Realtime Ogre 1.8 Terrain Component manipulation

ker · **Posted:** Sat Feb 25, 2012 8:02 pm

nope, if it is end(), then find did not find anything. and then the iterator it is invalid.
using it can corrupt memory and will mess up logic.

ok... I can't understand your triple for loop... but you said the map looks fine I assume your loop is correct.

what do you mean by

drwbns wrote:

my iterator doesn't contain the correct element, why?

is the it->second.position != it->first? or how do you determine that the iterator contains the wrong element?

drwbns · **Joined:** Wed Jan 11, 2012 7:33 pm **Posts:** 109

The problem was the iterator didn't contain any element, but I've fixed that now. I guess you didn't see my last post?

ker · **Posted:** Sat Feb 25, 2012 11:03 pm

nope didn't see it...
you need to render at least a single triangle with dummy information, otherwise ManualObject won't be able to do a beginUpdate...
it's better if you don't create a manualobject for regions with an empty mesh, and only create one when necessary.

drwbns · **Joined:** Wed Jan 11, 2012 7:33 pm **Posts:** 109

ok, I'll try that, thanks ker

drwbns · **Joined:** Wed Jan 11, 2012 7:33 pm **Posts:** 109

Ok, it was in fact that I was trying to create a manualObject with no vertices to start so I added a check to make sure there's voxels created in a region before creating a manualObject and that works beautifully.

Now I need to figure out how to enlarge the LargeVolume on the fly....

ker · **Posted:** Sun Feb 26, 2012 9:25 am

don't set a size for it...
just use it.
it's infinite anyway

when you want an active region, use prefetch for that region.

drwbns · **Joined:** Wed Jan 11, 2012 7:33 pm **Posts:** 109

I'm not sure how you just use it. When I try to set a previousVoxel say (-1,59,44) using volume.setVoxelAt(), it throws an assert...

I added these 2 lines to stop the program crashing -

Code:

         if( raycastResult.previousVoxel.getX() > 0 && raycastResult.previousVoxel.getY() > 0 && raycastResult.previousVoxel.getZ() > 0 )
            if( raycastResult.previousVoxel.getX() < volume.getDepth() && raycastResult.previousVoxel.getY()  < volume.getHeight() && raycastResult.previousVoxel.getZ()  < volume.getWidth() )

ker · **Posted:** Sun Feb 26, 2012 5:45 pm

yes that was stupid from me...

you need to use the constructor that has 2 function pointers and an int...

create two functions... their body does not need to contain anything

Code:

    void dataRequiredHandler(const PolyVox::ConstVolumeProxy<Voxel>&, const PolyVox::Region&)
{}
    void dataOverflowHandler(const PolyVox::ConstVolumeProxy<Voxel>&, const PolyVox::Region&)
{}

construct the volume with the following arguments:

Code:

(&dataRequiredHandler, &dataOverflowHandler, your_wished_chunk_size)

drwbns · **Joined:** Wed Jan 11, 2012 7:33 pm **Posts:** 109

I'm not sure I really understand that but I'll try it, thanks.

I ran into a few errors trying to add the functions and also when initializing the volume. I think I'm supposed to initialize the volume like so ? -

void dataRequiredHandler(const PolyVox::ConstVolumeProxy<Voxel<Density8,PolyVox::MaterialDensityPair44>>&, const PolyVox::Region&)
{}
void dataOverflowHandler(const PolyVox::ConstVolumeProxy<Voxel<Density8,PolyVox::MaterialDensityPair44>>&, const PolyVox::Region&)
{}

PolyVox::LargeVolume<Density8> volume(&dataRequiredHandler, &dataOverflowHandler, your_wished_chunk_size)

ker · **Posted:** Sun Feb 26, 2012 8:52 pm

what is

Code:

Voxel<Density8,PolyVox::MaterialDensityPair44>

?
also, post the errors

I believe you want to replace the "Voxel<Density8,PolyVox::MaterialDensityPair44>" by just "PolyVox::Density8"

yes, the actual constructor looks correct to me (i use it this way in my source)

Realtime Ogre 1.8 Terrain Component manipulation

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