Hi,

Since I'm not knowledgeable about NetRadiant code and C in general, I asked Claude to help trace this — sorry if LLM are not your cup of tea (which I'd understand).

Anyway, Claude seems to confirm what I've observed:

RadSubdivideDiffuseLight() used to take a qboolean original parameter: qtrue only on the initial (un-subdivided) call from RadLightForTriangles()/RadLightForPatch(), and qfalse on every recursive subdivision call. The point backsplash was gated behind if ( original && si->backsplashFraction > 0 ).

Since the function subdivides before reaching that check, any surface exceeding diffuseSubdivide (256 units by default, or q3map_lightSubdivide) in some axis recursed immediately with original == qfalse, so none of its resulting fragments ever got a backsplash — only small, already-fitting surfaces did.

Commit ed4c8c20 (2017-08-02, the one introducing Jelvan's area-light backsplash) dropped this original parameter entirely from the function signature, so backsplash is now created on every subdivided fragment instead of only on the original whole surface. !210 (merged) restored the point-light algorithm but not this original gating, since that logic had been removed from the function itself, not just swapped out.

Thanks for the report!

It seems that point backsplash was once applied only to small light-emitting surfaces, but is now applied to all surfaces, even large ones.

Was there code to disable backsplash from some surface?

It seems that point backsplash was once applied only to small light-emitting surfaces, but is now applied to all surfaces, even large ones.

For example, we didn't get these artefacts in old builds of Afterslime:
♦

Point light backsplash had been removed in ed4c8c20 in favour of area light backsplash, then later reintroduced in !210 (merged)

But perhaps it was the old behaviour (disabling the backsplash for large surfaces) that was considered a bug?

More examples with the following Xonotic map: test2.map

• With NetRadiant 20220628 and backsplash: ♦
• With current NetRadiant and the default backsplash values: ♦
• With current NetRadiant and -backsplash 0 0 ♦

This tool also allows you to search for entities.

Spike29 (0535cebb) at 01 Sep 16:56

Rename "Find brush" to "Find Entity/Brush" in the menu and in the d...

rasalgul said it is OpenBSD, not FreeBSD. For now only FreeBSD has been tested.

FreeBSD build error on CRN. Reported by rasalgul on #radiant on QuakeNet:

