Commit Graph

31 Commits

Author SHA1 Message Date
Brecht Van Lommel
d0ffbeec73 Cycles OpenCL: a few fixes to get things compiling after kernel changes,
for Apple OpenCL on OS X 10.8 and simple AO render.

Also environment variable CYCLES_OPENCL_TEST can now be set to CPU, GPU,
ACCELERATOR, DEFAULT or ALL values to test particuler devices.
2013-05-09 14:05:40 +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
a5d6820b6d Possible fix for #35198: uninitialized memory access with background multiple
importance sampling + OSL.
2013-05-03 05:24:05 +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
909d64079a Fix #34226: cycles shadow pass got incorrectly influenced by world multiple
importance sampleing.
2013-02-13 16:46:18 +00:00
Brecht Van Lommel
9307565269 Attempted fix for issue with latest CUDA kernel for 32 bit windows/linux/mac,
there seems to be some sort of compiler bug in CUDA toolkit 4.2, uninlining a
few functions seems to avoid it.
2013-02-11 22:41:11 +00:00
Brecht Van Lommel
f6f5d17a50 Fix #33984: cycles shadow pass problem with CUDA. 2013-01-30 17:04:51 +00:00
Brecht Van Lommel
dc0f4b5618 Cycles: make multiple importance sampling for lamps an option per lamp now,
disabled by default for backwards compatibility.
http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Integrator
2013-01-30 15:57:15 +00:00
Brecht Van Lommel
ad10cbf04a Cycles: multiple importance sampling for lamps, which helps reduce noise for
big lamps and sharp glossy reflections. This was already supported for mesh
lights and the background, so lamps should do it too.

This is not for free and it's a bit slower than I hoped even though there is
no extra BVH ray intersection. I'll try to optimize it more later.

* Area lights look a bit different now, they had the wrong shape before.
* Also fixes a sampling issue in the non-progressive integrator.
* Only enabled for the CPU, will test on the GPU later.
* An option to disable this will be added for situations where it does not help.

Same time comparison before/after:
http://www.pasteall.org/pic/show.php?id=43313
http://www.pasteall.org/pic/show.php?id=43314
2013-01-09 21:09:20 +00:00
Brecht Van Lommel
bf25f1ea96 Cycles Hair: refactoring to store curves with the index of the first key and the
number of keys in the curve, rather than curve segments with the indices of two
keys. ShaderData.segment now stores the segment number in the curve.
2013-01-03 12:09:09 +00:00
Stuart Broadfoot
e9ba345c46 New feature
Patch [#33445] - Experimental Cycles Hair Rendering (CPU only)

This patch allows hair data to be exported to cycles and introduces a new line segment primitive to render with.

The UI appears under the particle tab and there is a new hair info node available.

It is only available under the experimental feature set and for cpu rendering.
2012-12-28 14:21:30 +00:00
Brecht Van Lommel
06888b7beb Cycles OSL minor optimizations: recycle shading context, don't do memory
allocations for trace data, avoid some virtual function calls. Only helps
a few percentages.
2012-12-15 10:18:42 +00:00
Brecht Van Lommel
95963289c8 More fixes related to #32900, motion blur with cuda sm 2.0 still disabled. 2012-10-18 12:45:27 +00:00
Brecht Van Lommel
6915394a3b Attempts to fix CUDA issues on sm 2.0 cards, still no luck getting motion blur
working, but this should make it not crash.

Also fix for wrong shutter time, should have been shorter.
2012-10-17 22:48:29 +00:00
Lukas Toenne
95b85a8c37 Revert "Use one context per OSL thread. Not sure if this actually works, but the simple renderer example in OSL does it this way."
This does not actually work: The context must not be shared between threads, but using the same context between different samples actually seems to prevent OSL from switching between shaders. The proper solution would be to ensure memory pooling works correctly.

