Hi Costa,
Are we suppose to be "Porting" these primitives the(RHC, ARB4, DSP,
EXTRUDE etc) from its current rendering structure to OpenCL?
Is there any compatible issues with moving these primitives to OpenCL?
In order to "Port" these pimitives are we going to just "read in" their
extensions to OpenCL?
I was also looking at your "Milestone" on your logs and you wanted to
implement HLBVH acceleration structure with the Bounding Volume
Hierarchy to traverse the ray packets. Did you actually implemented this
acceleration structure?
I wrote a Proposal too last year for GSoC that specifically targeted the
Ray Packets coherency traversal as acceleration structures for
performance improvement.
I was also going to ask you about the OpenMP multithreading compiler
support. How does this work? which part of performance improvement were
you targeting with the OpenMP multithreading?
How does OpenCL platform working i.e do you have to install the OpenCL
in your computer in order to run the current Ray Tracing? and is OpenCL
going to be shipped with Brl-cad software?
Thanks.
From,
Benson Chepkwony
On 3/9/2016 4:05 PM, Vasco Alexandre da Silva Costa wrote:
On Wed, Mar 9, 2016 at 4:52 AM, benson chepkwony <bchepk...@att.net
<mailto:bchepk...@att.net>> wrote:
Hi Costa,
I just went through your logs. And its seems on your patch, you
modified Three files; EHY, ELL and ARB8. And in specific you
worked on Elliptical Hyperboloid, Ellipsoid and Polyhedron Algorithms.
Actually I worked on ARB8, ARS, BOT, EHY, ELL, SPH, REC, TOR, TGC.
Is there any work left to do on these Algorithms? or should we
continued optimizing these 'librt/primitives' files that you
worked on?
Each of the primitives has a .cl and a .c file with the primitive
implementation in OpenCL/C. IIRC the only primitive, of those I worked
on, which is not feature complete is BOT (Bag Of Triangles). e.g. BOT
in OpenCL/C does not have plate mode support yet. You could work on
that or on implementing some other relevant primitive like ETO. ETO is
a quartic kinda like TOR and the quartic solver has been ported to
OpenCL already.
You take a look at the BRL-CAD primitives here (I mentioned this
before in this list):
http://brlcad.org/w/images/5/52/MGED_Quick_Reference_Card.pdf
You can submit your work as a patch in unified diff format (e.g. 'diff
-Nurd').
Did you just modified the Algorithms on this specific files or is
this more than just Algorithm modification?
I am sure you did the profiling in the initial stages. And this
should be our starting point but since you have done it, do we
have to profile again? I am sure you had so many files to work
with under 'librt/primitives'.
You should do accuracy tests for each primitive you implement similar
to what I did in Week 10:
http://brlcad.org/wiki/User:Vasco.costa/GSoC15/logs#Weeks_9-10_:_20_Jul-26_Jul.2C_27_Jul-2_Aug
i.e. a pixdiff between the existing ANSI C primitive implementation
and the OpenCL implementation.
At this point performance profiling (e.g. timing tests) should be done
with more complex models than a single primitive. When I started out I
had to reimplement the whole rendering pipeline so some of those tests
are more to test buffer writing performance than actual ray tracing
algorithm performance.
Regards,
-Vasco Costa
From,
Benson Chepkwony
On 3/8/2016 8:55 PM, Vasco Alexandre da Silva Costa wrote:
On Tue, Mar 8, 2016 at 10:35 PM, benson chepkwony
<bchepk...@att.net <mailto:bchepk...@att.net>> wrote:
Hay Costa,
I am interested with this project titled "Ray tracing
performance, coherent boolean evaluation". I understand you
worked on this project last year, that is good. However, I
was wondering if you could further elaborate what you did
with the coherency and which area did your research reside in?
I am not sure about this but since it is a continuation of
your work, I am not sure if we have to apply and use the
coherency Techniques that you applied?
How is the Ray Tracing working out at this point? and what
area need to be further research? Do we need to understand
your code fully to work on this project?
What files in the binary is this project located?
Welcome aboard.
You can see the Blog of my activities last year if you are
interested in what I actually did.
http://brlcad.org/wiki/User:Vasco.costa/GSoC15/logs
Basically what I did was a port of the basic ray tracing pipeline
to an OpenCL GPU environment. This includes numerous supported
primitives. What it doesn't support is boolean evaluation i.e.
CSG (Constructive Solid Geometry) operations. Anyone interested
in working on the OpenCL ray tracer should get familiar with the
BRL-CAD code e.g. by making a patch to add OpenCL acceleration to
an existing primitive like 'eto'.
Afterwards we can look at how the standard BRL-CAD rt pipeline
does CSG ops and how to achieve this in a GPU amenable fashion.
For this I will you give you pointers for where to start reading
the code. But be prepared for some rough sailing. I have a rough
outline of how this can be done but you guys need to get a feel
for it and I want your own opinion on how to do it. I already
have mine. :-)
Read all the e-mail correspondence I have had with Param Hanji
<param.catchch...@gmail.com <mailto:param.catchch...@gmail.com>>
in this list. Since both of you guys seem to be interested in the
same subject:
https://sourceforge.net/p/brlcad/mailman/brlcad-devel/
There is enough work here for two people but we need to figure
out what your strengths are, get you guys to understand the
problems, so you can figure out which approach or which part you
want to work on. What I do not know is how is the workshare
allocation for GSoC this year.
All the best,
-Vasco Costa
Thank you.
From,
Benson Chepkwony
--
Vasco Alexandre da Silva Costa
PhD in Computer Engineering (Computer Graphics)
Instituto Superior Técnico/University of Lisbon, Portugal
--
Vasco Alexandre da Silva Costa
PhD in Computer Engineering (Computer Graphics)
Instituto Superior Técnico/University of Lisbon, Portugal
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