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ODS projection

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Zeno Rogue 2018-01-28 12:20:21 +01:00
parent 24acdf6b88
commit 29e2589fcb
1 changed files with 123 additions and 2 deletions
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123
rug.cpp
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@ -938,6 +938,66 @@ void getco(rugpoint *m, hyperpoint& h, int &spherepoints) {
extern int besti;
/* these functions are for the ODS projection, used in VR videos */
void cyclefix(ld& a, ld b) {
if(a > b + M_PI) a -= 2 * M_PI;
if(a < b - M_PI) a += 2 * M_PI;
}
ld raddif(ld a, ld b) {
ld d = a-b;
if(d < 0) d = -d;
if(d > 2*M_PI) d -= 2*M_PI;
if(d > M_PI) d = 2 * M_PI-d;
return d;
}
bool ods = false;
ld ipd = 0.1;
bool project_ods(hyperpoint azeq, hyperpoint& h1, hyperpoint& h2, bool eye) {
ld tanalpha = tan(ipd);
if(eye) tanalpha = -tanalpha;
using namespace hyperpoint_vec;
ld d = hypot3(azeq);
ld sindbd = sin(d)/d, cosd = cos(d);
ld x = azeq[0] * sindbd;
ld y = azeq[2] * sindbd;
ld z = azeq[1] * sindbd;
ld t = cosd;
// printf("%10.5lf %10.5lf %10.5lf ", azeq[0], azeq[1], azeq[2]);
// printf(" => %10.5lf %10.5lf %10.5lf %10.5lf", x, y, z, t);
ld cottheta2 = (x*x + y*y - tanalpha*tanalpha*t*t) / (z*z);
// if(cottheta2 < 0) printf(" BAD\n");
if(cottheta2 < 0) return false;
ld theta = atan(sqrt(1 / cottheta2));
for(int i=0; i<2; i++) {
hyperpoint& h = (i ? h1 : h2);
if(i == 1) theta = -theta;
ld x0 = t * tanalpha;
ld y0 = -z / tan(theta);
ld phi = atan2(y, x) - atan2(y0, x0);
ld delta = atan2(z / sin(theta), t / cos(ipd));
h[0] = phi;
h[1] = theta;
h[2] = delta;
// printf(" => %10.5lf %10.5lf %10.5lf", phi, theta, delta);
}
// printf("\n");
return true;
}
void drawTriangle(triangle& t) {
using namespace hyperpoint_vec;
for(int i: {0,1,2}) {
@ -945,6 +1005,59 @@ void drawTriangle(triangle& t) {
if(t.m[i]->dist >= sightrange+.51) return;
}
dt++;
if(ods) {
hyperpoint pts[3];
for(int i=0; i<3; i++)
pts[i] = t.m[i]->getglue()->flat;
hyperpoint hc = (pts[1] - pts[0]) ^ (pts[2] - pts[0]);
double hch = hypot3(hc);
glNormal3f(hc[0]/hch,hc[1]/hch,hc[2]/hch);
bool ok = true;
array<hyperpoint, 6> h;
for(int eye=0; eye<2; eye++) {
if(true) {
for(int i=0; i<3; i++)
ok = ok && project_ods(pts[i], h[i], h[i+3], eye);
if(!ok) return;
for(int i=0; i<6; i++) {
// let Delta be from 0 to 2PI
if(h[i][2]<0) h[i][2] += 2 * M_PI;
// Theta is from -PI/2 to PI/2. Let it be from 0 to PI
h[i][1] += (eye?-1:1) * M_PI/2;
}
}
else {
for(int i=0; i<6; i++)
h[i][0] = -h[i][0],
h[i][1] = -h[i][1],
h[i][2] = 2*M_PI-h[i][2];
}
if(raddif(h[4][0], h[0][0]) < raddif(h[1][0], h[0][0]))
swap(h[1], h[4]);
if(abs(h[1][1] - h[0][1]) > M_PI/2) return;
if(raddif(h[5][0], h[0][0]) < raddif(h[2][0], h[0][0]))
swap(h[5], h[2]);
if(abs(h[2][1] - h[0][1]) > M_PI/2) return;
cyclefix(h[1][0], h[0][0]);
cyclefix(h[2][0], h[0][0]);
cyclefix(h[4][0], h[3][0]);
cyclefix(h[5][0], h[3][0]);
for(int s: {0, 3}) {
int fst = 0, lst = 0;
if(h[s+1][0] < -M_PI || h[s+2][0] < -M_PI) lst++;
if(h[s+1][0] > +M_PI || h[s+2][0] > +M_PI) fst--;
for(int x=fst; x<=lst; x++) for(int i=0; i<3; i++) {
glTexCoord2f(t.m[i]->x1, t.m[i]->y1);
glVertex3f(h[s+i][0] + 2*M_PI*x, h[s+i][1], h[s+i][2]);
}
}
}
return;
}
int spherepoints = 0;
array<hyperpoint,3> h;
for(int i: {0,1,2}) getco(t.m[i], h[i], spherepoints);
@ -1109,7 +1222,10 @@ void drawRugScene() {
ld tanfov = tan(fov * M_PI / 360);
if(rug_perspective) {
if(ods) {
glOrtho(-M_PI, M_PI, -M_PI, M_PI, 0, -M_PI * 2);
}
else if(rug_perspective) {
ld vnear = .001;
ld vfar = 1000;
ld sca = vnear * tanfov / vid.xres;
@ -1549,6 +1665,11 @@ int rugArgs() {
shift(); vertex_limit = argi();
}
else if(argis("-ods")) {
ods = true;
shift(); ipd = argf();
}
else return 1;
return 0;
}