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[Manta] Re: r2304 - in trunk: Engine/PixelSamplers Engine/Renderers Engine/Shadows Interface Model/AmbientLights Model/Instances Model/Materials Model/Primitives Model/Textures


Chronological Thread 
  • From: Li-Ta Lo < >
  • To:
  • Subject: [Manta] Re: r2304 - in trunk: Engine/PixelSamplers Engine/Renderers Engine/Shadows Interface Model/AmbientLights Model/Instances Model/Materials Model/Primitives Model/Textures
  • Date: Thu, 17 Jul 2008 12:06:12 -0600
  • Organization: Los Alamos National Lab
How do you use valgrind with SSE enabled?

Ollie

On Thu, 2008-07-17 at 12:02 -0600, Thiago Ize wrote:

> Log:
> Valgrind was detecting uninitialized values in several places (often
> while path tracing). This can cause or be indicative of weird hard to
> track bugs. For instance, during path tracing, the interpolated
> triangle normals were using the wrong barycentric coordinates. This
> would result in the reflected rays being slightly off. It's a hard
> effect to notice, but it is wrong.
> 

> 
> Model/Materials/Lambertian.cc:
>   -Fixed a bug where sse shading was iterating over the rays and not
>    shadowrays. This results in unintialized data being accesed as well
>    as slower code.
> 
> Model/Primitives/Torus.cc:
>   -Added an assert to require positive radius values.
> 
> Engine/PixelSamplers/JitterSampler.cc:
>   -Need to initialize rng. Otherwise you're using an uninitialized
>    variable.
> 
> Engine/Renderers/KajiyaPathtracer.cc:
>   -Need to swap scratchpads. It's possible other things, such as the
>    scratchpad<char> and other data members also need to be swapped.
> 



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