Script started on Fri Aug 14 23:24:17 2026
localhost$ gmake


[  1%] Built target l_net
[  8%] Built target h2data
[ 15%] Built target q2map
[ 16%] Built target xmllib
[ 17%] Built target mapxml
[ 18%] Built target imagehl
[ 19%] Built target ddslib
[ 19%] Building CXX object libs/crnrgba/CMakeFiles/crnrgba.dir/crn_rgba.cpp.o
c++: warning: argument unused during compilation: '-L/usr/local/lib/babl-0.1' [-Wunused-command-line-argument]
c++: warning: argument unused during compilation: '-L/usr/local/lib' [-Wunused-command-line-argument]
c++: warning: argument unused during compilation: '-L/usr/X11R6/lib' [-Wunused-command-line-argument]
c++: warning: argument unused during compilation: '-L/usr/local/lib/python3.8' [-Wunused-command-line-argument]
In file included from /mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/crn_rgba.cpp:31:
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_decomp.h:483:8: warning: inline variables are a C++17 extension [-Wc++17-extensions]
static inline uint16_t swap16(uint16_t x) {
       ^
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_decomp.h:483:31: error: unexpected type name 'uint16_t': expected expression
static inline uint16_t swap16(uint16_t x) {
                              ^
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_decomp.h:483:31: error: unexpected type name 'uint16_t': expected expression
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_decomp.h:483:31: error: unexpected type name 'uint16_t': expected expression
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_decomp.h:483:31: error: unexpected type name 'uint16_t': expected expression
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_decomp.h:483:42: error: expected ';' after top level declarator
static inline uint16_t swap16(uint16_t x) {
                                         ^
                                         ;
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_decomp.h:1949:31: error: use of undeclared identifier 'malloc_usable_size'
      *pActual_size = p_new ? malloc_usable_size(p_new) : 0;
                              ^
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_decomp.h:1981:25: error: no member named 'malloc_usable_size' in the global namespace
      *pActual_size = ::malloc_usable_size(p_final_block);
                      ~~^
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_decomp.h:1996:14: error: use of undeclared identifier 'malloc_usable_size'
  return p ? malloc_usable_size(p) : 0;
             ^
In file included from /mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/crn_rgba.cpp:31:
In file included from /mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_decomp.h:16:
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:234:56: warning: array index 2 is past the end of the array (which contains 2 elements) [-Warray-bounds]
        return (m_buf[0] << 16U) | (m_buf[1] << 8U) | (m_buf[2]);
                                                       ^     ~
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_decomp.h:2203:7: note: in instantiation of member function 'crnd::crn_packed_uint<2>::operator unsigned int' requested here
  if (file_header.m_sig != crn_header::cCRNSigValue)
      ^
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:240:3: note: array 'm_buf' declared here
  unsigned char m_buf[N];
  ^
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:236:57: warning: array index 2 is past the end of the array (which contains 2 elements) [-Warray-bounds]
        return (m_buf[0] << 24U) | (m_buf[1] << 16U) | (m_buf[2] << 8U) | (m_buf[3]);
                                                        ^     ~
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:240:3: note: array 'm_buf' declared here
  unsigned char m_buf[N];
  ^
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:236:76: warning: array index 3 is past the end of the array (which contains 2 elements) [-Warray-bounds]
        return (m_buf[0] << 24U) | (m_buf[1] << 16U) | (m_buf[2] << 8U) | (m_buf[3]);
                                                                           ^     ~
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:240:3: note: array 'm_buf' declared here
  unsigned char m_buf[N];
  ^
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:232:35: warning: array index 1 is past the end of the array (which contains 1 element) [-Warray-bounds]
        return (m_buf[0] << 8U) | m_buf[1];
                                  ^     ~
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_decomp.h:2233:8: note: in instantiation of member function 'crnd::crn_packed_uint<1>::operator unsigned int' requested here
  if ((pHeader->m_faces != 1) && (pHeader->m_faces != 6))
       ^
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:240:3: note: array 'm_buf' declared here
  unsigned char m_buf[N];
  ^
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:234:37: warning: array index 1 is past the end of the array (which contains 1 element) [-Warray-bounds]
        return (m_buf[0] << 16U) | (m_buf[1] << 8U) | (m_buf[2]);
                                    ^     ~
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:240:3: note: array 'm_buf' declared here
  unsigned char m_buf[N];
  ^
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:234:56: warning: array index 2 is past the end of the array (which contains 1 element) [-Warray-bounds]
        return (m_buf[0] << 16U) | (m_buf[1] << 8U) | (m_buf[2]);
                                                       ^     ~
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:240:3: note: array 'm_buf' declared here
  unsigned char m_buf[N];
  ^
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:236:37: warning: array index 1 is past the end of the array (which contains 1 element) [-Warray-bounds]
        return (m_buf[0] << 24U) | (m_buf[1] << 16U) | (m_buf[2] << 8U) | (m_buf[3]);
                                    ^     ~
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:240:3: note: array 'm_buf' declared here
  unsigned char m_buf[N];
  ^
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:236:57: warning: array index 2 is past the end of the array (which contains 1 element) [-Warray-bounds]
        return (m_buf[0] << 24U) | (m_buf[1] << 16U) | (m_buf[2] << 8U) | (m_buf[3]);
                                                        ^     ~
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:240:3: note: array 'm_buf' declared here
  unsigned char m_buf[N];
  ^
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:236:76: warning: array index 3 is past the end of the array (which contains 1 element) [-Warray-bounds]
        return (m_buf[0] << 24U) | (m_buf[1] << 16U) | (m_buf[2] << 8U) | (m_buf[3]);
                                                                           ^     ~
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:240:3: note: array 'm_buf' declared here
  unsigned char m_buf[N];
  ^
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:236:76: warning: array index 3 is past the end of the array (which contains 3 elements) [-Warray-bounds]
        return (m_buf[0] << 24U) | (m_buf[1] << 16U) | (m_buf[2] << 8U) | (m_buf[3]);
                                                                           ^     ~
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_decomp.h:2247:40: note: in instantiation of member function 'crnd::crn_packed_uint<3>::operator unsigned int' requested here
    pFile_info->m_total_palette_size = pHeader->m_color_endpoints.m_size + pHeader->m_color_selectors.m_size + pHeader->m_alpha_endpoints.m_size + pHeader->m_alpha_selectors.m_size;
                                       ^
/mnt/924G/DATA/CLIPS/maps/netradiant/libs/crnrgba/../crunch/crn_defs.h:240:3: note: array 'm_buf' declared here
  unsigned char m_buf[N];
  ^
11 warnings and 8 errors generated.
gmake[2]: *** [libs/crnrgba/CMakeFiles/crnrgba.dir/build.make:76: libs/crnrgba/CMakeFiles/crnrgba.dir/crn_rgba.cpp.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:1254: libs/crnrgba/CMakeFiles/crnrgba.dir/all] Error 2
gmake: *** [Makefile:156: all] Error 2
localhost$ exit



