Use std::optional for options

README.md

@@ -9,7 +9,7 @@ F3D (pronounced `/fɛd/`) is a fast and minimalist 3D viewer desktop application
 
 It is fully controllable from the command line and support configuration files. It can provide thumbnails, support interactive hotkeys, drag&drop and integration into file managers.
 
-F3D also contains the libf3d, a simple library to render meshes, with C++ and Python Bindings, as well as experimental Java and Javascript bindings.
+F3D also contains the libf3d, a simple library to render meshes, with a C++17 API, Python Bindings, and experimental Java and Javascript bindings.
 
 <img src="https://user-images.githubusercontent.com/3129530/194735416-3f386437-456c-4145-9b5e-6bb6451d7e9a.png" width="640">
 

application/F3DOptionsTools.cxx

@@ -82,7 +82,7 @@ static inline const std::array<CLIGroup, 8> CLIOptions = {{
       { "up", "", "Up direction", "{-X, +X, -Y, +Y, -Z, +Z}", "" },
       { "axis", "x", "Show axes", "<bool>", "1" }, { "grid", "g", "Show grid", "<bool>", "1" },
       { "grid-absolute", "", "Position grid at the absolute origin instead of below the model", "<bool>", "1" },
-      { "grid-unit", "", "Size of grid unit square, set to a non-positive value for automatic computation", "<value>", "" },
+      { "grid-unit", "", "Size of grid unit square, automatically computed by default", "<value>", "" },
       { "grid-subdivisions", "", "Number of grid subdivisions", "<value>", "" },
       { "grid-color", "", "Color of main grid lines", "<R,G,B>", "" },
       { "edges", "e", "Show cell edges", "<bool>", "1" },
@@ -97,10 +97,11 @@ static inline const std::array<CLIGroup, 8> CLIOptions = {{
       {"font-file", "", "Path to a FreeType compatible font file", "<file_path>", ""} } },
   { "Material",
     { {"point-sprites", "o", "Show sphere sprites instead of geometry", "<bool>", "1" },
-      {"point-type", "", "Point sprites type when showing point sprites", "<sphere|gaussian>", ""},
-      {"point-size", "", "Point size when showing vertices or point sprites", "<size>", ""},
-      {"line-width", "", "Line width when showing edges", "<width>", ""},
-      {"backface-type", "", "Backface type, can be default (usually visible), visible or hidden", "<default|visible|hidden>", ""},
+      {"point-sprites-type", "", "Point sprites type", "<sphere|gaussian>", ""},
+      {"point-sprites-size", "", "Point sprites size", "<size>", ""},
+      {"point-size", "", "Point size when showing vertices, model specified by default", "<size>", ""},
+      {"line-width", "", "Line width when showing edges, model specified by default", "<width>", ""},
+      {"backface-type", "", "Backface type, can be visible or hidden, model specified by default", "<visible|hidden>", ""},
       {"color", "", "Solid color", "<R,G,B>", ""},
       {"opacity", "", "Opacity", "<opacity>", ""},
       {"roughness", "", "Roughness coefficient (0.0-1.0)", "<roughness>", ""},
@@ -130,7 +131,7 @@ static inline const std::array<CLIGroup, 8> CLIOptions = {{
       {"coloring-array", "", "Name of the array to color with", "<array_name>", "" },
       {"comp", "y", "Component from the array to color with. -1 means magnitude, -2 or the short option, -y, means direct scalars", "<comp_index>", "-2"},
       {"cells", "c", "Use an array from the cells", "<bool>", "1"},
-      {"range", "", "Custom range for the coloring by array", "<min,max>", ""},
+      {"range", "", "Custom range for the coloring by array, automatically computed by default", "<min,max>", ""},
       {"bar", "b", "Show scalar bar", "<bool>", "1" },
       {"colormap-file", "", "Specify a colormap image", "<filePath/filename/fileStem>", ""},
       {"colormap", "", "Specify a custom colormap (ignored if \"colormap-file\" is specified)", "<color_list>", ""},
@@ -390,8 +391,7 @@ std::pair<std::string, int> F3DOptionsTools::GetClosestOption(const std::string&
   // Check libf3d option names
   if (checkLib)
   {
-    f3d::options opt;
-    for (const std::string& key : opt.getNames())
+    for (const std::string& key : f3d::options::getAllNames())
     {
       checkDistance(key, option, ret);
     }
@@ -450,7 +450,9 @@ F3DOptionsTools::OptionsDict F3DOptionsTools::ParseCLIOptions(
             if (libIter != F3DOptionsTools::LibOptionsNames.end())
             {
               f3d::options opt;
-              defaultValue = opt.getAsString(std::string(libIter->second));
+              std::string name = std::string(libIter->second);
+              // let default value empty for unset options
+              defaultValue = opt.isSet(name) ? opt.getAsString(name) : "";
             }
           }
 

