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It was only used by opengl render and in fact it needed just to
set DISPLAY_BUFFER_INVALID flag for the image buffer.
In theory it wouldn't make any change to opengl render speed
(because this change just moved rect_from_float from color
management code to image save code). And could not see any speed
changes on my laptop.
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EWA sampling is designed for downsampling images, i.e. scaling down the size of
input image pixels, which happens regularly in compositing. While the standard
sampling methods (linear, cubic) work reasonably well for linear
transformations, they don't yield good results in non-linear cases like
perspective projection or arbitrary displacement. EWA sampling is comparable to
mipmapping, but avoids problems with discontinuities.
To work correctly the EWA algorithm needs partial derivatives of the mapping
functions which convert output pixel coordinates back into the input image
space (2x2 Jacobian matrix). With these derivatives the EWA algorithm
projects ellipses into the input space and accumulates colors over their
area. This calculation was not done correctly in the compositor, only the
derivatives du/dx and dv/dy were calculation, basically this means it only
worked for non-rotated input images.
The patch introduces full derivative calculations du/dx, du/dy, dv/dx, dv/dy for
the 3 nodes which use EWA sampling currently: PlaneTrackWarp, MapUV and
Displace. In addition the calculation of ellipsis area and axis-aligned
bounding boxes has been fixed.
For the MapUV and Displace nodes the derivatives have to be estimated by
evaluating the UV/displacement inputs with 1-pixel offsets, which can still have
problems on discontinuities and sub-pixel variations. These potential problems
can only be alleviated by more radical design changes in the compositor
functions, which are out of scope for now. Basically the values passed to the
UV/Displacement inputs would need to be associated with their 1st order
derivatives, which requires a general approach to derivatives in all nodes.
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inputs.
http://wiki.blender.org/uploads/4/4c/Compo_image_interpolation_borders.png
Problem is that all image buffer reader nodes (RenderLayer, Image,
MovieClip) were clipping pixel coordinates to 0..N range (N being width
or height respectively). Bilinear interpolation works ok then on the
upper-right borders (x, N) and (N, y), since the last (N-1) pixel fades
out to N (background). But the lower-left (x, 0) and (0, y) borders are
not correctly interpolated because the nodes cut off the negative pixels
before the interpolation function can calculate their value.
To fix this, the interpolation functions are now entirely responsible
for handling "out of range" cases, i.e. setting (0,0,0,0) results for
invalid pixels, while also handling interpolation for borders.
Callers should not do pixel range checks themselves, which also makes
the code simpler. Should not have any real performance penalty,
the interpolation functions do this check anyway, so is probably even
slightly faster.
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This patch changes most of the reamining degrees usage in internal code into radians.
I let a few which I know off asside, for reasons explained below - and I'm not sure to have found out all of them.
WARNING: this introduces forward incompatibility, which means files saved from this version won't open 100% correctly
in previous versions (a few angle properties would use radians values as degrees...).
Details:
- Data:
-- Lamp.spotsize: Game engine exposed this setting in degrees, to not break the API here I kept it as such
(using getter/setter functions), still using radians internally.
-- Mesh.smoothresh: Didn't touch to this one, as we will hopefully replace it completely by loop normals currently in dev.
- Modifiers:
-- EdgeSplitModifierData.split_angle, BevelModifierData.bevel_angle: Done.
- Postprocessing:
-- WipeVars.angle (sequencer's effect), NodeBokehImage.angle, NodeBoxMask.rotation, NodeEllipseMask.rotation: Done.
- BGE:
-- bConstraintActuator: Orientation type done (the minloc[0] & maxloc[0] cases). Did not touch to 'limit location' type,
it can also limit rotation, but it exposes through RNA the same limit_min/limit_max, which hence
can be either distance or angle values, depending on the mode. Will leave this to BGE team.
-- bSoundActuator.cone_outer_angle_3d, bSoundActuator.cone_inner_angle_3d: Done (note I kept degrees in BGE itself,
as it seems this is the expected value here...).
-- bRadarSensor.angle: Done.
Reviewers: brecht, campbellbarton, sergey, gaiaclary, dfelinto, moguri, jbakker, lukastoenne, howardt
Reviewed By: brecht, campbellbarton, sergey, gaiaclary, moguri, jbakker, lukastoenne, howardt
Thanks to all!
Differential Revision: http://developer.blender.org/D59
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Changes for VC2013
Now, I can build Blender with VC2013 with Cycles, Collada, OpenExr,OpenImageIO disabled. Also, you need VC2008 sp1 installed to make old libs compatible.
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Previous wrap implementation was based on inverse
bilinear mapping, which doesn't give perspective.
Now plane track wrap estimates perspective transform
matrix as a homography estimation between frame
coordinates and plane corners.
Uses Libmv's implementation for this, which means
plane track wouldn't work properly with Libmv
disabled. Not a deal for official builds at all,
just folks who keeps things disabled need to be
aware of this.
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in SocketReader.
Distinguish the 3 different methods for acquiring pixel color values (executePixel, executePixelSampled, executePixelFiltered).
This makes it easier to keep track of the different sampling methods (and works nicer with IDEs that do code parsing).
Differential Revision: http://developer.blender.org/D7
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LOCK_DRAW_IMAGE used to be unlocked twice. Now made it
so all the thread-unsafe code is inside a single lock/
unlock section.
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offset/power/slope variables for the CDL mode in color balance node. This avoids stupid default values in particular for offset, which would be 1 when just using the lift value for it.