Script done on Fri Aug 14 23:24:24 2026

Okay, I'll wait for the update.

I'll try to reproduce your error…

Again, the same error. Why it keep looking for a missing gtkglext package? The gtkglext was built-in, yes?

Yes, that's very weird… Also we see the builtin build actually installs the gtkglext-win32-1.0.pc file in the right place, but then in the netradiant build the pkgconfig claims to fail to find it…

I've done a clean build, no remnants or residual files/folders left, but still yield the same result.

♦

Again, the same error. Why it keep looking for a missing gtkglext package? The gtkglext was built-in, yes?

Yep, I did use the easy-builder script.

Let me see if that directory exists.

Also, in case it remembers something from your previous attempts, make sure to delete the build/ directory before building, if you have not done it first.

Did you use the easy-builder script?

♦

I've got an error at the end. Is it normal?

Thomas Debesse (087f512e) at 28 Jul 20:10

readme: more generic updates

... and 8 more commits

Thomas Debesse (a8f9ef70) at 28 Jul 14:53

readme: more generic updates

... and 8 more commits

Thomas Debesse (c1593b31) at 28 Jul 14:47

readme: more generic updates

... and 1 more commit

Hi @Overwatch-C-17! Try this illwieckz/windows-gtkglext branch:

• Rework the MSYS2 build after GtkGLExt MSYS2 removal (build GtkGLExt as a builtin) !247

Follow those instructions (in the URT64 MSYS2 shell):

pacman -S --needed base-devel git subversion unzip autoconf automake libtool \
  mingw-w64-ucrt-$(uname -m)-{ntldd-git,toolchain,cmake,make,gtk2,gtk-doc,libwebp,minizip-git}

git clone gitlab.com/xonotic/netradiant.git
cd netradiant
git fetch origin
git checkout illwieckz/windows-gtkglext
./easy-builder

You should then get a working NetRadiant in netradiant/install/.

More details here:

• Rework the MSYS2 build after GtkGLExt MSYS2 removal (build GtkGLExt as a builtin) !247

This builds GtkGLExt as a builtin, from the only remaining repository being maintained today (by me):

• gitlab.gnome.org/illwieckz/gtkglext/-/tree/windows

If you get some garbage displayed at first run, restart NetRadiant. Some drivers can be picky with the very old OpenGL used in NetRadiant. If you get consistent garbage, I can redirect you to some alternate OpenGL libraries for Windows to drop in the NetRadiant folder to get NetRadiant working.