Hi everyone,
i have a problem concerning volumes (bounding boxes) and distributed
rendering. I have a Node (a flying butterfly) which is animated and
translated through a vertex shader and which i want to display in a
3-sided-cave. The Problem is that, the butterlfy is only renderd on a
specifiic side of the cave when the initial position of the OSGNode is
located an that same side, but since the animation is done through a
vertex shader the butterfly disappears on the other sides while flying
on its circular trajectory. Now i want to change the bounding volume of
the OSGNode, so that it is big enough to display the butterfly on all
sides of the cave it is flying on. I managed to change the volume on a
normal monitor without distribution of the scenegraph, but failed with
distribution. Code looks somewhat like this:
"beginEditCP(butterflynode, Node::CoreFieldMask | Node::ChildrenFieldMask);
butterflynode->setCore(butterflygeo);
butterflynode->addChild(butterflynode2);
butterflynode->addChild(butterflynode3);
endEditCP(butterflynode, Node::CoreFieldMask | Node::ChildrenFieldMask);
beginEditCP(butterflynode, Node::VolumeFieldMask);
DynamicVolume &vol = butterflynode->getVolume(true);
vol.setEmpty();
vol.extendBy(Vec3f(-100,-100,-100));
vol.extendBy(Vec3f(100,100,100));
vol.setValid(true);
vol.setStatic(true);
endEditCP(butterflynode, Node::VolumeFieldMask);"
This works fine on Monitor-Device without distribution, meaning the
bounding volume is changed just fine, but fails with distribution with
the Cave-Device. I also have some problems to understand how the whole
volume stuff works with opensg, especially the getVolume(bool value)
method. But since i managed to change the volume without distribution
i figure i must have done something right. My only guess is, that i
forgot some FieldMaks or begin/edit Tags.
Any quick suggestions on how i can get the volume-change to work with
distribution would be very much welcome, since i have a Presentation on
Friday, for which i want this to work.
Thanks in advance for any suggestions.
Christian Froehlich
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