Thanks, I'm learning a lot from this project!
This is more a note for people trying to build this project under Mojave

Here is the stack trace for reference and google search:

undef: _objc_opt_respondsToSelector
undef: _objc_opt_class
undef: _objc_opt_isKindOfClass
Undefined symbols for architecture x86_64:
  "_objc_opt_respondsToSelector", referenced from:
      -[Cocoa_WindowListener handleTouches:withEvent:] in libSDL2.a(SDL_cocoawindow.m.o)
      _Cocoa_CreateWindow in libSDL2.a(SDL_cocoawindow.m.o)
      _Cocoa_SetWindowFullscreen in libSDL2.a(SDL_cocoawindow.m.o)
      -[SDLMessageBoxPresenter showAlert:] in libSDL2.a(SDL_cocoamessagebox.m.o)
      _Cocoa_GL_GetDrawableSize in libSDL2.a(SDL_cocoaopengl.m.o)
      _Cocoa_GetDisplayDPI in libSDL2.a(SDL_cocoamodes.m.o)
      _Cocoa_HandleMouseWheel in libSDL2.a(SDL_cocoamouse.m.o)
      ...
  "_objc_opt_class", referenced from:
      -[SDLWindow sendEvent:] in libSDL2.a(SDL_cocoawindow.m.o)
      -[Cocoa_WindowListener windowWillMove:] in libSDL2.a(SDL_cocoawindow.m.o)
      -[SDLTranslatorResponder insertText:replacementRange:] in libSDL2.a(SDL_cocoakeyboard.m.o)
      -[SDLTranslatorResponder setMarkedText:selectedRange:replacementRange:] in libSDL2.a(SDL_cocoakeyboard.m.o)
  "_objc_opt_isKindOfClass", referenced from:
      -[SDLWindow sendEvent:] in libSDL2.a(SDL_cocoawindow.m.o)
      -[Cocoa_WindowListener windowWillMove:] in libSDL2.a(SDL_cocoawindow.m.o)
      -[SDLTranslatorResponder insertText:replacementRange:] in libSDL2.a(SDL_cocoakeyboard.m.o)
      -[SDLTranslatorResponder setMarkedText:selectedRange:replacementRange:] in libSDL2.a(SDL_cocoakeyboard.m.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
gmake[2]: *** [Spatial.Editor/CMakeFiles/Spatial.Editor.dir/build.make:169: Spatial.Editor/Spatial.Editor] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:231: Spatial.Editor/CMakeFiles/Spatial.Editor.dir/all] Error 2
gmake: *** [Makefile:149: all] Error 2

Describe the bug
I had to make a few changes to make it work, reasons:

• Part of the C++17 library are only available in 10.15+
• SDL2 was building against 10.15

Additional context

• I replaced the references to std::filesystem by https://github.com/gulrak/filesystem (very straightforward)
• Run MACOSX_DEPLOYMENT_TARGET=10.14 conan install .. --build=sdl2 -> This rebuilds sdl using the right SDK
• Then following the official build instructions worked (just had to use cmake --build . --target all instead of ALL_BUILD)

References

• floooh/sokol-samples#50
• https://trac.wxwidgets.org/ticket/18509

$ python3.10 cli.py run-editor

conan export /home/xxxxx/Spatial.Engine/vendor/filament.py filament/1.25.6@spatial/stable

usage: conan export [-h] [-v [V]] [-f FORMAT] [--name NAME] [--version VERSION] [--user USER] [--channel CHANNEL] [-r REMOTE | -nr]
[-l LOCKFILE] [--lockfile-out LOCKFILE_OUT] [--lockfile-partial] [--build-require]
path
conan export: error: unrecognized arguments: filament/1.25.6@spatial/stable
ERROR: Exiting with code: 2

-- [SPATIAL-CLI] The command returned a non-zero response.
There was an error configuring the project.
Make sure you have all system requirements installed.
See the README for more information.

Hi,
This is compiler error:
CMake Error in Spatial.Editor/CMakeLists.txt:
MSVC_RUNTIME_LIBRARY value
'MultiThreadedDebug;VS_DEBUGGER_WORKING_DIRECTORY;D:/OpenSource/Spatial.Engine/out/build/Windows-Release/Spatial.Editor/Debug;VS_DEBUGGER_COMMAND;D:/OpenSource/Spatial.Engine/out/build/Windows-Release/Spatial.Editor/Debug/Spatial.Editor.exe'
not known for this CXX compiler.

My config :

[settings]
os=Windows
os_build=Windows
arch=x86_64
arch_build=x86_64
compiler=msvc
compiler.cppstd=20
compiler.runtime=dynamic
compiler.version=193
build_type=Debug
[options]
[build_requires]
[env]

help me, thanks！

As an user, I'd like to control the world view camera movement with WASD keys.

run python ./setup.py none vs projects was generated, output follow:

conan export F:\OpenSource\Spatial.Engine\vendor\filament.py filament/1.8.1@google/stable

Exporting package recipe
filament/1.8.1@google/stable: The stored package has not changed
filament/1.8.1@google/stable: Exported revision: 504c7aa8c909a5befe7cf44dd624389d

conan export F:\OpenSource\Spatial.Engine\vendor\imgui.py imgui/docking@ocornut/stable

Exporting package recipe
imgui/docking@ocornut/stable: The stored package has not changed
imgui/docking@ocornut/stable: Exported revision: 6df0c59d7c39fa46b2c64dd9000a9a04

• OS: window 10
• vs 2019

.conan/data/v8/10.1.69/spatial/stable/source/depot_tools/.cipd_bin/vpython3: cannot execute: No such file or directory
ERROR: v8/10.1.69@spatial/stable: Error in source() method, line 105
self.run("fetch v8")
ConanException: Error 126 while executing fetch v8
CMake Error at out/build/MacOS-Release/conan.cmake:540 (message):
Conan install failed='1'
Call Stack (most recent call first):
out/build/MacOS-Release/conan.cmake:882 (old_conan_cmake_install)
CMake/SetupConan.cmake:22 (conan_cmake_run)
CMakeLists.txt:8 (include)

-- Configuring incomplete, errors occurred!
See also "/Spatial.Engine/out/build/MacOS-Release/CMakeFiles/CMakeOutput.log".
See also "/Spatial.Engine/out/build/MacOS-Release/CMakeFiles/CMakeError.log".
The command returned a non-zero response

As an user, I'd like to ZOOM with mouse middle button scroll and PAN with middle button pressed.