Hardware buffers & Terrain

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iso
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Hardware buffers & Terrain

Post by iso » Tue Apr 05, 2005 7:00 pm

Hello again, I'm currently modifying the build-in terrain manager (EXTERIOR_CLOSE) for my project (screenshots soon). And now I've come to the point, where I need to implement modifying terrain.

What I've found out yet:
Each "tile" owns a small hardware buffer, that contains the geometry of that tile.
I've found the place, where the geographical information is fed to the buffer.
The buffer gets only deleted, when the app is closed.
The buffer is of course static.

What I want to do:
I have the new (modified) geometry and I want to dispose the old buffer content (and delete it out from the memory) and create a new (again static) buffer with new geometry.

Sooooo how to do that?
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Antiarc
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Post by Antiarc » Tue Apr 05, 2005 7:28 pm

Well, the actual mechanics of doing it should be easy enough to observe from the existing code - you're just going to modify the simple renderable to take new data, and most of the work is done for you.

However, if you're going to be modifying the data, wouldn't a dynamic buffer be more beneficial than recreating static buffers?
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iso
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Post by iso » Tue Apr 05, 2005 7:51 pm

Ok, so I can asume, that Ogre deletes unused buffer itself (a kind of garbage collection). Right???

So that I have just to create a new buffer and set the pointer to the new... Do I understand it right?

Well, updates to the terrain don't occure so often The scene is rendered ~60 fps and the updates happen at most once per second (when the user intensively modifies it). But The length of the game compared to the number of terrain changes... there are to few terrain changes to use dynamic buffers.
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sinbad
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Post by sinbad » Tue Apr 05, 2005 8:25 pm

All hardware buffers use shared pointers so that once the last reference to them goes out of scope, it gets destroyed.
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iso
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Post by iso » Tue Apr 05, 2005 8:30 pm

Great thanx :-)
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