=== Week 1 report ===<br><br>==this week==<br>*Black dots - bug fix.<br><br>The simplest reproducible bug was: <a href="http://andresp.no-ip.org/soc2009/blackdots.png">http://andresp.no-ip.org/soc2009/blackdots.png</a> <= you can see black dots on edges connecting quads faces<br>
<br>The bug fixed: <a href="http://andresp.no-ip.org/soc2009/blackdots_fix.png">http://andresp.no-ip.org/soc2009/blackdots_fix.png</a> <= this scene previously gave many black dots.<br><br>I still wonder about the bug fix .. as the old code seemed more coeherent with the comments and old code.<br>
<br>I took quite a while to fix the bug.. as there was no selftintersection reported by code, but it was detecting intersections on the inner edge of a quad face.<br>So i discarded many parts of code... after many/many hours.. i found that makeraytree already receives triangles faces, so the bug was probably about edges between faces.<br>
<br>*Link bvhkdop with raytrace<br>was done, it does the same results as octree on simples cases (image diff == 0)<br>But it looks something is wrong on more complex scenes.<br><br>==next week==<br>*See whats wrong with bvh tree<br>
*Do instance support (that means adding a raytrace object that "transforms" between world space and local space).<br><br>==schedule==<br>still ahead of time considering the initial boost (before SoC starts)<br>
<br><br><div class="gmail_quote">2009/5/22 Matt Ebb <span dir="ltr"><<a href="mailto:mattebb@gmail.com">mattebb@gmail.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="im">On Sat, May 23, 2009 at 3:30 AM, André Pinto <<a href="mailto:andresusanopinto@gmail.com">andresusanopinto@gmail.com</a>> wrote:<br>
> Hi,<br>
><br>
> I probably wont be able to be online this sunday meeting.<br>
> Anyway my SoC plans for this first week are:<br>
><br>
> ===comming week===<br>
> *find the bug that makes some black dots.. before I only changed the API<br>
> but it seems some bugs appeared.. I would like to have those sorted out<br>
> before continuing. I already spend some time trying. but its kinda hard to<br>
> debug it.<br>
<br>
</div>What are the black dots? I don't know if it helps or not, or even if<br>
it's the same problem, but i've seen black dots/lines when rendering<br>
volumetrics, and I *think* its an issue in the raytrace code. When<br>
I've had these artifacts, I tried a whole bunch of things to try and<br>
debug - changing the octree size changed the appearance of the dots,<br>
triangulating my mesh helps to clean it up, and poking around in the<br>
code adding a large-ish offset to the ray start location (0.1 or<br>
something) helped too. From memory it happens when the ray fails to<br>
find an intersection, even though it's just being cast along the view<br>
vector with geometry behind. I wasn't able to figure out anything much<br>
more than that.<br>
<br>
Anyway, this may well be a problem in my code, or it may not be what<br>
you're experiencing. If it is the same thing though, it shows its not<br>
just in your code :)<br>
<br>
I think this is an example of the problem here, too:<br>
<a href="http://blenderartists.org/forum/showpost.php?p=1358587&postcount=651" target="_blank">http://blenderartists.org/forum/showpost.php?p=1358587&postcount=651</a><br>
<br>
cheers<br>
<font color="#888888"><br>
Matt<br>
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