Performance tests on big models did not indicate any performance penalty in using doubles over floats,
so the move to doubles should mainly impact precision improvements for whole earth databases.
Also made improvements to osgUtil::PlaneIntersector and osgSim::ElevationSlice classes
Under this mode, each 4x4 texel block can selectively use an alpha component or none. When alpha-enabled blocks are present, this is not reported in the DDPF_ALPHAPIXELS bit in the pixel format flags causing the reader-writer to report the file as a 3-components file (GL_COMPRESSED_RGB_S3TC_DXT1_EXT). The fix requires looking at each 4x4 texel block to detect the presence of 1-bit alpha encoding. When such a block is found, the internal & pixel formats are reported as GL_COMPRESSED_RGBA_S3TC_DXT1_EXT instead.
See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/directx9_c/Opaque_and_1_Bit_Alpha_Textures.asp for more information."
following improvements:
- When all unsupported entities (SOLIDS, TEXT, ...) have been filtered out
from a block, dxfInsert::drawScene() was crashing because it assumed that
the block was not empty. It now returns silently so the other blocks can
still be imported.
- The DXF reader assumed all vertices were read first, then the face
indices. But, from the DXF "documentation" (www.autodesk.com/dxf) :
"Polyface meshes created with the PFACE command are always generated with
all the vertex coordinate entities first, followed by the face definition
entities. The code within AutoCAD that processes polyface meshes requires
this ordering. Programs that generate polyface meshes in DXF should generate
all the vertices then all the faces. However, programs that read polyface
meshes from DXF should be tolerant of odd vertex and face ordering."
So now the importer ignores the posted number of vertices and face indices,
and uses the size of the lists instead."
- does proper edge detection with the crease angle given in the ac file
- the reader is much more verbose in case of broken files
- no more static variables
- std::stream based
- much faster, up to a factor of 50 for a polygonal test model
- if the file contains polygonal surfaces the loaded geometry is still
polygonal as long as the polygons are convex. Concave polygons are still
tesselated. Rationale: If the user needs triangular models he can throw away
that extra information with the osgUtil::Optimizer himself. But the read step
preserves as much extra information that is contained in the file as
possible. Also the polygonal models look a bit smoother than the triangular
ones.
- a huge cleanup
- the basic parsing logic from the original ac3d developer is untouched
- the writer part is untouched
The tarball contains a replacement for the src/osgPlugins/ac3d directory that
is based on the current CVS (2006-11-13).
I have tested that loader with a osgconv foo.ac /tmp/xx.ive on everyfoo. ac
file I could find (~200 from flightgear and the object database). I also run
my flightgear development with that loader -> here I see the models.
I run valgrind testcases on some selected models."
I've attached a small fix for this.
Cause: uncompressed mipmap handling was done only for RGB pixel format.
Fix: added condition for handling alpha and luminance formats too."
contained an 8-bit color map. The crash occured at line 545:
remap_row(currPtr, inbuf, w, red, green, blue);
Cause: The code was trying to write past the end of the buffer while
doing this remapping. The size of the buffer is determined based on the
value of 'format', which was 1 in this case since bitspersample is
8(indicating a 8-bit color map). The buffer should have been created 3
times as large since that 8-bit value is indexing a 24-bit color.
Fix: I've put in an if statement to set format to 3 if 'photometric'
indicates the tif contains a palette as the output data will always be
24-bit color data in this case."
COLLADA plugin. dae->load will not return DAE_OK the second time a model is loaded, so a
second check for DAE_ERR_COLLECTION_ALREADY_EXISTS has been added."
only DAE instance when it's first needed instead of in the constructor.
This fixes the problem with osgdb_dae.dll not being loaded due to
unwanted ordering of global initialization.
This fix and the previous fix of the COLLADA plugin might be unnecessary
with the latest COLLADA DOM, but since many of us will probably still
use the older version of the DOM, I guess it's better this way.
"
plugin. It was only reading floats & doubles correctly on little
endian systems, which require byte swapping, and not on big
endian systems which don't require any swapping."
ignores the Object records if it's safe to do so. The reader option
preserveObject prevents this optimization.
I have also removed the flat shading attribute set by the Object
record. This flag is only intended for the "Calculate Shading"
operation in Creator."