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node. These values were always calculated at execution time, so there is no need to keep them around in DNA data and no forward compatibility break either. Only reason they were stored in DNA before is that the old compositor had no other means of keeping precomputed values around for every pixel than storing the DNA node data, with new compositor this is no longer necessary (values are stored in operations).
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when using an image sequence offset
generally speaking, if multilayer image fails to load for current
frame doesn't mean anything bad. It might be used to make it so
image sequence is being alpha-overed somewhere in the middle of
scene time.
Made it so if the whole file fails to load, image node will
deliver black transparent color, the same what happens for
regular (non-multilayer images).
Also needed to tweak code in load_multilayer_sequwnce to make
sure no cached frames are pointing to a freed memory.
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The RenderLayers node would use the "combined" image result for all passes which don't have a valid render result yet. This causes problems when the buffer element size is not actually 4 floats (RGBA) as
with the 3 float normal passes. Also the result is rather meaningless then, so just keep the image buffer at NULL for unavailable passes, which will return plain (0,0,0) color.
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Thanks to David M (erwin94)
only added some comments.
https://projects.blender.org/tracker/?func=detail&aid=34178&group_id=9&atid=127
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- At Mind -
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Extended the is_active_group flag such that both the current edittree as well as the base node tree in Scene do a viewer node update.
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checks for vectors.
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After discussion with Brecht decided that automatically updating the sockets of the node based on externally modified data (removed EXR file passes) is not desirable behavior. But at least making sure
the correct passes are assigned to the output sockets of the Image node is possible. Now the passes are matched by name instead of using the faulty index stored in the socket data, which is more
reliable. Still may break if changing pass names externally, but an image reload is highly recommended anyway and will fix that.
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MultiEXR mode, because it matches sockets and EXR layers by index and was skipping unconnected sockets. Simply create EXR layer info
for all sockets now and then ignore unconnected layers when finally writing to file in deinitExecution.
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This was own error in r60049 which fixed chunk number calculation. This was mixing int and unsigned int values from ExecutionGroup, which leads to huge chunk numbers which are then skipped.
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Debug code for graphviz output moved to a dedicated file COM_Debug.h/cpp.
The DebugInfo class has only static functions, which are called from a number of places to keep track of what is happening in the compositor. If debugging is disabled these are just inline stubs, so we
don't need #ifdefs everywhere and don't get any overhead.
The graphviz output is much more useful now. DebugInfo keeps track of node names in a static string map for meaningful names. It uses a number of colors for various special operation classes.
ExecutionGroups are indicated in graphviz with clusters.
Currently the graphviz .dot files are stored in the BLI_temporary_dir() folder. A separate dot file is generated for each stage of the ExecutionGroup scheduling, this is intended to give some idea of the
compositor progress, but could still be improved.
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The chunk indices for scheduling chunks based on a given area were calculated incorrectly. This caused chunks at the very border of the render (pixels 256..257) to be omitted, leading to incorrect values
in the Z buffer of the test file, which in turn caused wrong normalization range and the resulting almost-white image.
Also added a dedicated executePixel function for Z buffer to avoid any interpolation of Z values.
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viewer
node should write to the viewer image, the logic to check this was wrong, now made
it the same as the viewer node.
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AA for plane warp node
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- add missing headers from cmake (own omission)
- quiet rna_test.c unused define warnings.
- minor style edits
- spelling corrections and ignore all uppercase words with spell checking script.
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r59820).
Most convert operations can share a common base class with a single socket reader (except channel separate/combine nodes).
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warning in release builds.
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The issue with wrapping is that it requires correct interpolation of the border pixels. Since interpolation is done at the far left end of the node tree in buffer/image/etc read operations, the wrapping
setting can not be used directly in those operations (otherwise in-line translate operations would cause conflicts). To make wrapping work correctly we need to add a buffer in front of the translate
operation, which can then be interpolated correctly based on wrapping. The WrapOperation becomes a variant of ReadBufferOperation, which uses its wrapping setting to determine the correct "extend" mode
for interpolation of the buffer.
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proper interpolation of pixel values when using wrapping in the Translate node. Implemented in inline functions, so won't cause
overhead if constant values are passed (as happens with most calls using the default argument).
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This merges all mix operations into a COM_MixBaseOperation
(naming could be better, but this way it corresponds to what's
going on with math operations.
Same was done with RenderLayers operations.
Overall this gives 20% of bf_compositor library compilation
time decrease. And it was rather annoying to have tens of
files with just a single-line constructors anyway.
TODO:
- All Convert operations could also be merged into a single file,
but that would require adding some ConvertBaseOperation to
reduce code duplication (ideally). Leaving it unchanged for now.
- Some operations' headers seems to be wrongly including MixOperation
header, they need to include NodeOperation instead it seems.
This is rather harmless, but would be nice to doublecheck on this
eventually.
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It was caused by wrong copy-paste thing, which replaced check
"whether alpha channel is enabled" with "whether alpha channel
is not zero" (which is always zero in accumulator).
Compositor always works with RGBA, so no need to do any special
checks here.
TODO: Maybe MapUV ode shall ignore alpha channel?
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the error-string array.
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This disables crazy adaptive sampling happening in diagonal direction.
This still gives some doggyness, but it's much less dramatic now,
and behavior is pretty damn the same as EWA filtering when rendering
textures with Blender Internal.
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