Commit Graph

14 Commits

Author SHA1 Message Date
Brecht Van Lommel
efe7793152 Fix cycles CUDA/OpenCL build error after recent change. 2013-09-04 01:04:14 +00:00
Brecht Van Lommel
60ca0558c0 Fix issue in last subsurface commit with branched path tracing, was rendering too bright. 2013-08-24 15:36:14 +00:00
Brecht Van Lommel
722d0d92ad Cycles: reduce noise using regular path tracing + subsurface scattering with
new cubic and gaussian falloff. Like the branched path tracer, this will now
shade all intersection points instead of using one at random.
2013-08-24 15:02:08 +00:00
Thomas Dinges
8b20dfe60e Cycles:
* Fix Cycles using wrong AA sample values, after integrator renaming.
2013-08-24 00:27:20 +00:00
Brecht Van Lommel
b9ce231060 Cycles: relicense GNU GPL source code to Apache version 2.0.
More information in this post:
http://code.blender.org/

Thanks to all contributes for giving their permission!
2013-08-18 14:16:15 +00:00
Brecht Van Lommel
d43682d51b Cycles: Subsurface Scattering
New features:

* Bump mapping now works with SSS
* Texture Blur factor for SSS, see the documentation for details:
http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes/Shaders#Subsurface_Scattering

Work in progress for feedback:

Initial implementation of the "BSSRDF Importance Sampling" paper, which uses
a different importance sampling method. It gives better quality results in
many ways, with the availability of both Cubic and Gaussian falloff functions,
but also tends to be more noisy when using the progressive integrator and does
not give great results with some geometry. It works quite well for the
non-progressive integrator and is often less noisy there.

This code may still change a lot, so unless you're testing it may be best to
stick to the Compatible falloff function.

Skin test render and file that takes advantage of the gaussian falloff:
http://www.pasteall.org/pic/show.php?id=57661
http://www.pasteall.org/pic/show.php?id=57662
http://www.pasteall.org/blend/23501
2013-08-18 14:15:57 +00:00
Thomas Dinges
5fc6f04fc8 Cycles / SSS:
* Render Passes are now available for Subsurface Scattering (Direct, Indirect and Color pass). 

This is part of my GSoC project, SVN merge of r58587, r58828 and r58835.
2013-08-03 13:12:09 +00:00
Thomas Dinges
9e4914e055 Cycles:
* Revert r57203 (len() renaming)
There seems to be a problem with nVidia OpenCL after this and I haven't figured out the real cause yet. 
Better to selectively enable native length() later, after figuring out what's wrong. 

This fixes [#35612].
2013-06-04 17:20:00 +00:00
Thomas Dinges
c5ed6765b9 Cycles / Math functions:
* Rename some math functions:
len -> length
len_squared -> length_squared
normalize_len -> normalize_length

* This way OpenCL uses its inbuilt length() function, rather than our own. The other two functions have been renamed for consistency. 
* Tested CPU, CUDA and OpenCL compile, should be no functional changes.
2013-06-02 20:39:32 +00:00
Brecht Van Lommel
838949c3e7 Fix #35207: addition to previous fix to avoid OSL getting uninitialized
ray differentials for lighting, which could cause bad texture filtering
artifacts or performance.
2013-05-03 21:34:51 +00:00
Brecht Van Lommel
ed1a08382f Cycles: code refactoring to deduplicate the various BVH traversal variations.
Now there is a single BVH traversal code with #ifdefs for various features.
At runtime it will then select the appropriate variation to use depending if
instancing, hair or motion blur is in use.

This makes scenes without hair render a bit faster, especially after the
minimum width feature was added. It's not the most beautiful code, but we can't
use c++ templates and there were already 4 copies, adding 4 more to handle the
hair case separately would be too much.
2013-04-17 20:07:22 +00:00
Brecht Van Lommel
743552ff2a Fix #34852: multilayer SSS material rendering different in progressive and
non-progressive integrator.
2013-04-03 16:12:13 +00:00
Brecht Van Lommel
5c74e6dae2 Cycles: small code cleanup + fix SSS closure mixed with other closures doing
a bit too much work.
2013-04-02 16:37:28 +00:00
Brecht Van Lommel
de9dffc61e Cycles: initial subsurface multiple scattering support. It's not working as
well as I would like, but it works, just add a subsurface scattering node and
you can use it like any other BSDF.

It is using fully raytraced sampling compatible with progressive rendering
and other more advanced rendering algorithms we might used in the future, and
it uses no extra memory so it's suitable for complex scenes.

Disadvantage is that it can be quite noisy and slow. Two limitations that will
be solved are that it does not work with bump mapping yet, and that the falloff
function used is a simple cubic function, it's not using the real BSSRDF
falloff function yet.

The node has a color input, along with a scattering radius for each RGB color
channel along with an overall scale factor for the radii.

There is also no GPU support yet, will test if I can get that working later.

Node Documentation:
http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes/Shaders#BSSRDF

Implementation notes:
http://wiki.blender.org/index.php/Dev:2.6/Source/Render/Cycles/Subsurface_Scattering
2013-04-01 20:26:52 +00:00