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- removed "using" directive in .hpp
- reverse order of arguments for quaternion rotation, i.e. q.rot(v)
instead of v.rot(q), where q is a quaterinon and v a vector
- pass the inverse of the view matrix to render_and_present_frame, to
allow light calculation in shaders (we used to just pass the matrix of
the quaternion of the transformation, i.e. discard scaling and
translations)
- added another mesh and texture (viking_room) for testing purposes
- added transparent background option
- added Quaternion::look_towards(), which is the equivalent of
Matrix4::look_at() but only for rotations
- various improvement to .obj parsing
- load texture coordinates from .obj file
- merged duplicate vertices in Mesh::linearize_indices()
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- refactored scene_main to be able to share code between software and
hardware renderers, while still sharing code between terminal software
renderer and graphical software renderer
- made the hardware renderer use scene objects vertices and transforms,
instead of hardcoded ones
- made the hardware renderer use the scene's camera
- made .obj parser create Vector3 instead of Vector4, which didn't made
sense
- removed unnecessary std::
- lots of small changes
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