dot(c.m_node->m_x,c.m_cti.m_normal)+c.m_cti.m_offset);
const btVector3 x=cross(c.m_cti.m_normal,axis[c.m_cti.m_normal.minAxis()]).normalized();
const btVector3 y=cross(x,c.m_cti.m_normal).normalized();
idraw->drawLine(o-x*nscl,o+x*nscl,ccolor);
idraw->drawLine(o-y*nscl,o+y*nscl,ccolor);
idraw->drawLine(o,o+c.m_cti.m_normal*nscl*3,btVector3(1,1,0));
}
}
/* Anchors */
if(0!=(drawflags&fDrawFlags::Anchors))
{
for(i=0;i<psb->m_anchors.size();++i)
{
const btSoftBody::Anchor& a=psb->m_anchors[i];
const btVector3 q=a.m_body->getWorldTransform()*a.m_local;
drawVertex(idraw,a.m_node->m_x,0.25,btVector3(1,0,0));
drawVertex(idraw,q,0.25,btVector3(0,1,0));
idraw->drawLine(a.m_node->m_x,q,btVector3(1,1,1));
}
for(i=0;i<psb->m_nodes.size();++i)
{
const btSoftBody::Node& n=psb->m_nodes[i];
if(0==(n.m_material->m_flags&btSoftBody::fMaterial::DebugDraw)) continue;
if(n.m_im<=0)
{
drawVertex(idraw,n.m_x,0.25,btVector3(1,0,0));
}
}
}
/* Faces */
if(0!=(drawflags&fDrawFlags::Faces))
{
const btScalar scl=(btScalar)0.8;
const btScalar alp=(btScalar)1;
const btVector3 col(0,(btScalar)0.7,0);
for(i=0;i<psb->m_faces.size();++i)
{
const btSoftBody::Face& f=psb->m_faces[i];
if(0==(f.m_material->m_flags&btSoftBody::fMaterial::DebugDraw)) continue;
const btVector3 x[]={f.m_n[0]->m_x,f.m_n[1]->m_x,f.m_n[2]->m_x};
const btVector3 c=(x[0]+x[1]+x[2])/3;
idraw->drawTriangle((x[0]-c)*scl+c,
(x[1]-c)*scl+c,
(x[2]-c)*scl+c,
col,alp);
}
}
/* Clusters */
if(0!=(drawflags&fDrawFlags::Clusters))
{
srand(1806);
for(i=0;i<psb->m_clusters.size();++i)
{
if(psb->m_clusters[i]->m_collide)
{
btVector3 color( rand()/(btScalar)RAND_MAX,
rand()/(btScalar)RAND_MAX,
rand()/(btScalar)RAND_MAX);
color=color.normalized()*0.75;
btAlignedObjectArray<btVector3> vertices;
vertices.resize(psb->m_clusters[i]->m_nodes.size());
for(j=0,nj=vertices.size();j<nj;++j)
{
vertices[j]=psb->m_clusters[i]->m_nodes[j]->m_x;
}
HullDesc hdsc(QF_TRIANGLES,vertices.size(),&vertices[0]);
HullResult hres;
HullLibrary hlib;
hdsc.mMaxVertices=vertices.size();
hlib.CreateConvexHull(hdsc,hres);
const btVector3 center=average(hres.m_OutputVertices);
add(hres.m_OutputVertices,-center);
mul(hres.m_OutputVertices,(btScalar)1);
add(hres.m_OutputVertices,center);
for(j=0;j<(int)hres.mNumFaces;++j)
{
const int idx[]={hres.m_Indices[j*3+0],hres.m_Indices[j*3+1],hres.m_Indices[j*3+2]};
idraw->drawTriangle(hres.m_OutputVertices[idx[0]],
hres.m_OutputVertices[idx[1]],
hres.m_OutputVertices[idx[2]],
color,1);
}
hlib.ReleaseResult(hres);
}
/* Velocities */
#if 0
for(int j=0;j<psb->m_clusters[i].m_nodes.size();++j)
