Hi,
I have some geometry that is making use of a VBO. The VBO contains an extremely
large number of vertices. Similarly, I have an element buffer (EBO) that
contains a large amount of indices. I need to render some "objects" that
reference selected vertices of the VBO and selected indices of the EBO,
sequentially, but under different model-view transformations.
Basically, what I am trying to achieve with OSG is the following OpenGL code:
Code:
glBindBuffer(my_huge_vbo)
glBindBuffer(my_huge_ebo)
glLoadMatrix(...); // transformation 1
glDrawElements(GL_TRIANGLES, 10, ........, offset_to_EBO_indices_for_object1);
// draw the first object under transformation 1
glLoadMatrix(...); // transformation 2
glDrawElements(GL_TRIANGLES, 50, ........, offset_to_EBO_indices_for_object2);
// draw the first object under transformation 2
glLoadMatrix(...); // transformation 3
glDrawElements(GL_TRIANGLES, 8, ........, offset_to_EBO_indices_for_object3);
// draw the first object under transformation 3
and so on
My problem is that if I have the following scene graph (see below), I will have
many VBO/EBO buffer bindings, which is what I want to avoid.
Code:
- MatrixTransform
- Geode
- Geometry
- MatrixTransform
- Geode
- Geometry
- MatrixTransform
- Geode
- Geometry
Is there a way to manually assign a VBO and an EBO to a geometry? If this is
the case I could share these across different osg::Geometry object instances.
Regards
Fred
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=47788#47788
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