ray:: fixed dark lines in H2xR which happened when we got a=0 in quadratic equation

2022-02-26 09:50:45 +01:00 · 2022-02-26 09:50:45 +01:00 · 015006546e
parent 80b9d9533c
commit 015006546e
1 changed files with 1 additions and 0 deletions
--- a/raycaster.cpp
+++ b/raycaster.cpp
@ -451,6 +451,7 @@ void raygen::compute_which_and_dist(int flat1, int flat2) {
          "mediump float zsgn = (Mt > 0. ? -sgn : sgn);\n"
          "mediump float u = sqrt(b*b-c)*zsgn + b;\n"
          "mediump float v = -(Mp*u-1.) / Mt;\n"
+          "if(a < 1e-5) v = (1.-Mp*Mp) / (2. * Mt);\n"
          "mediump float d = asinh(v);\n";
      if(prod) fmain += "d /= xspeed;\n";
      fmain +=