Mesa 7.3.1 software rasterizer snapping cause holes

[Chen Rabiner]

I'm trying to software render Humus softshadows http://www.humus.name/index.php?page=3D&ID=51
And i'm getting holes in the wood and in other places in the scene.
The holes are created because of triangle snapping with 4 bits of accuracy and this creates gaps in the geomatry, is it possible to increase the SUB_PIXEL_BITS and solve this problem?

[Keith Whitwell-3]

On Thu, 2009-07-09 at 07:19 -0700, Chen Rabiner wrote:
> I'm trying to software render Humus softshadows
> http://www.humus.name/index.php?page=3D&ID=51
> And i'm getting holes in the wood and in other places in the scene.
> The holes are created because of triangle snapping with 4 bits of accuracy
> and this creates gaps in the geomatry, is it possible to increase the
> SUB_PIXEL_BITS and solve this problem?

Holes can be an application issue -- if the app is generating geometry
with T-shaped intersections, then you are at risk of holes no matter how
much precision is applied to the vertices.  

Keith


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[Brian Paul-3]

Chen Rabiner wrote:
> I'm trying to software render Humus softshadows
> http://www.humus.name/index.php?page=3D&ID=51
> And i'm getting holes in the wood and in other places in the scene.
> The holes are created because of triangle snapping with 4 bits of accuracy
> and this creates gaps in the geomatry, is it possible to increase the
> SUB_PIXEL_BITS and solve this problem?

You can try changing it in src/mesa/main/config.h, but as Keith said,
the problem may be elsewhere.

I'd be interested in seeing a screenshot of the problem.

-Brian

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[Chen Rabiner]

I believe that Keith is right, I will be able to send you the screenshot on sunday.

Brian Paul-3 wrote:

Chen Rabiner wrote:
> I'm trying to software render Humus softshadows
> http://www.humus.name/index.php?page=3D&ID=51
> And i'm getting holes in the wood and in other places in the scene.
> The holes are created because of triangle snapping with 4 bits of accuracy
> and this creates gaps in the geomatry, is it possible to increase the
> SUB_PIXEL_BITS and solve this problem?

You can try changing it in src/mesa/main/config.h, but as Keith said,
the problem may be elsewhere.

I'd be interested in seeing a screenshot of the problem.

-Brian

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details at: http://p.sf.net/sfu/Challenge
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