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printable rug

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This commit is contained in:
Zeno Rogue 2020-04-15 17:07:39 +02:00
parent de5c64d080
commit db916f8c95
3 changed files with 71 additions and 2 deletions
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1
drawing.cpp
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@ -35,6 +35,7 @@ static const int POLY_TRIANGLES = (1<<22); // made of TRIANGLES, not TRIANG
static const int POLY_INTENSE = (1<<23); // extra intense colors
static const int POLY_DEBUG = (1<<24); // debug this shape
static const int POLY_PRINTABLE = (1<<25); // these walls are printable
static const int POLY_FAT = (1<<26); // fatten this model in WRL export (used for Rug)
/** \brief A graphical element that can be drawn. Objects are not drawn immediately but rather queued.
*

2
rug.cpp
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@ -1076,7 +1076,7 @@ EX void drawRugScene() {
rug.V = rugView;
rug.offset_texture = 0;
rug.tinf = &tinf;
rug.flags = POLY_TRIANGLES;
rug.flags = POLY_TRIANGLES | POLY_FAT | POLY_PRINTABLE;
dynamicval<eModel> p(pmodel, rug_projection);

70
screenshot.cpp
View File

@ -244,6 +244,8 @@ EX always_false in;
EX bool print;
EX ld rug_width = .01;
fhstream f;
string coord(ld val) {
@ -265,6 +267,68 @@ EX always_false in;
return buf;
}
typedef unsigned long long hashtype;
hashtype hash(ld x) { return hashtype(x * 1000000 + .5); }
hashtype hash(hyperpoint h) {
return hash(h[0]) + 7 * hash(h[1]) + 13 * hash(h[2]);
}
EX void fatten(vector<hyperpoint>& data) {
map<hashtype, hyperpoint> normals;
for(int i=0; i<isize(data); i++)
normals[hash(data[i])] = Hypc;
for(int i=0; i<isize(data); i++) {
int j = i%3 ? i-1 : i+2;
int k = j%3 ? j-1 : j+2;
hyperpoint normal = (data[j] - data[i]) ^ (data[k] - data[i]);
normal[3] = 0;
if(sqhypot_d(3, normal) < 1e-6) {
println(hlog, "bug ", tie(data[i], data[j], data[k]));
}
normal /= hypot_d(3, normal);
auto& res = normals[hash(data[i])];
ld q = res[3];
if((res | normal) < 0) res -= normal;
else res += normal;
res[3] = q + 1;
}
for(auto& p: normals) {
auto w = hypot_d(3, p.second);
if(w == 0) println(hlog, "width is 0, ", p.second, " appeared ", p.second[3], " times");
if(isnan(w)) println(hlog, "width is NAN, ", p.second, " appeared ", p.second[3], " times");
p.second = p.second * (rug_width / w);
}
vector<hyperpoint> data2;
for(int i=0; i<isize(data); i+=3) {
auto a = data[i], b = data[i+1], c = data[i+2];
hyperpoint normal = (b-a) ^ (c-a);
auto na = normals[hash(a)];
auto nb = normals[hash(b)];
auto nc = normals[hash(c)];
if((normal | na) > 0) na = -na;
if((normal | nb) > 0) nb = -nb;
if((normal | nc) > 0) nc = -nc;
bool bad = false;
for(int i=0; i<3; i++) {
if(isnan(na[i]) || isnan(nb[i]) || isnan(nc[i])) bad = true;
}
if(bad) {
println(hlog, "bad vertex");
continue;
}
data2.push_back(a+na); data2.push_back(b+nb); data2.push_back(c+nc);
data2.push_back(b+nb); data2.push_back(a+na); data2.push_back(a-na);
data2.push_back(b+nb); data2.push_back(a-na); data2.push_back(b-nb);
data2.push_back(c+nc); data2.push_back(b+nb); data2.push_back(b-nb);
data2.push_back(c+nc); data2.push_back(b-nb); data2.push_back(c-nc);
data2.push_back(a+na); data2.push_back(c+nc); data2.push_back(c-nc);
data2.push_back(a+na); data2.push_back(c-nc); data2.push_back(a-na);
data2.push_back(b-nb); data2.push_back(a-na); data2.push_back(c-nc);
}
data = data2;
}
EX void polygon(dqi_poly& p) {
if(print && !(p.flags & POLY_PRINTABLE)) return;
if(!(p.flags & POLY_TRIANGLES)) return;
@ -288,7 +352,11 @@ EX always_false in;
h = p.V * d;
applymodel(h, d);
}
if(print) {
if(print && (p.flags & POLY_FAT)) {
fatten(data);
p.cnt = isize(data);
}
else if(print) {
hyperpoint ctr1;
applymodel(p.V * p.intester, ctr1);
ld sdet = 0;