double find_cylinder_intersection(t_cylinder *cy, t_ray *r)
{
t_vect *abc;
double d;
double rslt;
t_vect *point;
abc = coeff_cylinder(cy, r);
d = pow(abc->y, 2) - abc->x * abc->z;
if (d > 0)
{
rslt = ((-abc->y - sqrt(d)) / abc->x) - 0.000001 > 0 ?
(-abc->y - sqrt(d)) / abc->x - 0.000001 :
(-abc->y + sqrt(d)) / abc->x - 0.000001;
point = vect_add(r->origin, vect_mult(r->direction, rslt));
if (!check_finite_cyl(cy, point))
rslt = -1;
}
else
rslt = -1;
delete_vect(abc);
return (rslt);
}
t_inter *find_cylinders_intersection(t_ray *ray)
{
double mininter;
double inter;
t_vect *normal;
t_color *color;
t_cylinder *c;
mininter = -1;
c = get_scene()->cylinders;
while (c != NULL)
{
inter = find_cylinder_intersection(c, ray);
if (inter > ACCURACY && (inter < mininter || mininter == -1))
{
mininter = inter;
normal = get_normal_at_cylinder(c, vect_add(ray->origin,
vect_mult(ray->direction, inter)));
color = c->color;
}
c = c->next;
}
return (new_inter(normal, mininter, color));
}
color* trace( ray *aray, primitive *scene, int depth, float refr, float *dist,
int shadows ){
intersection *isect;
primitive *prim, *iter;
vector isect_pt, pn, lv, ln, tmpv1, tmpv2;
ray tmpr;
float tmpf1, tmpf2, tmpf3, shade;
color *tmpc;
color *c = (color*)malloc( sizeof( color ) );
if( c == NULL ) {
fprintf( stderr, "*** error: could not allocate color memory\n" );
exit( 1 );
}
c->x = 0.0f;
c->y = 0.0f;
c->z = 0.0f;
isect = intersect( aray, scene );
if( isect == NULL ) {
return c;
}
*dist = isect->dist;
prim = isect->prim;
if( prim->is_light ) {
vect_copy( c, &(isect->prim->mat.col) );
free( isect );
return c;
}
vect_copy( &isect_pt, aray->dir );
vect_multf( &isect_pt, isect->dist );
vect_add( &isect_pt, aray->origin );
prim->normal( prim, &isect_pt, &pn );
iter = scene;
while( iter != NULL ) {
if( iter->is_light ) {
vect_copy( &lv, &iter->center );
vect_sub( &lv, &isect_pt );
vect_copy( &ln, &lv );
vect_normalize( &ln );
shade = calc_shade( iter, &isect_pt, &lv, &ln, scene, shadows );
if( shade > 0.0f ) {
/* determine the diffuse component */
tmpf1 = prim->mat.diffuse;
if( tmpf1 > 0.0f ) {
tmpf2 = vect_dot( &pn, &ln );
if( tmpf2 > 0.0f ) {
tmpf1 *= tmpf2 * shade;
vect_copy( &tmpv1, &prim->mat.col );
vect_mult( &tmpv1, &iter->mat.col );
vect_multf( &tmpv1, tmpf1 );
vect_add( c, &tmpv1 );
}
}
/* determine the specular component */
tmpf1 = prim->mat.specular;
if( tmpf1 > 0.0f ) {
vect_copy( &tmpv1, &pn );
vect_copy( &tmpv2, &ln );
tmpf2 = 2.0f * vect_dot( &ln, &pn );
vect_multf( &tmpv1, tmpf2 );
vect_sub( &tmpv2, &tmpv1 );
tmpf2 = vect_dot( aray->dir, &tmpv2 );
if( tmpf2 > 0.0f ) {
tmpf1 = powf( tmpf2, 20.0f ) * tmpf1 * shade;
vect_copy( &tmpv1, &iter->mat.col );
vect_multf( &tmpv1, tmpf1 );
vect_add( c, &tmpv1 );
}
}
}
}
iter = iter->next;
}
/* calculate reflection */
if( prim->mat.refl > 0.0f && depth < TRACE_DEPTH ) {
vect_copy( &tmpv1, &pn );
vect_multf( &tmpv1, 2.0f * vect_dot( &pn, aray->dir ) );
vect_copy( &tmpv2, aray->dir );
vect_sub( &tmpv2, &tmpv1 );
vect_copy( &tmpv1, &tmpv2 );
vect_multf( &tmpv1, EPSILON );
vect_add( &tmpv1, &isect_pt );
