Commit Graph

21 Commits

Author SHA1 Message Date
Sergey Sharybin
594ff72bfe Fix T41023: Specific material cause bad render result, different on CPU/GPU
Issue was caused by too much aggressive optimization, which skipped execution
of some nodes leading to an uninitialized memory read in SVM stack.
2014-07-11 18:21:52 +06:00
785f20f8c3 Fix T39793: cycles SVM shading bug with tangled up nodes after recent optimization. 2014-04-21 17:17:52 +02:00
04a10907dc Code cleanup: remove old closure sampling code Cycles.
This was the original code to get things working on old GPUs, but now it is no
longer in use and various features in fact depend on this to work correctly to
the point that enabling this code is too buggy to be useful.
2014-04-21 16:14:37 +02:00
bd03e4cfe8 Cycles volume: detect homogeneous volume automatically in common cases.
In practice this means that if you don't connect a texture to your volume nodes
it will figure that out and render the node faster, rather than you having to
specify it manually.

Main weakness is custom OSL nodes where we have to assume it is heterogeneous
because we don't know what kind of data the node accesses.
2014-04-03 22:13:05 +02:00
e9227c76d4 Fix T37706: avoid cycles crash when using a stack that exceeds SVM stack limits.
This should be pretty rare, the shader in question had many parallel node links
because of copying the nodes many times, which is inefficient to run anyway.
2014-01-16 22:36:30 +01:00
Thomas Dinges
d539bd4672 Cycles / Sky Texture:
* Added a new sky model by Hosek and Wilkie: "An Analytic Model for Full Spectral Sky-Dome Radiance" http://cgg.mff.cuni.cz/projects/SkylightModelling/ 

Example render:
http://archive.dingto.org/2013/blender/code/new_sky_model.png
Documentation:
http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes/Textures#Sky_Texture

Details:
* User can choose between the older Preetham and the new Hosek / Wilkie model via a dropdown. For older files, backwards compatibility is preserved. When we add a new Sky texture, it defaults to the new model though. 
* For the new model, you can specify the ground albedo (see documentation for details). 
* Turbidity now has a UI soft range between 1 and 10, higher values (up to 30) are still possible, but can result in weird colors or black. 
* Removed the limitation of 1 sky texture per SVM stack. (Patch by Lukas Tönne, thanks!)

Thanks to Brecht for code review and some help! 

This is part of my GSoC 2013 project, SVN merge of r59214, r59220, r59251 and r59601.
2013-08-28 14:11:28 +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
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
Brecht Van Lommel
adbd84c320 Fix #34121: OSL + persistent images option was not freeing shader memory properly,
causing memory to increase continuously during animation render.
2013-02-14 16:11:47 +00:00
Brecht Van Lommel
33f81187fb Fix #33335: cycles SVM closure issue in recent bugfix, incorrectly tagging
node as done.
2012-11-28 19:13:34 +00:00
Brecht Van Lommel
ceed3ef640 Fix #32907: failure rendering a complex node setup, hitting fixed max number
of closures limit. Optimized the code now so it can handle more.

Change SVM mix/add closure handling, now we transform the node graph so that
the mix weights are fed into the closure nodes directly.
2012-11-26 21:59:41 +00:00
Brecht Van Lommel
ed986b62e8 Fix #33152: cycles SVM crash with certain shader nodes setups where closures would
appear multiple times after flattening the mix/add shader part of the graph into a
tree structure.
2012-11-24 14:50:21 +00:00
Brecht Van Lommel
1d8c798188 Cycles: support for motion vector and UV passes.
Most of the changes are related to adding support for motion data throughout
the code. There's some code for actual camera/object motion blur raytracing
but it's unfinished (it badly slows down the raytracing kernel even when the
option is turned off), so that code it disabled still.

Motion vector export from Blender tries to avoid computing derived meshes
when the mesh does not have a deforming modifier, and it also won't store
motion vectors for every vertex if only the object or camera is moving.
2012-04-30 12:49:26 +00:00
Brecht Van Lommel
bbc3d820f4 Cycles: add ColorRamp node. 2012-03-26 12:45:14 +00:00
Brecht Van Lommel
9b8dae71a5 Cycles: support for environment texture "Mirror Ball" projection mode, next to
existing "Equirectangular". This projection is useful to create light probes
from a chrome ball placed in a real scene. It expects as input a photograph of
the chrome ball, cropped so the ball just fits inside the image boundaries.

Example setup with panorama camera and mixing two (poor quality) photographs
from different viewpoints to avoid stretching and hide the photographer:
http://www.pasteall.org/pic/28036
2012-03-08 19:52:58 +00:00
Brecht Van Lommel
508bfebf36 Cycles: another bugfix for mix closure sampling + bump. 2011-09-21 11:54:28 +00:00
Brecht Van Lommel
66b1dfae89 Cycles: tweaks to properties and nodes
* Passes renamed to samples
* Camera lens radius renamed to aperature size/blades/rotation
* Glass and fresnel nodes input is now index of refraction
* Glossy and velvet fresnel socket removed
* Mix/add closure node renamed to mix/add shader node
* Blend weight node added for shader mixing weights

There is some version patching code for reading existing files, but it's not
perfect, so shaders may work a bit different.
2011-09-16 13:14:02 +00:00
Brecht Van Lommel
0a5fcf3da3 Cycles: fix issue with mix shaders, leading to use of uninitialized memory. 2011-09-16 13:00:09 +00:00
Brecht Van Lommel
ebc653463d Cycles:
* Fix missing update when editing objects with emission materials.
* Fix preview pass rendering set to 1 not showing full resolution.
* Fix CUDA runtime compiling failing due to missing cache directory.
* Use settings from first render layer for visibility and material override.

And a bunch of incomplete and still disabled code mostly related to closure
sampling.
2011-09-12 13:13:56 +00:00
Brecht Van Lommel
2996f08f84 Cycles: first batch of windows build fixes, not quite there yet. 2011-05-03 18:29:11 +00:00
Ton Roosendaal
da376e0237 Cycles render engine, initial commit. This is the engine itself, blender modifications and build instructions will follow later.
Cycles uses code from some great open source projects, many thanks them:

* BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs":
http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/
* Open Shading Language for a large part of the shading system:
http://code.google.com/p/openshadinglanguage/
* Blender for procedural textures and a few other nodes.
* Approximate Catmull Clark subdivision from NVidia Mesh tools:
http://code.google.com/p/nvidia-mesh-tools/
* Sobol direction vectors from:
http://web.maths.unsw.edu.au/~fkuo/sobol/
* Film response functions from:
http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
2011-04-27 11:58:34 +00:00