application/F3DOptionsTools.h

@@ -79,7 +79,8 @@ static inline const std::map<std::string_view, std::string_view> LibOptionsNames
   { "animation-frame-rate", "scene.animation.frame_rate" },
   { "font-file", "ui.font_file" },
   { "point-sprites", "model.point_sprites.enable" },
-  { "point-type", "model.point_sprites.type" },
+  { "point-sprites-type", "model.point_sprites.type" },
+  { "point-sprites-size", "model.point_sprites.size" },
   { "point-size", "render.point_size" },
   { "line-width", "render.line_width" },
   { "backface-type", "render.backface_type" },

application/F3DStarter.cxx

@@ -957,11 +957,14 @@ void F3DStarter::LoadFile(int index, bool relativeIndex)
   // Detect interactively changed options and store them into the dynamic options dict
   // options names are shared between options instance
   F3DOptionsTools::OptionsDict dynamicOptionsDict;
-  std::vector<std::string> optionNames = this->Internals->LibOptions.getNames();
+  std::vector<std::string> optionNames = dynamicOptions.getSetNames();
   for (const auto& name : optionNames)
   {
     if (!dynamicOptions.isSame(this->Internals->LibOptions, name))
     {
+      // XXX Currently an assert is enough but it should be a proper try/catch once
+      // we add a mechanism to unset an option
+      assert(dynamicOptions.isSet(name));
       dynamicOptionsDict[name] = dynamicOptions.getAsString(name);
     }
   }

application/testing/CMakeLists.txt

@@ -126,7 +126,7 @@ f3d_test(NAME TestVTS DATA bluntfin.vts)
 f3d_test(NAME TestVTM DATA mb.vtm)
 f3d_test(NAME TestVTK DATA cow.vtk)
 f3d_test(NAME TestNRRD DATA beach.nrrd ARGS -s)
-f3d_test(NAME TestSPLAT DATA small.splat ARGS -osy --up=-Y --point-size=1)
+f3d_test(NAME TestSPLAT DATA small.splat ARGS -osy --up=-Y --point-sprites-size=1)
 f3d_test(NAME TestGridX DATA suzanne.ply ARGS -g --up=+X)
 f3d_test(NAME TestGridY DATA suzanne.ply ARGS -g --up=+Y)
 f3d_test(NAME TestGridZ DATA suzanne.ply ARGS -g --up=+Z)
@@ -137,9 +137,9 @@ f3d_test(NAME TestGridColor DATA suzanne.ply ARGS -g --grid-color=1,1,1)
 f3d_test(NAME TestAxis DATA suzanne.ply ARGS -x)
 f3d_test(NAME TestBackfaceVisible DATA backface.vtp ARGS --backface-type=visible)
 f3d_test(NAME TestBackfaceHidden DATA backface.vtp ARGS --backface-type=hidden)
-f3d_test(NAME TestPointCloud DATA pointsCloud.vtp ARGS -o --point-size=20)
-f3d_test(NAME TestPointCloudBar DATA pointsCloud.vtp ARGS -sob --point-size=20)
-f3d_test(NAME TestPointCloudUG DATA pointsCloud.vtu ARGS -o --point-size=20)
+f3d_test(NAME TestPointCloud DATA pointsCloud.vtp ARGS -o --point-sprites-size=20)
+f3d_test(NAME TestPointCloudBar DATA pointsCloud.vtp ARGS -sob --point-sprites-size=20)
+f3d_test(NAME TestPointCloudUG DATA pointsCloud.vtu ARGS -o --point-sprites-size=20)
 f3d_test(NAME TestPointCloudVolume DATA bluntfin.vts ARGS -sob)
 f3d_test(NAME TestPointCloudDefaultScene DATA pointsCloud.vtp ARGS --point-size=20)
 f3d_test(NAME Test3DSImporter DATA iflamigm.3ds ARGS --up=+Z)
@@ -287,7 +287,7 @@ endif()
 # Needs splat sorting with compute shaders
 if(VTK_VERSION VERSION_GREATER_EQUAL 9.3.20240203)
   if(NOT APPLE) # MacOS does not support compute shaders
-    f3d_test(NAME Test3DGaussiansSplatting DATA small.splat ARGS -osy --up=-Y --point-size=1 --point-type=gaussian --camera-position=-3.6,0.5,-4.2)
+    f3d_test(NAME Test3DGaussiansSplatting DATA small.splat ARGS -osy --up=-Y --point-sprites-size=1 --point-sprites-type=gaussian --camera-position=-3.6,0.5,-4.2)
     f3d_test(NAME TestDefaultConfigFileSPLAT DATA small.splat CONFIG config_build LONG_TIMEOUT)
     f3d_test(NAME TestThumbnailConfigFileSPLAT DATA small.splat CONFIG thumbnail_build LONG_TIMEOUT)
   endif()
@@ -612,8 +612,11 @@ if(F3D_PLUGIN_BUILD_EXODUS)
   f3d_test(NAME TestAnimationTimeLimitsHigh DATA small.ex2 ARGS ARGS --load-plugins=exodus --animation-time=10)
   f3d_test(NAME TestAnimationTimeLimitsLow DATA small.ex2 ARGS ARGS --load-plugins=exodus --animation-time=-5)
 