This reverts commit 69f87e69258d6266dcb20f09f7e3d4021e663432.
2012-09-04 17:28:36 +00:00
Lukas Toenne
6805db676d Use one context per OSL thread. Not sure if this actually works, but the simple renderer example in OSL does it this way. 2012-09-04 08:53:47 +00:00
Brecht Van Lommel
4ba456d175 Cycles: first step for implementation of non-progressive sampler that handles
direct and indirect lighting differently. Rather than picking one light for each
point on the path, it now loops over all lights for direct lighting. For indirect
lighting it still picks a random light each time.

It gives control over the number of AA samples, and the number of Diffuse, Glossy,
Transmission, AO, Mesh Light, Background and Lamp samples for each AA sample.

This helps tuning render performance/noise and tends to give less noise for renders
dominated by direct lighting.

This sampling mode only works on the CPU, and still needs proper tile rendering
to show progress (will follow tommorrow or so), because each AA sample can be quite
slow now and so the delay between each update wil be too long.
2012-06-13 11:44:48 +00:00
Campbell Barton
0fbb6bff27 style cleanup: block comments 2012-06-09 17:22:52 +00:00
Brecht Van Lommel
6548f7efef Cycles: spot lamp support. 2012-06-04 17:17:10 +00:00
Brecht Van Lommel
d64661b507 Cycles: add Ray Length output to Light Path node. This gives the distance travelled
by the last light ray. One use case for this might be to do absorption.

Patch #31232 by Agustin benavidez, see this blog post for details:
http://agus3d.blogspot.com.ar/2012/05/blender-cycles-ray-length-node-output.html
2012-05-02 17:03:46 +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
755f018324 Cycles: shadow pass support. Note that this only takes into account lamps,
emitting objects or world lighting do not contribute to the shadow pass.

Consider this more as a pass useful for some compositing tricks, unlike
other lighting passes this pass can't be used to exactly reconstruct the
combined pass.
2012-03-28 10:39:21 +00:00
Brecht Van Lommel
26d3b873d5 Fix #30009: cycles translucent BSDF + environment importance sampling not
working correct.
2012-01-30 18:34:01 +00:00
Brecht Van Lommel
4fe00cd4f9 Cycles: disable environment importance sampling code for CUDA cards with
compute model < 2.x, to avoid running out of memory in the compiler.
2012-01-26 19:45:59 +00:00
Brecht Van Lommel
f99343d3b8 Cycles: Render Passes
Currently supported passes:
* Combined, Z, Normal, Object Index, Material Index, Emission, Environment,
  Diffuse/Glossy/Transmission x Direct/Indirect/Color

Not supported yet:
* UV, Vector, Mist

Only enabled for CPU devices at the moment, will do GPU tweaks tommorrow,
also for environment importance sampling.

Documentation:
http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Passes
2012-01-25 17:23:52 +00:00
Brecht Van Lommel
5873301257 Sample as Lamp option for world shaders, to enable multiple importance sampling.
By default lighting from the world is computed solely with indirect light
sampling. However for more complex environment maps this can be too noisy, as
sampling the BSDF may not easily find the highlights in the environment map
image. By enabling this option, the world background will be sampled as a lamp,
with lighter parts automatically given more samples.

Map Resolution specifies the size of the importance map (res x res). Before
rendering starts, an importance map is generated by "baking" a grayscale image
from the world shader. This will then be used to determine which parts of the
background are light and so should receive more samples than darker parts.
Higher resolutions will result in more accurate sampling but take more setup
time and memory.

Patch by Mike Farnsworth, thanks!
2012-01-20 17:49:17 +00:00
Brecht Van Lommel
e5f544dd92 Cycles: add transparent shadow support, i.e. shadows through Transparent BSDF
shaders, enabled by default.
2011-10-16 17:54:43 +00:00
Brecht Van Lommel
d5b679253a Cycles:
* Sun, area and point lights with size now supported
* Cast shadow option to disable shadow casting for lamps
* Emission strength of materials tweaked such that setting strength to 1.0
  basically makes the material "shadeless" in that the value of the color
  input will be the resulting color in the image.
2011-10-15 23:49:01 +00:00
Brecht Van Lommel
cdee3435c6 Cycles: internal changes that should have no effect on user level yet, added
shader flags for various purposes, and some code for light types other than
points.
2011-09-27 20:37:24 +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
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