{
const btSoftBody::Cluster& c=psb->m_clusters[i];
const btVector3 r=c.m_nodes[j]->m_x-c.m_com;
const btVector3 v=c.m_lv+cross(c.m_av,r);
idraw->drawLine(c.m_nodes[j]->m_x,c.m_nodes[j]->m_x+v,btVector3(1,0,0));
}
#endif
/* Frame */
btSoftBody::Cluster& c=*psb->m_clusters[i];
idraw->drawLine(c.m_com,c.m_framexform*btVector3(10,0,0),btVector3(1,0,0));
idraw->drawLine(c.m_com,c.m_framexform*btVector3(0,10,0),btVector3(0,1,0));
idraw->drawLine(c.m_com,c.m_framexform*btVector3(0,0,10),btVector3(0,0,1));
}
}
/* Notes */
if(0!=(drawflags&fDrawFlags::Notes))
{
for(i=0;i<psb->m_notes.size();++i)
{
const btSoftBody::Note& n=psb->m_notes[i];
btVector3 p=n.m_offset;
for(int j=0;j<n.m_rank;++j)
{
p+=n.m_nodes[j]->m_x*n.m_coords[j];
}
idraw->draw3dText(p,n.m_text);
}
}
/* Node tree */
if(0!=(drawflags&fDrawFlags::NodeTree)) DrawNodeTree(psb,idraw);
/* Face tree */
if(0!=(drawflags&fDrawFlags::FaceTree)) DrawFaceTree(psb,idraw);
/* Cluster tree */
if(0!=(drawflags&fDrawFlags::ClusterTree)) DrawClusterTree(psb,idraw);
/* Joints */
if(0!=(drawflags&fDrawFlags::Joints))
{
for(i=0;i<psb->m_joints.size();++i)
{
const btSoftBody::Joint* pj=psb->m_joints[i];
switch(pj->Type())
{
case btSoftBody::Joint::eType::Linear:
{
const btSoftBody::LJoint* pjl=(const btSoftBody::LJoint*)pj;
const btVector3 a0=pj->m_bodies[0].xform()*pjl->m_refs[0];
const btVector3 a1=pj->m_bodies[1].xform()*pjl->m_refs[1];
idraw->drawLine(pj->m_bodies[0].xform().getOrigin(),a0,btVector3(1,1,0));
idraw->drawLine(pj->m_bodies[1].xform().getOrigin(),a1,btVector3(0,1,1));
drawVertex(idraw,a0,0.25,btVector3(1,1,0));
drawVertex(idraw,a1,0.25,btVector3(0,1,1));
}
break;
case btSoftBody::Joint::eType::Angular:
{
const btSoftBody::AJoint* pja=(const btSoftBody::AJoint*)pj;
const btVector3 o0=pj->m_bodies[0].xform().getOrigin();
const btVector3 o1=pj->m_bodies[1].xform().getOrigin();
const btVector3 a0=pj->m_bodies[0].xform().getBasis()*pj->m_refs[0];
const btVector3 a1=pj->m_bodies[1].xform().getBasis()*pj->m_refs[1];
idraw->drawLine(o0,o0+a0*10,btVector3(1,1,0));
idraw->drawLine(o0,o0+a1*10,btVector3(1,1,0));
idraw->drawLine(o1,o1+a0*10,btVector3(0,1,1));
idraw->drawLine(o1,o1+a1*10,btVector3(0,1,1));
}
}
}
}
}
void btSoftBodyHelpers::Draw( btSoftBody* psb,
btIDebugDraw* idraw,
int drawflags)
{
const btScalar scl=(btScalar)0.1;
const btScalar nscl=scl*5;
const btVector3 lcolor=btVector3(0,0,0);
const btVector3 ncolor=btVector3(1,1,1);
const btVector3 ccolor=btVector3(1,0,0);
int i,j,nj;
/* Clusters */
if(0!=(drawflags&fDrawFlags::Clusters))
{
srand(1806);