+  # Test if negative range is respected when loading a file without specifying the animation time
+  f3d_test(NAME TestTimeRangeLessThanZeroNoAnimationTime DATA negative_range_animated.e ARGS -s --load-plugins=exodus)
+
   # Test if the animation-time works when set to zero and time range[0] is less than zero
-  f3d_test(NAME TestTimeRangeLessThanZero DATA negative_range_animated.e ARGS -s --load-plugins=exodus --animation-time=0)
+  f3d_test(NAME TestTimeRangeLessThanZeroWithAnimationTime DATA negative_range_animated.e ARGS -s --load-plugins=exodus --animation-time=0)
 
   # Test if a negative animation-time works when time range[0] is less than zero
   f3d_test(NAME TestTimeRangeLessThanZeroNegativeAnimationTime DATA negative_range_animated.e ARGS -s --load-plugins=exodus --animation-time=-3)
@@ -721,7 +724,7 @@ f3d_test(NAME TestInteractionCycleCell DATA waveletArrays.vti INTERACTION) #VCCC
 f3d_test(NAME TestInteractionCycleComp DATA dragon.vtu INTERACTION) #SYYYY
 f3d_test(NAME TestInteractionCycleScalars DATA dragon.vtu INTERACTION) #BSSSS
 f3d_test(NAME TestInteractionVolumeInverse DATA HeadMRVolume.mhd ARGS --camera-position=127.5,-400,127.5 --camera-view-up=0,0,1 INTERACTION) #VI
-f3d_test(NAME TestInteractionPointCloud DATA pointsCloud.vtp ARGS --point-size=20 INTERACTION) #O
+f3d_test(NAME TestInteractionPointCloud DATA pointsCloud.vtp ARGS --point-sprites-size=20 INTERACTION) #O
 f3d_test(NAME TestInteractionDirectory DATA mb INTERACTION ARGS --scalar-coloring) #Right;Right;Right;Left;Up;
 f3d_test(NAME TestInteractionDirectoryLoop DATA mb INTERACTION ARGS --scalar-coloring) #Left;Left;Left;
 f3d_test(NAME TestInteractionDirectoryEmpty DATA mb INTERACTION NO_DATA_FORCE_RENDER) #Right;Right;Right;
@@ -821,7 +824,7 @@ f3d_test(NAME TestVerboseDebug DATA dragon.vtu ARGS --verbose REGEXP "Number of
 f3d_test(NAME TestVerboseInvalid DATA dragon.vtu ARGS --verbose=invalid REGEXP "Unrecognized verbose level" NO_BASELINE)
 
 # Unknown scalar array verbosity test
-f3d_test(NAME TestVerboseWrongArray DATA dragon.vtu ARGS -s --coloring-array=dummy --verbose REGEXP "Unknown scalar array: dummy" NO_BASELINE)
+f3d_test(NAME TestVerboseWrongArray DATA dragon.vtu ARGS -s --coloring-array=dummy --verbose REGEXP "Unknown scalar array: \"dummy\"" NO_BASELINE)
 
 # Default scalar array verbosity test
 f3d_test(NAME TestVerboseDefaultScalar DATA HeadMRVolume.mhd ARGS -s --verbose REGEXP "Coloring using point array named MetaImage, Magnitude" NO_BASELINE)
@@ -864,6 +867,12 @@ f3d_test(NAME TestVerboseVolumeNoArray DATA cow.vtp ARGS -v REGEXP "Cannot use v
 # Test scalar rendering without any array
 f3d_test(NAME TestVerboseNoArray DATA cow.vtp ARGS -s --verbose=debug REGEXP "No array to color with" NO_BASELINE)
 
