[osg-users] FixedFunctionTechnique, lighting, and createNormalMapTexture

Robert Osfield robert.osfield at gmail.com
Tue May 24 03:12:11 PDT 2016

Hi Alex,

The osgVolume::MultipassTechnique supports mixing geometry with the
volume and constraining to a convex hull geometry.  This is what you
should use instead of FixedFunctionTechnique, the only reason to use
this now is that you've have completely hopeless hardware+drivers that
are incapable of doing proper volume rendering.


On 23 May 2016 at 22:49, Alex Taylor <alextaylor at gmail.com> wrote:
> Hey all,
> From previous posts, I understand clearly that FixedFunctionTechnique is the
> worst of the osgVolume techniques in terms of both speed and quality of
> results.
> However, due to some specific requirements of the application I'm trying to
> build (need for clipping to a bounding box, need to insert other geometry
> into scene) and limitations in the osgViewer in my environment (no support
> for pre-cameras), FixedFunctionTechnique may be something I have to
> consider.
> I was wondering, I understand that createNormalMapTexture is to allow for
> lighting with FixedFunctionTechnique. What does one do with the resulting
> array of normal vectors once you call createNormalMapTexture? Is there an
> interface somewhere to pass the normals? How would one use
> createNormalMapTexture to implement lighting when using
> FixedFunctionTechnique?
> - Alex
> -
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