tmpr.origin = &tmpv1;
tmpr.dir = &tmpv2;
tmpc = trace( &tmpr, scene, depth + 1, refr, &tmpf1, shadows );
vect_multf( tmpc, prim->mat.refl );
vect_copy( &tmpv1, &prim->mat.col );
vect_mult( &tmpv1, tmpc );
vect_add( c, &tmpv1 );
free( tmpc );
}
/* calculate refraction */
if( prim->mat.is_refr && depth < TRACE_DEPTH ) {
vect_copy( &tmpv1, &pn );
if( isect->inside ) {
vect_multf( &tmpv1, -1.0f );
}
tmpf1 = refr / prim->mat.refr;
tmpf2 = -( vect_dot( &tmpv1, aray->dir ) );
tmpf3 = 1.0f - tmpf1 * tmpf1 * (1.0f - tmpf2 * tmpf2);
if( tmpf3 > 0.0f ) {
vect_copy( &tmpv2, aray->dir );
vect_multf( &tmpv2, tmpf1 );
vect_multf( &tmpv1, tmpf1 * tmpf2 - sqrtf( tmpf3 ) );
vect_add( &tmpv1, &tmpv2 );
vect_copy( &tmpv2, &tmpv1 );
vect_multf( &tmpv2, EPSILON );
vect_add( &tmpv2, &isect_pt );
tmpr.origin = &tmpv2;
tmpr.dir = &tmpv1;
tmpc = trace( &tmpr, scene, depth + 1, refr, &tmpf1, shadows );
vect_copy( &tmpv1, &prim->mat.col );
vect_multf( &tmpv1, prim->mat.absorb * tmpf1 );
tmpv2.x = expf( -tmpv1.x );
tmpv2.y = expf( -tmpv1.y );
tmpv2.z = expf( -tmpv1.z );
vect_mult( tmpc, &tmpv2 );
vect_add( c, tmpc );
free( tmpc );
}
}
free( isect );
if( c->x > 1.0f ) {
c->x = 1.0f;
}
else if( c->x < 0.0f ) {
c->x = 0.0f;
}
if( c->y > 1.0f ) {
c->y = 1.0f;
}
else if( c->y < 0.0f ) {
c->y = 0.0f;
}
if( c->z > 1.0f ) {
c->z = 1.0f;
}
else if( c->z < 0.0f ) {
c->z = 0.0f;
}
return c;
}
Graph::Graph(const int *cartan,
const std::vector<Word>& gens, //namesake
const std::vector<Word>& v_cogens,
const std::vector<Word>& e_gens,
const std::vector<Word>& f_gens,
const Vect& weights)
{
//define symmetry group relations
std::vector<Word> words = words_from_cartan(cartan);
{
const Logging::fake_ostream& os = logger.debug();
os << "relations =";
for (int w=0; w<6; ++w) {
Word& word = words[w];
os << "\n ";
for (unsigned i=0; i<word.size(); ++i) {
os << word[i];
}
}
os |0;
}
//check vertex stabilizer generators
{
const Logging::fake_ostream& os = logger.debug();
os << "v_cogens =";
for (unsigned w=0; w<v_cogens.size(); ++w) {
const Word& jenn = v_cogens[w]; //namesake
os << "\n ";
for (unsigned t=0; t<jenn.size(); ++t) {
int j = jenn[t];
os << j;
Assert (0<=j and j<4,
"generator out of range: letter w["
<< w << "][" << t << "] = " << j );
}
}
os |0;
}
//check edge generators
{
const Logging::fake_ostream& os = logger.debug();
os << "e_gens =";
for (unsigned w=0; w<e_gens.size(); ++w) {
const Word& edge = e_gens[w];
os << "\n ";
for (unsigned t=0; t<edge.size(); ++t) {
int j = edge[t];
os << j;
Assert (0<=j and j<4,
"generator out of range: letter w["
<< w << "][" << t << "] = " << j );
}
}
os |0;
}
//check face generators
{
const Logging::fake_ostream& os = logger.debug();
os << "f_gens =";
for (unsigned w=0; w<f_gens.size(); ++w) {
const Word& face = f_gens[w];
os << "\n ";
for (unsigned t=0; t<face.size(); ++t) {
int j = face[t];
os << j;
Assert (0<=j and j<4,
"generator out of range: letter w["
<< w << "][" << t << "] = " << j );
}
}
os |0;
}
//build symmetry group
Group group(words);
logger.debug() << "group.ord = " << group.ord |0;
