From 74906727c60c4cc27287d9baac5f9f8a1e79c148 Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Sun, 3 Oct 2021 18:06:15 +0200
Subject: [PATCH] intra:: Solv portalsP

---
 intra.cpp     | 34 +++++++++++++++++++++++++++++-----
 raycaster.cpp | 22 +++++++++++++++++++++-
 2 files changed, 50 insertions(+), 6 deletions(-)

diff --git a/intra.cpp b/intra.cpp
index 4202c8fe..0464074f 100644
--- a/intra.cpp
+++ b/intra.cpp
@@ -63,8 +63,13 @@ hyperpoint portal_data::to_poco(hyperpoint h) const {
     h[3] = 1;
     return h;
     }
-  else if(hyperbolic && bt::in())
-    return T * bt::minkowski_to_bt(h);
+  else if(hyperbolic && bt::in()) {
+    h = T * bt::minkowski_to_bt(h);
+    for(int i: {0,1,2}) h[i] *= (log(2)/2);
+    return h;
+    }
+  else if(sol)
+    return T * h;
   else {
     h = T * h;
     h /= h[3];
@@ -88,8 +93,12 @@ hyperpoint portal_data::from_poco(hyperpoint h) const {
     h[3] = 1;
     return iT * h * exp(h0[1]);
     }
-  else if(hyperbolic && bt::in())
+  else if(hyperbolic && bt::in()) {
+    for(int i: {0,1,2}) h[i] *= (2/log(2));
     return bt::bt_to_minkowski(iT * h);
+    }
+  else if(sol)
+    return iT * h;
   else {
     h[3] = 1;
     return normalize(iT * h);
@@ -101,6 +110,7 @@ EX portal_data make_portal(cellwalker cw, int spin) {
   auto fac = ss.faces[cw.spin];
   portal_data id;
   id.scale = 1;
+  auto gg = geometry;
   if(prod && cw.spin == cw.at->type - 1) {
     id.kind = 1;
     id.d = product_decompose(fac[0]).first;
@@ -125,8 +135,13 @@ EX portal_data make_portal(cellwalker cw, int spin) {
       println(hlog, kz(h), " -> ", kz(spintox(id.v0)*h), " -> ", kz(cpush(0, -hdist0(id.v0))) * kz(spintox(id.v0) * h), " -> ", kz(id.to_poco(h)));
       }
     }
-  else if(hyperbolic && bt::in()) {
-    if(isize(fac) == 5) fac.erase(fac.begin() + 1);
+  else if(bt::in()) {
+    for(int i=0; i<isize(fac); i++) {
+      int i1 = i+1; if(i1 >= isize(fac)) i1 = 0;
+      int i2 = i1+1; if(i2 >= isize(fac)) i2 = 0;
+      if(hypot_d(3, 2*fac[i1] - fac[i] - fac[i2]) < 1e-3)
+        fac.erase(fac.begin()+i1);
+      }
     id.kind = 0;
     id.v0 = Hypc;
     id.T = Id;
@@ -142,6 +157,15 @@ EX portal_data make_portal(cellwalker cw, int spin) {
         id.T = cspin(2, 1, 90*degree) * id.T;
       }
     if((id.T * C03)[2] > 0) id.T = cspin(2, 0, 180*degree) * id.T;
+    vector<hyperpoint> v;
+    geometry = gg;
+    for(auto f: fac) v.push_back(id.to_poco(final_coords(f)));
+    geometry = gCubeTiling;
+    ld sca = 1;
+    for(int i=0; i<isize(v); i++)
+      sca *= sqhypot_d(3, v[i] - v[(1+i) % isize(v)]);
+    sca = pow(sca, .5 / isize(v));
+    id.scale = sca / 2;
     }
   else {
     id.kind = 0;
diff --git a/raycaster.cpp b/raycaster.cpp
index 7c97c998..89d82e8a 100644
--- a/raycaster.cpp
+++ b/raycaster.cpp
@@ -1012,7 +1012,16 @@ void raygen::emit_intra_portal(int gid1, int gid2) {
       "    mediump vec4 nposition = position + tangent * 1e-3;\n"
       "    mediump mat4 tkt = " + getM("mid+1") + ";\n"
       "    position = tkt * minkowski_to_bt(position);\n"
-      "    nposition = tkt * minkowski_to_bt(nposition);\n";
+      "    nposition = tkt * minkowski_to_bt(nposition);\n"
+      "    position.xyz *= " + glhr::to_glsl(log(2)/2) + ";\n"
+      "    nposition.xyz *= " + glhr::to_glsl(log(2)/2) + ";\n";
+    }
+  else if(sol) {
+    fmain +=
+      "    mediump vec4 nposition = position + tangent * 1e-3;\n"
+      "    mediump mat4 tkt = " + getM("mid+1") + ";\n"
+      "    position = tkt * position;\n"
+      "    nposition = tkt * nposition;\n";
     }
   else {
     fmain +=
@@ -1076,6 +1085,15 @@ void raygen::emit_intra_portal(int gid1, int gid2) {
       }
     fmain += "}\n";
     }
+  else if(sol) {
+    fmain +=
+   "    mediump mat4 itkt = " + getM("mid+2") + ";\n";
+    fmain +=
+   "    position = itkt * position;\n"
+   "    nposition = itkt * nposition;\n"
+   "    tangent = (nposition - position) * 1e3;\n"
+   "    float next = maxstep;\n";
+    }
   else {
     fmain +=
     "    mediump mat4 itkt = " + getM("mid+2") + ";\n";
@@ -1084,6 +1102,8 @@ void raygen::emit_intra_portal(int gid1, int gid2) {
       string sgn = hyperbolic ? "-" : "+";
       if(hyperbolic && bt::in()) {
         fmain +=
+       "    position.xyz *= " + glhr::to_glsl(2/log(2)) + ";\n"
+       "    nposition.xyz *= " + glhr::to_glsl(2/log(2)) + ";\n"
        "    position = bt_to_minkowski(itkt * position);\n"
        "    nposition = bt_to_minkowski(itkt * nposition);\n";
          }