for(i=0;i<psb->m_clusters.size();++i)
{
if(psb->m_clusters[i]->m_collide)
{
btVector3 color( rand()/(btScalar)RAND_MAX,
rand()/(btScalar)RAND_MAX,
rand()/(btScalar)RAND_MAX);
color=color.normalized()*0.75;
btAlignedObjectArray<btVector3> vertices;
vertices.resize(psb->m_clusters[i]->m_nodes.size());
for(j=0,nj=vertices.size();j<nj;++j)
{
vertices[j]=psb->m_clusters[i]->m_nodes[j]->m_x;
}
#define USE_NEW_CONVEX_HULL_COMPUTER
#ifdef USE_NEW_CONVEX_HULL_COMPUTER
btConvexHullComputer computer;
int stride = sizeof(btVector3);
int count = vertices.size();
btScalar shrink=0.f;
btScalar shrinkClamp=0.f;
computer.compute(&vertices[0].getX(),stride,count,shrink,shrinkClamp);
for (int i=0;i<computer.faces.size();i++)
{
int face = computer.faces[i];
//printf("face=%d\n",face);
const btConvexHullComputer::Edge* firstEdge = &computer.edges[face];
const btConvexHullComputer::Edge* edge = firstEdge->getNextEdgeOfFace();
int v0 = firstEdge->getSourceVertex();
int v1 = firstEdge->getTargetVertex();
while (edge!=firstEdge)
{
int v2 = edge->getTargetVertex();
idraw->drawTriangle(computer.vertices[v0],computer.vertices[v1],computer.vertices[v2],color,1);
edge = edge->getNextEdgeOfFace();
v0=v1;
v1=v2;
};
}
#else
HullDesc hdsc(QF_TRIANGLES,vertices.size(),&vertices[0]);
HullResult hres;
HullLibrary hlib;
hdsc.mMaxVertices=vertices.size();
hlib.CreateConvexHull(hdsc,hres);
const btVector3 center=average(hres.m_OutputVertices);
add(hres.m_OutputVertices,-center);
mul(hres.m_OutputVertices,(btScalar)1);
add(hres.m_OutputVertices,center);
for(j=0;j<(int)hres.mNumFaces;++j)
{
const int idx[]={hres.m_Indices[j*3+0],hres.m_Indices[j*3+1],hres.m_Indices[j*3+2]};
idraw->drawTriangle(hres.m_OutputVertices[idx[0]],
hres.m_OutputVertices[idx[1]],
hres.m_OutputVertices[idx[2]],
color,1);
}
hlib.ReleaseResult(hres);
#endif
}
/* Velocities */
#if 0
for(int j=0;j<psb->m_clusters[i].m_nodes.size();++j)
{
const btSoftBody::Cluster& c=psb->m_clusters[i];
const btVector3 r=c.m_nodes[j]->m_x-c.m_com;
const btVector3 v=c.m_lv+btCross(c.m_av,r);
idraw->drawLine(c.m_nodes[j]->m_x,c.m_nodes[j]->m_x+v,btVector3(1,0,0));
}
#endif
/* Frame */
// btSoftBody::Cluster& c=*psb->m_clusters[i];
// idraw->drawLine(c.m_com,c.m_framexform*btVector3(10,0,0),btVector3(1,0,0));
// idraw->drawLine(c.m_com,c.m_framexform*btVector3(0,10,0),btVector3(0,1,0));
// idraw->drawLine(c.m_com,c.m_framexform*btVector3(0,0,10),btVector3(0,0,1));
}
}
else
{
/* Nodes */
if(0!=(drawflags&fDrawFlags::Nodes))
{
for(i=0;i<psb->m_nodes.size();++i)
{
const btSoftBody::Node& n=psb->m_nodes[i];
