[Bf-cycles] BVH White Papers

[Gavin Howard]

Brecht,

Fair enough.

Gavin H.

On Wed, Jun 19, 2013 at 9:29 AM, Brecht Van Lommel
<brechtvanlommel at pandora.be> wrote:
> Hi,
>
> Our implementation is in fact based on the SBVH code from NVidia, same
> as the first paper. We now have some code from Intel too to optimize
> the building and traversal code further, but the overall idea is still
> there. The MSBVH is an interesting optimization to improve the BVH for
> motion blur. That can be looked at once deformation motion blur is
> working.
>
> No rewrite is needed, once you are more familiar with the BVH
> implementation you'll see how these algorithms can be added to the
> existing code. First focus on implementing a "moving triangle"
> primitive in the existing BVH, and once you have deformation motion
> blur working with that you can look at deeper changes to the BVH if
> needed.
>
> Brecht.
>
> On Wed, Jun 19, 2013 at 4:47 PM, Gavin Howard <gavin.d.howard at gmail.com> wrote:
>> Hello all,
>>
>> I have been working on finding the best way to implement the BVH for
>> motion blur in Cycles. I have found two white papers that may have a
>> good answer. The first is just a new way to do BVH's in general. The
>> second is a way to extend the first for motion blur. I have uploaded
>> the pdf's to Dropbox. They are at
>> https://www.dropbox.com/s/y61dsnzhqpw77uz/sbvh.pdf and
>> https://www.dropbox.com/s/4e4q4sqk99popuy/msbvh.pdf.
>>
>> The important thing about doing it this way is that I would have to
>> rewrite Cycles' entire BVH code. Brecht, Stuart, Ton, I would love
>> your thoughts. The advantages I see are the less intersection tests
>> and less traversal, as well as having a way to extend it for motion
>> blur fairly easily. The disadvantage is that I would have to rewrite
>> the BVH building AND traversal code for Cycles.
>>
>> This is just an idea, by the way. I don't really expect that this is
>> what devs want. If it's not, I will find another way.
>>
>> God Bless,
>> Gavin Howard
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