Hi Jie Liu,
Jie Liu wrote:
> Hi,
>
> I read the OpenSG Docs within the v1.8.0 distribution these days, and
> conclude that OpenSG is effective for rendering complex 3D scenes;
Correct.
> But what if I want to write volume rendering program? Volume rendering might
> involve Cg shaders, or can not be organized in a regular scene...
Not sure what you mean here. You can use shaders inside OpenSG, as well as
volumes. We have support for Volume Rendering in OpenSG (in 1.8 two different
versions), and they play reasonably well with the rest of the system.
> Can I control my rendering processes? Or, In other words, can I customize
> the rendering action for a special data set?
Sure. The way to do that is to write anew NodeCore, to do your private
rendering with OpenGL.
> To greater extent, what if I want to write customized OpenGL programs? How
> can I achieve this goal?
Basic OpenGL rendering can be done in a new NodeCore (or a DrawFunctorCore from
Contrib, if need be).
If you want to do current state-of-the-art volume rendering using FBO-rendered
front and back faces and shader-based volume stepping that's a little more
complicated, as OpenSG needs to have control over the steps involved in drawing
the scene and you cannot directly interject your own code.
For that I would recommend using OpenSG 2, as the multi-stage rendering parts
are much better defined than in 1.8 (where essentially all you have is the
FBOViewport).
What exactly are you trying to do?
Yours
Dirk
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