if(0==(n.m_material->m_flags&btSoftBody::fMaterial::DebugDraw)) continue;
idraw->drawLine(n.m_x-btVector3(scl,0,0),n.m_x+btVector3(scl,0,0),btVector3(1,0,0));
idraw->drawLine(n.m_x-btVector3(0,scl,0),n.m_x+btVector3(0,scl,0),btVector3(0,1,0));
idraw->drawLine(n.m_x-btVector3(0,0,scl),n.m_x+btVector3(0,0,scl),btVector3(0,0,1));
}
}
/* Links */
if(0!=(drawflags&fDrawFlags::Links))
{
for(i=0;i<psb->m_links.size();++i)
{
const btSoftBody::Link& l=psb->m_links[i];
if(0==(l.m_material->m_flags&btSoftBody::fMaterial::DebugDraw)) continue;
idraw->drawLine(l.m_n[0]->m_x,l.m_n[1]->m_x,lcolor);
}
}
/* Normals */
if(0!=(drawflags&fDrawFlags::Normals))
{
for(i=0;i<psb->m_nodes.size();++i)
{
const btSoftBody::Node& n=psb->m_nodes[i];
if(0==(n.m_material->m_flags&btSoftBody::fMaterial::DebugDraw)) continue;
const btVector3 d=n.m_n*nscl;
idraw->drawLine(n.m_x,n.m_x+d,ncolor);
idraw->drawLine(n.m_x,n.m_x-d,ncolor*0.5);
}
}
/* Contacts */
if(0!=(drawflags&fDrawFlags::Contacts))
{
static const btVector3 axis[]={btVector3(1,0,0),
btVector3(0,1,0),
btVector3(0,0,1)};
for(i=0;i<psb->m_rcontacts.size();++i)
{
const btSoftBody::RContact& c=psb->m_rcontacts[i];
const btVector3 o= c.m_node->m_x-c.m_cti.m_normal*
(btDot(c.m_node->m_x,c.m_cti.m_normal)+c.m_cti.m_offset);
const btVector3 x=btCross(c.m_cti.m_normal,axis[c.m_cti.m_normal.minAxis()]).normalized();
const btVector3 y=btCross(x,c.m_cti.m_normal).normalized();
idraw->drawLine(o-x*nscl,o+x*nscl,ccolor);
idraw->drawLine(o-y*nscl,o+y*nscl,ccolor);
idraw->drawLine(o,o+c.m_cti.m_normal*nscl*3,btVector3(1,1,0));
}
}
/* Faces */
if(0!=(drawflags&fDrawFlags::Faces))
{
const btScalar scl=(btScalar)0.8;
const btScalar alp=(btScalar)1;
const btVector3 col(0,(btScalar)0.7,0);
for(i=0;i<psb->m_faces.size();++i)
{
const btSoftBody::Face& f=psb->m_faces[i];
if(0==(f.m_material->m_flags&btSoftBody::fMaterial::DebugDraw)) continue;
const btVector3 x[]={f.m_n[0]->m_x,f.m_n[1]->m_x,f.m_n[2]->m_x};
const btVector3 c=(x[0]+x[1]+x[2])/3;
idraw->drawTriangle((x[0]-c)*scl+c,
(x[1]-c)*scl+c,
(x[2]-c)*scl+c,
col,alp);
}
}
/* Tetras */
if(0!=(drawflags&fDrawFlags::Tetras))
{
const btScalar scl=(btScalar)0.8;
const btScalar alp=(btScalar)1;
const btVector3 col((btScalar)0.3,(btScalar)0.3,(btScalar)0.7);
for(int i=0;i<psb->m_tetras.size();++i)
{
const btSoftBody::Tetra& t=psb->m_tetras[i];
if(0==(t.m_material->m_flags&btSoftBody::fMaterial::DebugDraw)) continue;
const btVector3 x[]={t.m_n[0]->m_x,t.m_n[1]->m_x,t.m_n[2]->m_x,t.m_n[3]->m_x};
const btVector3 c=(x[0]+x[1]+x[2]+x[3])/4;