//build subgroup
std::vector<int> subgroup; subgroup.push_back(0);
std::set<int> in_subgroup; in_subgroup.insert(0);
for (unsigned g=0; g<subgroup.size(); ++g) {
int g0 = subgroup[g];
for (unsigned j=0; j<gens.size(); ++j) {
int g1 = group.left(g0,gens[j]);
if (in_subgroup.find(g1) != in_subgroup.end()) continue;
subgroup.push_back(g1);
in_subgroup.insert(g1);
}
}
logger.debug() << "subgroup.ord = " << subgroup.size() |0;
//build cosets and count ord
std::map<int,int> coset; //maps group elements to cosets
ord = 0; //used as coset number
for (unsigned g=0; g<subgroup.size(); ++g) {
int g0 = subgroup[g];
if (coset.find(g0) != coset.end()) continue;
int c0 = ord++;
coset[g0] = c0;
std::vector<int> members(1, g0);
std::vector<int> others(0);
for (unsigned i=0; i<members.size(); ++i) {
int g1 = members[i];
for (unsigned w=0; w<v_cogens.size(); ++w) {
int g2 = group.left(g1, v_cogens[w]);
if (coset.find(g2) != coset.end()) continue;
coset[g2] = c0;
members.push_back(g2);
}
}
}
logger.info() << "cosets table built: " << " ord = " << ord |0;
//build edge lists
std::vector<std::set<int> > neigh(ord);
for (unsigned g=0; g<subgroup.size(); ++g) {
int g0 = subgroup[g];
int c0 = coset[g0];
for (unsigned w=0; w<e_gens.size(); ++w) {
int g1 = group.left(g0, e_gens[w]);
Assert (in_subgroup.find(g1) != in_subgroup.end(),
"edge leaves subgroup");
int c1 = coset[g1];
if (c0 != c1) neigh[c0].insert(c1);
}
}
// make symmetric
for (int c0=0; c0<ord; ++c0) {
const std::set<int>& n = neigh[c0];
for (std::set<int>::iterator c1=n.begin(); c1!=n.end(); ++c1) {
neigh[*c1].insert(c0);
}
}
// build edge table
adj.resize(ord);
for (int c=0; c<ord; ++c) {
adj[c].insert(adj[c].begin(), neigh[c].begin(), neigh[c].end());
}
neigh.clear();
deg = adj[0].size();
logger.info() << "edge table built: deg = " << deg |0;
//define faces
for (unsigned g=0; g<f_gens.size(); ++g) {
const Word& face = f_gens[g];
logger.debug() << "defining faces on " << face |0;
Logging::IndentBlock block;
//define basic face in group
Ring basic(1,0);
// g = 0;
int g0 = 0;
for (unsigned c=0; true; ++c) {
g0 = group.left(g0, face[c%face.size()]);
if (c >= face.size() and g0 == 0) break;
if (in_subgroup.find(g0) != in_subgroup.end() and g0 != basic.back()) {
basic.push_back(g0);
}
}
for (unsigned c=0; c<basic.size(); ++c) {
logger.debug() << " corner: " << basic[c] |0;
}
logger.debug() << "sides/face (free) = " << basic.size() |0;
//build orbit of basic face
std::vector<Ring> faces_g; faces_g.push_back(basic);
FaceRecognizer recognized; recognized(basic);
for (unsigned i=0; i<faces_g.size(); ++i) {
const Ring f = faces_g[i];
for (unsigned j=0; j<gens.size(); ++j) {
//right action of group on faces
Ring f_j(f.size());
for (unsigned c=0; c<f.size(); ++c) {
f_j[c] = group.right(f[c],gens[j]);
}
//add face
if (not recognized(f_j)) {
faces_g.push_back(f_j);
//logger.debug() << "new face: " << f_j |0;
} else {
//logger.debug() << "old face: " << f_j|0;
}
}
}
//hom face down to quotient graph
recognized.clear();
for (unsigned f=0; f<faces_g.size(); ++f) {
const Ring face_g = faces_g[f];
