add assimp workaround and instructions in README

Makefile

@@ -23,6 +23,14 @@ SOURCES := $(SRCDIR)/main.cpp
 OBJECTS := $(patsubst $(SRCDIR)/%.cpp, $(OBJDIR)/%.o, $(SOURCES))
 BIN := $(BINDIR)/orbital_shipping
 
+# NOTE: Fixes an issue on Fedora where the default assimp version doesn't
+# 	support glTF2
+ifeq ($(USE_INTERNAL_ASSIMP), y)
+$(info using internal assimp)
+CXXFLAGS += -I$(ASSIMP_DIR)/include
+LDFLAGS := -lSDL2 -lGLEW -lGL -L$(ASSIMP_DIR)/lib -lassimp
+endif
+
 
 all: mkdirs $(BIN) $(TEST_BIN)
 .PHONY: all

README

@@ -7,17 +7,34 @@ Dependencies:
 		https://github.com/catchorg/Catch2/blob/devel/docs/Readme.md
 
 TODO:
-	add git submodule for libTangerine
-	try out Catch2 for testing: https://github.com/catchorg/Catch2
+	add GUI to demo application for modifying orbit parameters
+	add equations for parabolic and hyperbolic trajectories
+	make algorithm for Hohmann transfer orbits
 	you know, make the actual game
 
 Building:
 	install dependencies for your environment:
-		eg) $ sudo pacman -S assimp glew glm sdl2 catch2 gcc make
+		Arch) $ sudo pacman -S assimp glew glm sdl2 catch2 gcc make
+		Fedora) $ sudo dnf install assimp-devel glew-devel glm-devel \
+			SDL2-devel catch-devel gcc-c++ make
 	checkout, and initialise submodule dependencies:
-		$ git submodule init
-		$ git submodule update --recursive
+		$ git submodule update --init --recursive
 	build:
 		$ make
 
 	binaries will be in ./bin
+
+	NOTE: if you get errors regarding assimp when building, you can build a
+		recent version of assimp with the instructions here:
+		https://gitlab.com/cinnaboot/tangerine
+
+		For example after doing the git submodule commands above do:
+
+		$ cd ext/tangerine
+		$ make build_assimp && USE_INTERNAL_ASSIMP=y make
+
+		then, to run the demo,
+
+		$ cd ../../bin
+		$ LD_LIBRARY_PATH=../ext/tangerine/ext/assimp/lib ./orbital_shipping
+