Fix #30543: tessellating ngons with small angles was failing. There was a quite

arbitrary limit of pi/24 for picking 3 vertices to use for computing a normal,
now it uses vertices with the maximum angle between them.

diff --git a/source/blender/blenlib/intern/scanfill.c b/source/blender/blenlib/intern/scanfill.c
index 6a20d8582145d740420322464ff7b80b90de71c7..420481f165bf0a1ca475a7e78d6c577db3231da7 100644 (file)
--- a/source/blender/blenlib/intern/scanfill.c
+++ b/source/blender/blenlib/intern/scanfill.c
@@ -872,30 +872,29 @@ int BLI_edgefill(short mat_nr)
        /* just use the first three different vertices */
        
        /* THIS PART STILL IS PRETTY WEAK! (ton) */
-       
+
        eve= fillvertbase.last;
        len= 0.0;
        v1= eve->co;
        v2= 0;
        eve= fillvertbase.first;
-       limit = a < 5 ? FLT_EPSILON*200 : M_PI/24.0;
+       limit = 1e-8f;
+
        while(eve) {
                if(v2) {
-                       if( compare_v3v3(v2, eve->co, COMPLIMIT)==0) {
+                       if(!compare_v3v3(v2, eve->co, COMPLIMIT)) {
                                float inner = angle_v3v3v3(v1, v2, eve->co);
-                               
-                               if (fabsf(inner-M_PI) < limit || fabsf(inner) < limit) {
-                                       eve = eve->next;
-                                       continue;
-                               }
+                               inner = MIN2(fabsf(inner), fabsf(M_PI - inner));
 
-                               len= normal_tri_v3( norm,v1, v2, eve->co);
-                               if(len != 0.0f) break;
+                               if(inner > limit) {
+                                       limit = inner;
+                                       len= normal_tri_v3(norm, v1, v2, eve->co);
+                               }
                        }
                }
-               else if(compare_v3v3(v1, eve->co, COMPLIMIT)==0) {
+               else if(!compare_v3v3(v1, eve->co, COMPLIMIT))
                        v2= eve->co;
-               }
+
                eve= eve->next;
        }