Hi,
When creating globes with VPB one can use the option -v (vertical
multiplier) to set permanent vertical exaggeration for the generated
model. However, in our software solution the user must be able to set
vertical exaggeration from the GUI (i.e. dynamically alter vertical
exaggeration).
What I'd like to know is: What would be a good strategy for implementing
dynamic vertical exaggeration of VPB models?
I am pretty new to OSG, so I would greatly appreciate any suggestions
that could help to start me of in the right direction.
My preliminary gut feeling is that the following strategy could possibly
work:
- Implement a node visitor to find all geode's in model.
- For each geode, traverse each child drawable with an ArrayVisitor.
- In the ArrayVisitor recalculate each vertex based on earth radius from
CoordinateSystemNode/EllipsoidModel, distance from vertex to earth
center, and vertical multiplier.
Is this feasible? Are there any better strategies to follow? Performance
issues/considerations when operation on ~50GB PagedLOD databases.
Any hint and suggestions are very much appreciated. If anyone has
example code that solves similar problems, I would kiss his/her feet in
gratitude:) (not literally though;)
Best regards,
John
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