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ads-game:: AdS cross0_cone now takes auto_rotate into account

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Zeno Rogue 2022-10-15 21:37:26 +02:00
parent 38fddfa43f
commit 6e1c32787a
1 changed files with 13 additions and 1 deletions
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14
rogueviz/ads/math.cpp
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@ -148,6 +148,8 @@ cross_result cross0_sim(ads_matrix hz) {
/** 0 = draw time t=0, -1 = take light into account, +1 = predict future */
ld which_cross;
extern bool auto_rotate;
/** Similar as cross0_sim but detects a crossing with the light cone. That is,
* the spacetime event that was (which==-1) or will be (which==+1) seen by
* the frame of reference.
@ -155,6 +157,7 @@ ld which_cross;
cross_result cross0_cone(ads_matrix hz, ld which) {
// we use cross0_sim first to get the appropriate cycle
auto cr = cross0_sim(hz);
hz = hz * chg_shift(cr.shift);
auto uhz = unshift(hz);
@ -175,7 +178,16 @@ cross_result cross0_cone(ads_matrix hz, ld which) {
hyperpoint uhzt = uhz * chg_shift(t) * C0;
uhzt[2] = sqrt(uhzt[2]*uhzt[2] + uhzt[3]*uhzt[3]);
ld z = sqrt(uhzt[2]*uhzt[2] + uhzt[3]*uhzt[3]);
if(auto_rotate) {
tie(uhzt[0], uhzt[1]) =
make_pair(
uhzt[0] * uhzt[3] / z - uhzt[1] * uhzt[2] / z,
uhzt[0] * uhzt[2] / z + uhzt[1] * uhzt[3] / z
);
}
uhzt[2] = z;
uhzt[3] = 0;
return cross_result{uhzt, cr.shift + t};