Ring face;
face.push_back(coset[face_g[0]]);
for (unsigned i=1; i<face_g.size(); ++i) {
int c = coset[face_g[i]];
if (c != face.back() and c != face[0]) {
face.push_back(c);
}
}
if (face.size() < 3) continue;
if (not recognized(face)) {
faces.push_back(face);
}
}
}
ord_f = faces.size();
logger.info() << "faces defined: order = " << ord_f |0;
//define vertex coset
std::vector<Word> vertex_coset;
for (unsigned g=0; g<subgroup.size(); ++g) {
int g0 = subgroup[g];
if (coset[g0]==0) vertex_coset.push_back(group.parse(g0));
}
//build geometry
std::vector<Mat> gen_reps(gens.size());
points.resize(ord);
build_geom(cartan, vertex_coset, gens, v_cogens, weights,
gen_reps, points[0]);
std::vector<int> pointed(ord,0);
pointed[0] = true;
logger.debug() << "geometry built" |0;
//build point sets
std::vector<int> reached(1,0);
std::set<int> is_reached;
is_reached.insert(0);
for (unsigned g=0; g<subgroup.size(); ++g) {
int g0 = reached[g];
for (unsigned j=0; j<gens.size(); ++j) {
int g1 = group.right(g0,gens[j]);
if (is_reached.find(g1) == is_reached.end()) {
if (not pointed[coset[g1]]) {
vect_mult(gen_reps[j], points[coset[g0]],
points[coset[g1]]);
pointed[coset[g1]] = true;
}
reached.push_back(g1);
is_reached.insert(g1);
}
}
}
logger.debug() << "point set built." |0;
//build face normals
normals.resize(ord_f);
for (int f=0; f<ord_f; ++f) {
Ring& face = faces[f];
Vect &a = points[face[0]];
Vect &b = points[face[1]];
Vect &c = points[face[2]];
Vect &n = normals[f];
cross4(a,b,c, n);
normalize(n);
/*
Assert1(fabs(inner(a,n)) < 1e-6,
"bad normal: <n,a> = " << fabs(inner(a,n)));
Assert1(fabs(inner(b,n)) < 1e-6,
"bad normal: <n,b> = " << fabs(inner(b,n)));
Assert1(fabs(inner(c,n)) < 1e-6,
"bad normal: <n,b> = " << fabs(inner(c,n)));
*/
}
logger.debug() << "face normals built." |0;
}
VECT surface_height::height_normal_get(int x, int y, MASK_INTERFACE *p_mask,
int mask_x, int mask_y)
{
VECT2DI list[] =
{
VECT2DI( 0, 1),
VECT2DI( 1, 1),
VECT2DI( 1, 0),
VECT2DI( 1,-1),
VECT2DI( 0,-1),
VECT2DI(-1,-1),
VECT2DI(-1, 0),
VECT2DI(-1, 1),
VECT2DI( 0, 1)
};
VECT vects[] =
{
VECT3DF( 0, 0, 1),
VECT3DF( 1, 0, 1),
VECT3DF( 1, 0, 0),
VECT3DF( 1, 0,-1),
VECT3DF( 0, 0,-1),
VECT3DF(-1, 0,-1),
VECT3DF(-1, 0, 0),
VECT3DF(-1, 0, 1),
VECT3DF( 0, 0, 1)
};
int points = (int)(sizeof(list)/sizeof(list[0]));
float height_current = height_get(x, y);
int i;
for(i = 0; i < points; i++) {
tpos ax = x+list[i].x;
tpos ay = y+list[i].y;
if(pixel_valid(ax, ay) && (!p_mask || p_mask->mask_get(mask_x+ax,mask_y+ay))) {
float height = height_get(ax, ay);
vects[i].y = (height - height_current)*pixel_height_range;
vects[i].norm();
}
else {
vects[i].set(FLOAT_UNDEFINED);
}
}
VECT last(0);
for(i = 0; i < points; i++) {
if(vects[i].x != FLOAT_UNDEFINED) {
last = vects[i];
break;
}
}
if(i == points) {
// return some default normal
return(VECT3DF(0,-1,0));
}
VECT normal(0);
for(i = i+1; i < points; i++) {
if(vects[i].x != FLOAT_UNDEFINED) {
VECT3DF tmp = vect_mult(last, vects[i]);
tmp.norm();
normal += tmp;
last = vects[i];
}
}
normal.norm();
return(normal);
}
