FBX files may use a texture reference from an embedded texture that hasn't been loaded yet. This patch fixes this issue, storing all texture filenames, that can be acessed later via "scene::GetEmbeddedTexture", when all textures are already loaded.
Some warnings have been added to other file formats that uses embedded data.
mainly unused parameter and unused function
some parameters are indeed used in a debug built, I used the
(void)(param) trick
warnings reported by clang 4
Fixed a bug where FBX loader won´t load embedded textures that don´t have the Content data filled. Some FBX files only fill this data once, so any embedded texture with the same source filename, should use the pre-loaded data.
Fixed another bug where FBX Texture "Filename" field came different than on some files than the one defined by the code. One suggestion is load all properties by the case-insensitive function created.
Added the "AI_CONFIG_IMPORT_FBX_SEARCH_EMBEDDED_TEXTURES" flag to tell the importer to load embedded texture data from already loaded ones.
Fbx cameras are stored in the scene graph as well as having separate camera properties.
The separate camera properties have a camera position and direction that is already fully
transformed based on its position in the scene graph so this results in the assimp
camera being transformed twice. Since the scene graph contains all the relevant
transformations the camera position and direction can just use default values. Fbx
specifies cameras along the positive x axis so the default camera values have a up and
direction set accordingly.
Fixes: #807#643
Fbx lights are stored in the scene graph as well as having separate light properties.
The separate light properties have a light position and direction that is already fully
transformed based on its position in the scene graph so this results in the assimp
light being transformed twice. Since the scene graph contains all the relevant
transformations the light position and direction can just use default values. Fbx
specifies lights along the negative y axis so the default light values have a up and
direction set accordingly.
The DecayStart value specifies the distance from the light that the light intensity
will drop to half. Using the default assimp falloff equation of f=1/c+lr+qr^2 then
the falloff coefficients can be calculated for either c,l or q accordingly by setting
r=DecayStart and f=0.5.
Fixes#851
