Hello Simon,
Calling the "setVertexArray" every frame, however, brings the frame rate down
dramatically, which isn't very acceptable.
Is there a way to change vertices' positions in real time more effectively?
This is an FAQ. Searching the list archives would have turned up many
threads where this same question was asked.
The OSG by default assumes that your vertex array is static, and
generates display lists for your Drawables. If you update vertex data
each frame, without disabling display lists on that Drawable, then OSG
still thinks that your geometry is static and regenerates the display
list every time you modify the vertex data. This is what is slowing you
down.
Effectively, OSG is generating display lists which are being used for
only one frame and then discarded. Display lists are efficient only when
they can be used for many frames, to offset the time required to
generate them.
Just call geometry->setUseDisplayList(false) when you create the
geometry and you should be fine. Optionally you can enable Vertex Buffer
Objects using geometry->setUseVertexBufferObjects(true). Search the list
or OpenGL documentation to know when this is appropriate.
Hope this helps,
J-S
--
______________________________________________________
Jean-Sebastien Guay jean-sebastien.g...@cm-labs.com
http://www.cm-labs.com/
http://whitestar02.webhop.org/
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