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models hiding other models


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#1 vrdlfe   Members   -  Reputation: 100

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Posted 19 October 2011 - 05:19 AM

I have a problem in which the models I draw keep hiding other models, not in a 3d way but in a sprite kind of way.
Its weird and annoying, is there a way to fix it?



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#2 L. Spiro   Crossbones+   -  Reputation: 13270

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Posted 20 October 2011 - 04:30 AM

A description of the problem or an image would help.
Guessing blindly, I would suggest enabling alpha testing and/or depth testing.


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#3 dAND3h   Members   -  Reputation: 214

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Posted 05 April 2012 - 06:46 PM

Ye, it is probably a depth buffer problem. If you do not enable the depth buffer, things will get drawn in the order which they were added to Components, and NOT on their order in 3d space.

Set
GraphicsDevice.DepthStencilState = DepthStencilState.Default; at the start of your draw method.

#4 Mihai Moldovan   Members   -  Reputation: 127

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Posted 30 April 2012 - 06:52 PM

If it's a depth issue, you may want to look into:

- Painter's Algorithm: Sort from back to front, draw in that order.
- Depth Buffering: Discard pixels that would be behind what's already drawn.

If you want to know how to implement occlusion culling:

- Occlusion Queries (Z-Buffer hierarchy is a good optimization)
- Precomputed PVS and portals




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