Implement Nature Reality Engine: TreeRenderer, L-system, 3D mesh, wind physics, seasonal changes

.gitignore

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+# Build output
+build/

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+project(NatureRealityEngine CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# ---------------------------------------------------------------------------
+# Engine library
+# ---------------------------------------------------------------------------
+
+add_library(nre_engine STATIC
+    engine/nature/LSystem.cpp
+    engine/nature/TreeRenderer.cpp
+)
+
+target_include_directories(nre_engine PUBLIC
+    ${CMAKE_SOURCE_DIR}
+)
+
+target_compile_options(nre_engine PRIVATE
+    $<$<CXX_COMPILER_ID:GNU,Clang,AppleClang>:-Wall -Wextra -Wpedantic>
+    $<$<CXX_COMPILER_ID:MSVC>:/W4>
+)
+
+# ---------------------------------------------------------------------------
+# Artemis demo executable
+# ---------------------------------------------------------------------------
+
+add_executable(artemis_demo
+    examples/artemis_demo/main.cpp
+)
+
+target_link_libraries(artemis_demo PRIVATE nre_engine)
+
+# ---------------------------------------------------------------------------
+# Tests
+# ---------------------------------------------------------------------------
+
+enable_testing()
+
+add_executable(test_lsystem tests/test_lsystem.cpp)
+target_link_libraries(test_lsystem PRIVATE nre_engine)
+add_test(NAME LSystemTests COMMAND test_lsystem)
+
+add_executable(test_treerenderer tests/test_treerenderer.cpp)
+target_link_libraries(test_treerenderer PRIVATE nre_engine)
+add_test(NAME TreeRendererTests COMMAND test_treerenderer)