[Bf-cycles] Cycles Modifications

[Brecht Van Lommel]

Thanks for sending the patch here, I'll have a closer look at it some
time after the release, there's definitely code here that we can use.

Brecht.

On Mon, Feb 13, 2012 at 7:43 PM, DONOTSPAM <do.not.spam at gmx.de> wrote:
>
> Hello,
>
> i add many modifications to cycles trunk Revision 44019 (10.02.2012)
> I am not a active coder - and i search someone who can add this to blender
> trunk.
> I have no supported GPU and i could not test it - i hope it work.
>
> Here is a diff-file created with WinMerge and all Cycles-files
>
> Number of changed files: 34
>
> DOWNLOAD:
> http://www.pasteall.org/blend/11623
> (rename .zip.blend to .zip)
>
> Thread:
> http://blenderartists.org/forum/showthread.php?243186-My-Cycles-Modifications-%28WIP%29&s=7afc8ba4e98bbbb10cf8d2eb5b54a7e2
>
>
>
> =====MODIFICATIONS=====
>
> 1) pixel based sampling instead of frame based sampling
> i create new buffer called "samplemap" for this
> this buffer collect number of samples per pixel
>
> 2) mat_stop (shader) + obj_stop (object) + back_stop (background)
> can used to stop pixel-based path-tracing
> set number of max samples for this
> detection: first ray
> reflections or bounces are not changed
>
> 3) mat_samples (shader) + obj_samples (object)
> can used to render more samples per pass
> detection: first ray
> reflections or bounces are not changed
>
> 4) mat_mask (shader) + obj_mask (object)
> switch for quick mask out (like holdout)
> different result than camera ray visibility
> real pixel based masking!
>
> 5) invert_mask switch
> invert masking logic for whole scene
> quick preview of masked pixels
> can combined with back_stop!
>
> sample file:
> http://www.pasteall.org/blend/11624
>
> 6) color management switch from blender
>
>
>
> =====CODE ISSUES ======
>
> 1) exposure & invert_masks do not sync in interactive mode
> here is something missing in cycles
>
> 2) obj_samples / obj_stop / obj_mask collected in "visibility"
> not so clean, but it was easier to add for me
> someone should change it?
>
> 3) samplemap highest bit is used as STOP_BIT
> so max number of samples should be limited to 0x7FFFFFFF
> here is also no check for max number of samples for each pixel - can done
> easy in "path_trace"
>
> 4) obj_stop & mat_stop - buffers in kernel use also highest bit for
> "masking"
> so since we have also STOP_BIT, i put masking to highest bit too - all flags
> are untouched
>
> 5) i do not add extra passes to blender (like combined):
> "samples" and "stop" - data is hidden for user
> should change someone?
>
> 6) mat_stop & obj_stop & back_stop can produce strange results with DOF
> and/or antialiasing (if stop value is very low)
> this is known - and bit "dirty" - but a great hack to speed up
>
>
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