Mesh split, bogeys follow rails.

Wow. This commit is too big. It:

* splits obj loaded meshes into individual named objects.
* moves obj to mesh(es) code into new file obj.impl.cpp, removing the
  clutter from mesh
* removes Physical for providing the wrong level of abstraction
* bit of a hack to adjust loaded models to offset rail vehicle bogeys to
  0 centre, and then applies their calculated position to the mesh

All in all, quite a lot of mess... But the result is the rail vehicle
bogeys now follow the rails quite authentically.

1 files changed, 0 insertions, 37 deletions

diff --git a/game/physical.h b/game/physical.h
deleted file mode 100644
index 5fdc253..0000000
--- a/game/physical.h
+++ /dev/null
@@ -1,37 +0,0 @@
-#ifndef PHYSICAL_H
-#define PHYSICAL_H
-
-#include <gfx/gl/transform.h>
-#include <gfx/renderable.h>
-#include <glm/glm.hpp>
-#include <memory>
-#include <string>
-
-class Shader;
-class Mesh;
-class Texture;
-template<typename Obj> class Cache;
-
-class Physical : public Renderable {
-public:
-	Physical(glm::vec3 where, const std::string & m, const std::string & t);
-
-	void render(const Shader & shader) const override;
-
-	[[nodiscard]] const auto &
-	getLocation() const
-	{
-		return location;
-	}
-
-protected:
-	Transform location;
-
-	std::shared_ptr<Mesh> mesh;
-	std::shared_ptr<Texture> texture;
-
-private:
-	static Cache<Mesh> cachedMesh;
-};
-
-#endif