Mikko Rasa [Sun, 16 Jun 2019 10:15:32 +0000 (13:15 +0300)]
Better checking of the existence of image filepath
Apparently packed images can get funny filepaths like "//../../../../"
in autosaves. Best to check only the basename so there won't be empty
filenames in datafiles.
Mikko Rasa [Tue, 11 Jun 2019 21:07:38 +0000 (00:07 +0300)]
Fix a data corruption issue in mesh exporter
Apparently mathutils.Vector can refer to external data, in this case the
mesh's UV coordinates, which gets deleted with the mesh. Copy the values
to make sure they are retained.
Mikko Rasa [Fri, 7 Jun 2019 23:17:43 +0000 (02:17 +0300)]
Use bezier splines in Animation
Control keyframes can now be added to affect the shape of curves. Zero,
one or two control keyframes can be present between any two regular
keyframes, resulting in a linear, quadratic or cubic segment.
Mikko Rasa [Wed, 5 Jun 2019 22:02:41 +0000 (01:02 +0300)]
Reimplement Animation using splines
Transform interpolation is now performed on individual components rather
than entire matrices. This produces more accurate rotations and later
will allow animations to only affect some components of the transform.
Currently linear splines are used and the slope parameters are ignored.
Pose matrices are also disabled for now because I don't have any suitable
data for testing them. The old implementation was broken in various ways
anyway.
Mikko Rasa [Tue, 4 Jun 2019 10:39:27 +0000 (13:39 +0300)]
Export world transforms for scene objects
The location, rotation and scale properties contain transform components
relative to the somewhat arbitrary basis matrix. Obtain the values from
the world matrix instead. A drawback is that nonuniform or negative
scaling can produce inconsistent results.
Mikko Rasa [Tue, 4 Jun 2019 07:39:17 +0000 (10:39 +0300)]
Add a class to unify loading coordinate transforms
It will also be useful for animations. Euler angles are not the ideal
way of storing rotations but they are relatively easy to understand and
work with. Other rotation types will be added in the future.
Mikko Rasa [Tue, 4 Jun 2019 07:23:39 +0000 (10:23 +0300)]
Do not use the srgb flag for textures that explicitly define storage
Presumably the texture author knows which colorspace the texture uses.
In particular this made it impossible to load non-color textures such
as normal maps which require a linear colorspace if the srgb flag was
set in the containing resource collection.
Mikko Rasa [Sat, 25 May 2019 21:00:54 +0000 (00:00 +0300)]
Fix various issues with constant condition elimination
It used to optimize based on the initial values of variables, ignoring
the fact that they may change between loop iterations. A stop-gap fix
was implemented in 8e14c29, but it prevented optimizations of some
conditionals that could safely have been removed. It also caused the
optimizer to ignore any assignments made to any variables after
declaration when evaluating the loop condition, potentially causing
entire loops to be erroneously removed. Finally, unary expressions were
not being handled so ++ and -- operators did not mark the variable as
modified.
Mikko Rasa [Fri, 24 May 2019 15:27:50 +0000 (18:27 +0300)]
Try to simplify object names when exporting a scene
The exporter now tries to find the longest common prefix for objects
sharing the same prototype and exports the prototype using that name.
This avoids having randomly numbered object names.
Mikko Rasa [Sun, 19 May 2019 23:03:41 +0000 (02:03 +0300)]
Implement material maps for exporting objects with multiple materials
This replaces the material texture feature which was removed earlier. The
principle is similar (store material color values in a texture) but the
maps are global, making it possible for multiple objects to use the same
map.
Mikko Rasa [Thu, 16 May 2019 11:38:27 +0000 (14:38 +0300)]
Make resource handling in the Blender exporter more flexible
All resources are now collected into a dict and referenced or inlined as
necessary. This makes it possible for SceneExporter to see the resources
used by objects and export them to the resource collection as separate
items.
Mikko Rasa [Wed, 15 May 2019 21:42:03 +0000 (00:42 +0300)]
Redesign file writing in the Blender exporter
Instead of writing statements directly to the file as string fragments,
construct an in-memory representation of the exported data first. This
allows it to be manipulated and combined easier.
Mikko Rasa [Sun, 12 May 2019 06:59:53 +0000 (09:59 +0300)]
Only use texunit zero in exporter-generated techniques
It does not make much sense to use anything else without shaders, and
accessing the mesh to find out unit numbers is getting in the way of
some other changes.
Mikko Rasa [Sun, 5 May 2019 13:54:37 +0000 (16:54 +0300)]
Rewrite triangle strip generation in the Blender exporter
The old algorithm had many of the right ideas but was too clever by half
and consequently very complex. Use a simpler score-based algorithm
developed by Tom Forsyth. Also reorder vertices to make memory accesses
to them occur in a more linear fashion.
Options related to cache optimization were removed since there's
no good reason not to optimize.
Mikko Rasa [Sat, 4 May 2019 23:16:22 +0000 (02:16 +0300)]
Explicitly triangulate faces in the Blender exporter
Previously they were implicitly triangulated during strip generation,
with the idea that it would be more flexible. However I have some
doubts of its benefits and existing strip generation algorithms tend
to deal exclusively in triangles.
Mikko Rasa [Sat, 4 May 2019 13:42:34 +0000 (16:42 +0300)]
Improve progress reporting in the Blender exporter
Pushing and popping tasks now makes more sense. The Progress object
always exists but it's possible to suppress reporting (see 9b57666) by
giving it a falsy context. Progress reporting has been added to a few
places that previously lacked it.
Mikko Rasa [Fri, 3 May 2019 17:13:45 +0000 (20:13 +0300)]
Major rework of mesh handling in Blender exporter
All of the preprocessing has been moved out of the MeshExporter class and
into a utility function. This should make it easier for other exporter
classes to use meshes.
Mikko Rasa [Tue, 30 Apr 2019 22:00:22 +0000 (01:00 +0300)]
Move most properties from exporters to the relevant types
These properties pertain to the things being exported and should retain
their values between exports. It's getting especially difficult to
specify object-specific properties when exporting an entire scene.