idraw->drawTriangle((x[0]-c)*scl+c,(x[1]-c)*scl+c,(x[2]-c)*scl+c,col,alp);
idraw->drawTriangle((x[0]-c)*scl+c,(x[1]-c)*scl+c,(x[3]-c)*scl+c,col,alp);
idraw->drawTriangle((x[1]-c)*scl+c,(x[2]-c)*scl+c,(x[3]-c)*scl+c,col,alp);
idraw->drawTriangle((x[2]-c)*scl+c,(x[0]-c)*scl+c,(x[3]-c)*scl+c,col,alp);
}
}
}
/* Anchors */
if(0!=(drawflags&fDrawFlags::Anchors))
{
for(i=0;i<psb->m_anchors.size();++i)
{
const btSoftBody::Anchor& a=psb->m_anchors[i];
const btVector3 q=a.m_body->getWorldTransform()*a.m_local;
drawVertex(idraw,a.m_node->m_x,0.25,btVector3(1,0,0));
drawVertex(idraw,q,0.25,btVector3(0,1,0));
idraw->drawLine(a.m_node->m_x,q,btVector3(1,1,1));
}
for(i=0;i<psb->m_nodes.size();++i)
{
const btSoftBody::Node& n=psb->m_nodes[i];
if(0==(n.m_material->m_flags&btSoftBody::fMaterial::DebugDraw)) continue;
if(n.m_im<=0)
{
drawVertex(idraw,n.m_x,0.25,btVector3(1,0,0));
}
}
}
/* Notes */
if(0!=(drawflags&fDrawFlags::Notes))
{
for(i=0;i<psb->m_notes.size();++i)
{
const btSoftBody::Note& n=psb->m_notes[i];
btVector3 p=n.m_offset;
for(int j=0;j<n.m_rank;++j)
{
p+=n.m_nodes[j]->m_x*n.m_coords[j];
}
idraw->draw3dText(p,n.m_text);
}
}
/* Node tree */
if(0!=(drawflags&fDrawFlags::NodeTree)) DrawNodeTree(psb,idraw);
/* Face tree */
if(0!=(drawflags&fDrawFlags::FaceTree)) DrawFaceTree(psb,idraw);
/* Cluster tree */
if(0!=(drawflags&fDrawFlags::ClusterTree)) DrawClusterTree(psb,idraw);
/* Joints */
if(0!=(drawflags&fDrawFlags::Joints))
{
for(i=0;i<psb->m_joints.size();++i)
{
const btSoftBody::Joint* pj=psb->m_joints[i];
switch(pj->Type())
{
case btSoftBody::Joint::eType::Linear:
{
const btSoftBody::LJoint* pjl=(const btSoftBody::LJoint*)pj;
const btVector3 a0=pj->m_bodies[0].xform()*pjl->m_refs[0];
const btVector3 a1=pj->m_bodies[1].xform()*pjl->m_refs[1];
idraw->drawLine(pj->m_bodies[0].xform().getOrigin(),a0,btVector3(1,1,0));
idraw->drawLine(pj->m_bodies[1].xform().getOrigin(),a1,btVector3(0,1,1));
drawVertex(idraw,a0,0.25,btVector3(1,1,0));
drawVertex(idraw,a1,0.25,btVector3(0,1,1));
}
break;
case btSoftBody::Joint::eType::Angular:
{
//const btSoftBody::AJoint* pja=(const btSoftBody::AJoint*)pj;
const btVector3 o0=pj->m_bodies[0].xform().getOrigin();
const btVector3 o1=pj->m_bodies[1].xform().getOrigin();
const btVector3 a0=pj->m_bodies[0].xform().getBasis()*pj->m_refs[0];
const btVector3 a1=pj->m_bodies[1].xform().getBasis()*pj->m_refs[1];
idraw->drawLine(o0,o0+a0*10,btVector3(1,1,0));
idraw->drawLine(o0,o0+a1*10,btVector3(1,1,0));
idraw->drawLine(o1,o1+a0*10,btVector3(0,1,1));
idraw->drawLine(o1,o1+a1*10,btVector3(0,1,1));
break;
}
default:
{
}
}
}
}
}