BTW, my OpenSG version is 1.8.0
2009/8/7 Jie Liu <[email protected]>
> Hi,
>
> I know this should not be an issue, but I did not find direct examples to
> demonstrate the right way to do blending
>
> OK, here is the thing. I have a quad geometry, my background is solid, say,
> green.
> The color of each vertex of the quad is a Color4f variable, they have the
> same values, like Color4f(1.0, 0.0, 0.0, 0.5)
>
> However, when displaying the scene, the quad is pure red. What could be the
> problem? Will OpenSG blend the scene and the background?
> Or there are additional options to enable blending?
>
> =====================
> BTW, what is the right way to change the values of a GeoColors4f object.
> I checked some tutorial code, the manners to change the value of Nodecore
> objects are very confusing. Below are some examples.
>
> For a GeoTexCoords2f object, we can change its values in this way:
> tex->push_back(tex_value); // this seems the most common way, quite
> intuitive
>
> however, for a GeoTexCoords1fPtr object, in this way:
> tex->*getField().*push_back(tex_value); // we have to get field before we
> push back values, why?
>
> As a constrast, for a GeoColors4f object, We have to do like this
> color->*getFieldPtr()->*push_back(color_value); // this time, we have
> to get the *pointer* of its field before we add values...
>
> So how can I know what is right way to change values of a Nodecore object?
>
> Thanks~~
>
> --
> Jie Liu
> Visualization Research Group
> Center for Information Science, School of EECS,
> Room 2104, Science Building No.2,
> Peking University, Beijing 100871, China
>
>
--
Jie Liu
Visualization Research Group
Center for Information Science, School of EECS,
Room 2104, Science Building No.2,
Peking University, Beijing 100871, China
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