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Patch by Alfredo de Greef with high quality image texture filters.
This adds 3 new filters:
* SAT: Summed Area Tables. This is like mipmaps, but using somewhat
more memory avoids some artifacts.
* EWA: Ellipitical Weighted Average, anisotropic filter.
* FELINE: Fast elliptical lines for anisotropic texture mapping.
The one change I made to this was to try to fix an alpha/premul
problem, hopefully I didn't break anything, it looks compatible
with the existing filter now for me.
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blocks that were previously missed; and b) greatly increase my
ohloh stats!
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gave black borders.
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that are not being baked (useful for multiple objects)
* Added support for baking alpha, as well as extending alpha margins.
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value that is an offset along the normal when looking for the nearest
face, which allows baking faces further away, e.g. an ID badge onto a
shirt.
Also fixes a bug baking to float images, for things other than
displacement it didn't work sometimes, and a memory leak in the
extend filter.
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This is an extension on the work Brecht already did to implement normal map baking. I've updated the release notes page here with info and pics:
http://www.blender.org/development/current-projects/changes-since-244/render-baking/
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Please read:
http://www.blender3d.org/cms/Imaging.834.0.html
Or in short:
- adding MultiLayer Image support
- recoded entire Image API
- better integration of movie/sequence Images
Was a whole load of work... went down for a week to do this. So, will need
a lot of testing! Will be in irc all evening.
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Here's the full release log with example file.
http://www.blender3d.org/cms/Render_Baking.827.0.html
For people who don't read docs; just press ALT+CTRL+B on a Mesh
with texture faces!
Todos:
- maybe some filter options extra?
- Make normal maps in Tangent space
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The code that generated mipmaps took a real long time to do it... on a
5k x 5k image it took here (no optim, debug compile) 32.5 sec.
Recoded the very old filtering routine, which already brought it down to
2.8 seconds. Then tested if we even need this filtering... in many cases
the images are painted or photographs, which is filtered OK already.
Without the filter, the mipmap timing went down to 0.39 second. :)
http://www.blender.org/bf/filters/index1.html
Here's an example of two 'mips' generated with or without gauss filter.
Note that aliasing in an image remains there... which can be a wanted
effect anyway.
So; added the gauss filter as option in making mipmaps. Also had to
reshuffle the buttons there in a more logical manner.
There's also disabled code in the do_versions to set 'gauss' on in older
files. Will be enabled during release time.
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- Image textures use float colors now, when present. Works for mipmap too,
and for AO skycolor (probes)
- Backbuffer option uses float buffers too. Note that rendering OSA will
resample the backbuffer, filtering it... will need to be solved with the
new composit stage
- LMB sampling in image window now shows float color too
+ bugfix in imbuf, filtering for float buffers had an error.
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- Reading exr images now goes OK. I've unified the code for reading
'half' and 'float' (was nicely possible!). And removed useless copying
of data around.
- Fixed bug in allocating new rects, like for making mipmaps. flag issues.
- filter code accidentally incremented wrong pointer (crash on mipmap too)
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Credits go to Gernot Ziegler, who originally coded EXR support, and to
Austin Benesh for bringing it further. Kent Mein provided a lot of code
for integrating float buffers in Blender imbuf and ImBuf API cleanup,
and provided Make and Scons and static linking.
At this moment; the EXR libraries are a *dependency*, so you cannot get
the Orange branch compiled without having OpenEXR installed. Get the
(precompiled or sources) stuff from www.openexr.com. Current default is
that the headers and lib resides in /user/local/
Several changes/additions/fixes were added:
- EXR code only supported 'half' format (16 bits per channel). I've added
float writing, but for reading it I need tomorrow. :)
- Quite some clumsy copying of data happened in EXR code.
- cleaned up the api calls already a bit, preparing for more advanced
support
- Zbuffers were saved 16 bits, now 32 bits
- automatic adding of .exr extensions went wrong
Imbuf:
- added proper imbuf->flags and imbuf->mall support for float buffers, it
was created for *each* imbuf. :)
- found bugs for float buffers in scaling and flipping. Code there will
need more checks still
- imbuf also needs to be verified to behave properly when no 32 bits
rect exists (for saving for example)
TODO:
- support internal float images for textures, backbuf, AO probes, and
display in Image window
Hope this commit won't screwup syncing with bf-blender... :/
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I just fixed indentation (replaced spaces with tabs where needed) and removed
#include config.h stuff from the above files.
Kent
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8192 pixels.
I dont have a lot of mem here though, so others should test too!
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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
Just need to finish cpp files now :)
Kent
--
mein@cs.umn.edu
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