+# Test invalid scalar range
+f3d_test(NAME TestInvalidScalarsRange DATA suzanne.ply ARGS -s --coloring-array=Normals --comp=1 --range=0,1,2 REGEXP "Invalid scalar range provided, using automatic range" NO_BASELINE)
+
+# Test invalid backface type
+f3d_test(NAME TestInvalidBackface DATA backface.vtp ARGS --backface-type=invalid REGEXP "is not a valid backface type, assuming it is not set" NO_BASELINE)
+
 # Test non existent file, do not create nonExistentFile.vtp
 f3d_test(NAME TestVerboseNonExistentFile DATA nonExistentFile.vtp REGEXP "File .*nonExistentFile.vtp does not exist" NO_RENDER)
 

cmake/f3dOptions.cmake

@@ -98,17 +98,22 @@ function(_parse_json_option _top_json)
     # Read the json element
     string(JSON _cur_json GET ${_top_json} ${_member_name})
     # Recover its type and default if it is a leaf option
-    string(JSON _option_type ERROR_VARIABLE _type_error GET ${_cur_json} "type")
-    string(JSON _option_default_value ERROR_VARIABLE _default_value_error GET ${_cur_json} "default_value")
-    if(_type_error STREQUAL "NOTFOUND" AND _default_value_error STREQUAL "NOTFOUND")
+    string(JSON _option_type ERROR_VARIABLE _option_type_error GET ${_cur_json} "type")
+    string(JSON _option_type_type ERROR_VARIABLE _option_type_type_error TYPE ${_cur_json} "type")
+    if(_option_type_error STREQUAL "NOTFOUND" AND ${_option_type_type} STREQUAL "STRING")
        # Leaf option found!
+
+       # Recover default_value if any
+       string(JSON _option_default_value ERROR_VARIABLE _default_value_error GET ${_cur_json} "default_value")
+
        set(_option_name "${_option_basename}${_member_name}")
 
        # Identify types
        set(_option_actual_type ${_option_type})
        set(_option_variant_type ${_option_type})
        set(_option_default_value_start "")
        set(_option_default_value_end "")
+
        if(_option_type STREQUAL "double_vector")
          set(_option_actual_type "std::vector<double>")
          set(_option_variant_type "std::vector<double>")
@@ -125,11 +130,21 @@ function(_parse_json_option _top_json)
        endif()
 
        # Add option to struct and methods
-       string(APPEND _options_struct "${_option_indent}  ${_option_actual_type} ${_member_name} = ${_option_default_value_start}${_option_default_value}${_option_default_value_end};\n")
+
+       if(_default_value_error STREQUAL "NOTFOUND")
+         # Use default_value
+         string(APPEND _options_struct "${_option_indent}  ${_option_actual_type} ${_member_name} = ${_option_default_value_start}${_option_default_value}${_option_default_value_end};\n")
+         set(_optional_getter "")
+       else()
+         # No default_value, it is an std::optional
+         string(APPEND _options_struct "${_option_indent}  std::optional<${_option_actual_type}> ${_member_name};\n")
+         set(_optional_getter ".value()")
+       endif()
+
        list(APPEND _options_setter "if (name == \"${_option_name}\") opt.${_option_name} = std::get<${_option_variant_type}>(value)")
-       list(APPEND _options_getter "if (name == \"${_option_name}\") return opt.${_option_name}")
+       list(APPEND _options_getter "if (name == \"${_option_name}\") return opt.${_option_name}${_optional_getter}")
        list(APPEND _options_string_setter "if (name == \"${_option_name}\") opt.${_option_name} = options_tools::parse<${_option_actual_type}>(str)")
-       list(APPEND _options_string_getter "if (name == \"${_option_name}\") return options_tools::format(opt.${_option_name})")
+       list(APPEND _options_string_getter "if (name == \"${_option_name}\") return options_tools::format(opt.${_option_name}${_optional_getter})")
        list(APPEND _options_lister "\"${_option_name}\"")
 
     else()

doc/GALLERY.md

@@ -17,7 +17,7 @@ Images and videos displayed below use public datasets, you can download them [he
 
 <video src='https://media.githubusercontent.com/media/f3d-app/f3d-media/main/media/counter.webm' autoplay="autoplay" loop="loop" width="700"></video>
 
-*3D Gaussians Splatting*: `f3d counter.splat --point-size=1 --point-type=gaussian -soynxz --up=-Y --camera-position=0,1,-5.2 --camera-focal-point=0,1,0`
+*3D Gaussians Splatting*: `f3d counter.splat --point-sprites-size=1 --point-sprites-type=gaussian -soynxz --up=-Y --camera-position=0,1,-5.2 --camera-focal-point=0,1,0`
 
 <img src="https://user-images.githubusercontent.com/3129530/194735272-5bcd3e7c-a333-41f5-8066-9b0bec9885e8.png" width="700">