Re: Pre-rendered scene and 3D character movements

[Sam Nova <samnova@datacomm.ch>]

At 14:51 22.09.99 +0100, you wrote:
>Hi
>
>To be honest with you, I do not know. However, I thought about this 
>problem few days ago, and here is my conclusion: the programmer may have 
>replaced the 3D algorthm with a 2D one.
>I mean: knowing the scene, we can define zones on the pre-rendered picture 
>the 3D character will be hidden by. Once its 2D projection interacts with 
>one of these zones, then the intersecting section of the character 
>disappears and the zone is diplayed. We might assimilate this to the 
>painter algorithm with an infinite weight associated with the wall, or 
>whtever needs being renderer on top of the character.
>Still, this is only a guess, and I am not certain I am right.
>Can anybody confirm or contradict this solution ? I might need it in the 
>future.

This would be one way of doing it. Another one would be to store a Z buffer 
from the pre-rendered frames. Then you could just render the 3d Meshes 
using that Z buffer. You might say a Z buffer will use too much space, but 
the accuracy can be reduced and then the buffer can be decompressed.
This way do require a few things:
         The render must be able to use z buffer.
If hardware rendering is used:
         There must be access to the z buffer
         It must be possible to convert the z buffer to the same as the 
hardware. They do use different ones.

Just my idea.

Cheers,
Sam Nova


---------------------------------------------
PC, PlayStation and GameBoy Color programmer.

samnova@datacomm.ch
http://members.xoom.com/SamNova

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